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547 lines
17 KiB
Swift
547 lines
17 KiB
Swift
//
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// WDC65816AddressingTests.swift
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// Clock Signal
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//
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// Created by Thomas Harte on 13/10/2020.
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// Copyright 2020 Thomas Harte. All rights reserved.
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//
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import Foundation
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import XCTest
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// This exactly transcribes the examples given in http://6502.org/tutorials/65c816opcodes.html#5
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// Quoted text is taken verbatim from that document.
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class WDC65816AddressingTests: XCTestCase {
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// MARK: - Test Machines
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/// Returns a CSTestMachine6502 that is currently configured in native mode with 16-bit memory and index registers.
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private func machine16() -> CSTestMachine6502 {
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let machine = CSTestMachine6502(processor: .processor65816)
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machine.setValue(0, for: .emulationFlag)
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machine.setValue(0, for: .flags)
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return machine
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}
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/// Returns a CSTestMachine6502 that is currently configured in emulation mode.
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private func machine8() -> CSTestMachine6502 {
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return CSTestMachine6502(processor: .processor65816)
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}
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// MARK: - Tests
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func testAbsoluteJMP() {
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// "If the K register is $12, then JMP $FFFF jumps to $12FFFF"
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let machine = machine16()
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machine.setValue(0x12, for: .programBank)
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// JMP $ffff
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machine.setData(Data([0x4c, 0xff, 0xff]), atAddress: 0x120200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 4)
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XCTAssertEqual(machine.value(for: .programCounter), 0) // i.e. 0xffff + 1
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XCTAssertEqual(machine.value(for: .programBank), 0x12)
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}
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func testAbsolute() {
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// "If the DBR is $12 and the m flag is 0, then LDA $FFFF loads the low byte of
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// the data from address $12FFFF, and the high byte from address $130000"
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let machine = machine16()
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machine.setValue(0x12, for: .dataBank)
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machine.setValue(0xab, forAddress: 0x12ffff)
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machine.setValue(0xcd, forAddress: 0x130000)
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// LDA $ffff; NOP
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machine.setData(Data([0xad, 0xff, 0xff, 0xea]), atAddress: 0x200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 6)
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XCTAssertEqual(machine.value(for: .A), 0xcdab)
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}
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func testAbsoluteX() {
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// "If the DBR is $12, the X register is $000A, and the m flag is 0, then
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// LDA $FFFE,X loads the low byte of the data from address $130008, and
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// the high byte from address $130009"
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//
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// "Note that this is one of the rare instances where emulation mode has
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// different behavior than the 65C02 or NMOS 6502 ..."
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let machine = machine16()
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machine.setValue(0x12, for: .dataBank)
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machine.setValue(0x0a, for: .X)
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machine.setValue(0xab, forAddress: 0x130008)
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machine.setValue(0xcd, forAddress: 0x130009)
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// LDA $fffe, x; NOP
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machine.setData(Data([0xbd, 0xfe, 0xff, 0xea]), atAddress: 0x200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 7)
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XCTAssertEqual(machine.value(for: .A), 0xcdab)
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}
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func testJMPAbsoluteIndirect() {
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// "If the K register is $12 and
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// * $000000 contains $34
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// * $00FFFF contains $56
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// then JMP ($FFFF) jumps to $123456"
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let machine = machine16()
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machine.setValue(0x12, for: .programBank)
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machine.setValue(0x0a, for: .X)
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machine.setValue(0x34, forAddress: 0x0000)
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machine.setValue(0x56, forAddress: 0xffff)
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// JMP ($ffff); NOP
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machine.setData(Data([0x6c, 0xff, 0xff, 0xea]), atAddress: 0x120200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 6)
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XCTAssertEqual(machine.value(for: .programCounter), 0x3456 + 1)
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XCTAssertEqual(machine.value(for: .programBank), 0x12)
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}
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func testIndirectAbsoluteX() {
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// "If the K register is $12, the X register is $000A, and
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// * $120008 contains $56
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// * $120009 contains $34
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//then JMP ($FFFE,X) jumps to $123456"
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let machine = machine16()
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machine.setValue(0x12, for: .programBank)
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machine.setValue(0x0a, for: .X)
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machine.setValue(0x56, forAddress: 0x120008)
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machine.setValue(0x34, forAddress: 0x120009)
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// JMP ($fffe, x); NOP
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machine.setData(Data([0x7c, 0xfe, 0xff, 0xea]), atAddress: 0x120200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 7)
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XCTAssertEqual(machine.value(for: .programCounter), 0x3456 + 1)
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XCTAssertEqual(machine.value(for: .programBank), 0x12)
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}
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func testDirect8() {
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// "If the D register is $FF00 and the e flag is 1 (note that
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// this means the m flag must be 1), then LDA $FF loads the low
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// byte of the data from address $00FFFF"
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let machine = machine8()
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machine.setValue(0xff00, for: .direct)
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machine.setValue(0xab, forAddress: 0xffff)
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// LDA $ff; NOP
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machine.setData(Data([0xa5, 0xff, 0xea]), atAddress: 0x0200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 4)
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XCTAssertEqual(machine.value(for: .A), 0xab)
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}
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func testDirect16() {
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// "If the D register is $FF00 and the m flag is 0 (note that
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// this means the e flag must be 0), then LDA $FF loads the low
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// byte of the data from address $00FFFF, and the high byte
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// from address $000000"
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let machine = machine16()
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machine.setValue(0xff00, for: .direct)
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machine.setValue(0xab, forAddress: 0xffff)
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machine.setValue(0xcd, forAddress: 0x0000)
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// LDA $ff; NOP
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machine.setData(Data([0xa5, 0xff, 0xea]), atAddress: 0x0200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 5)
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XCTAssertEqual(machine.value(for: .A), 0xcdab)
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}
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func testDirextX8() {
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// "If the D register is $FF00, the X register is $000A, and
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// the e flag is 1 (note that this means the m flag must be 1),
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// then LDA $FE,X loads the low byte of the data from
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// address $00FF08"
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let machine = machine8()
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machine.setValue(0xff00, for: .direct)
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machine.setValue(0x000a, for: .X)
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machine.setValue(0xab, forAddress: 0xff08)
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// LDA $fe, X; NOP
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machine.setData(Data([0xb5, 0xfe, 0xea]), atAddress: 0x0200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 5)
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XCTAssertEqual(machine.value(for: .A), 0xab)
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}
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func testDirectX16() {
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// "If the D register is $FF00, the X register is $000A, and the
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// m flag is 0 (note that this means the e flag must be 0), then
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// LDA $FE,X loads the low byte of the data from address $000008,
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// and the high byte from address $000009"
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let machine = machine16()
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machine.setValue(0xff00, for: .direct)
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machine.setValue(0x000a, for: .X)
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machine.setValue(0xab, forAddress: 0x0008)
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machine.setValue(0xcd, forAddress: 0x0009)
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// LDA $fe, X; NOP
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machine.setData(Data([0xb5, 0xfe, 0xea]), atAddress: 0x0200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 6)
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XCTAssertEqual(machine.value(for: .A), 0xcdab)
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}
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func testDirectIndirect8() {
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// "If the D register is $FF00 and the e flag is 1 (note this means the
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// m flag must be 1), then for LDA ($FF), the address of the low byte of
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// the pointer is $00FFFF and the address of the high byte is $00FF00.
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// Furthermore, if the DBR is $12 and
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// * $00FF00 contains $FF
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// * $00FFFF contains $FF
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// then LDA ($FF) loads the low byte of the data from address $12FFFF."
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let machine = machine8()
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machine.setValue(0xff00, for: .direct)
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machine.setValue(0x12, for: .dataBank)
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machine.setValue(0xff, forAddress: 0xff00)
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machine.setValue(0xff, forAddress: 0xffff)
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machine.setValue(0xab, forAddress: 0x12ffff)
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// LDA ($ff); NOP
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machine.setData(Data([0xb2, 0xff, 0xea]), atAddress: 0x0200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 6)
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XCTAssertEqual(machine.value(for: .A), 0xab)
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}
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func testDirectIndirect16() {
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// "If the D register is $FF00 and the m flag is 0 (note this means the e
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// flag must be 0), then for LDA ($FF), the address of the low byte of the
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// pointer is $00FFFF and the address of the high byte is $000000.
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// Furthermore, if the DBR is $12 and
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// * $000000 contains $FF
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// * $00FFFF contains $FF
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// then LDA ($FF) loads the low byte of the data from address $12FFFF, and
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// the high byte from $130000."
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let machine = machine16()
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machine.setValue(0xff00, for: .direct)
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machine.setValue(0x12, for: .dataBank)
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machine.setValue(0xff, forAddress: 0x0000)
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machine.setValue(0xff, forAddress: 0xffff)
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machine.setValue(0xab, forAddress: 0x12ffff)
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machine.setValue(0xcd, forAddress: 0x130000)
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// LDA ($ff); NOP
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machine.setData(Data([0xb2, 0xff, 0xea]), atAddress: 0x0200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 7)
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XCTAssertEqual(machine.value(for: .A), 0xcdab)
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}
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func testDirectIndirectLong() {
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// "If the D register is $FF00 and the m flag is 0, then for LDA [$FE], the
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// address of the low byte of the pointer is $00FFFE, the address of the middle
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// byte is $00FFFF, and the address of the high byte is $000000. Furthermore, if
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// * $000000 contains $12
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// * $00FFFE contains $FF
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// * $00FFFF contains $FF
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// then LDA [$FE] loads the low byte of the data from address $12FFFF, and the
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// high byte from $130000."
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let machine = machine16()
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machine.setValue(0xff00, for: .direct)
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machine.setValue(0x12, forAddress: 0x0000)
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machine.setValue(0xff, forAddress: 0xfffe)
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machine.setValue(0xff, forAddress: 0xffff)
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machine.setValue(0xab, forAddress: 0x12ffff)
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machine.setValue(0xcd, forAddress: 0x130000)
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// LDA [$fe]; NOP
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machine.setData(Data([0xa7, 0xfe, 0xea]), atAddress: 0x0200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 8)
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XCTAssertEqual(machine.value(for: .A), 0xcdab)
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}
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func testDirectXIndirectX8() {
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// "If the D register is $FF00, the X register is $000A, and the e flag is 1 (note
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// that this means the m flag must be 1), then for LDA ($FE,X), the address of the
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// low byte of the pointer is $00FF08 and the address of the high byte is $00FF09.
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// Furthermore, if the DBR is $12 and
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// * $00FF08 contains $FF
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// * $00FF09 contains $FF
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// then LDA ($FE,X) loads the low byte of the data from address $12FFFF."
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let machine = machine8()
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machine.setValue(0xff00, for: .direct)
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machine.setValue(0x000a, for: .X)
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machine.setValue(0x12, for: .dataBank)
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machine.setValue(0xff, forAddress: 0xff08)
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machine.setValue(0xff, forAddress: 0xff09)
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machine.setValue(0xab, forAddress: 0x12ffff)
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// LDA ($fe, x); NOP
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machine.setData(Data([0xa1, 0xfe, 0xea]), atAddress: 0x0200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 7)
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XCTAssertEqual(machine.value(for: .A), 0xab)
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}
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func testDirectXIndirect16() {
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// "If the D register is $FF00, the X register is $000A, and the m flag is 0
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// (note that this means the e flag must be 0), then for LDA ($FE,X), the address
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// of the low byte of the pointer is $000008 and the address of the high byte
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// is $000009. Furthermore, if the DBR is $12 and
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// * $000008 contains $FF
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// * $000009 contains $FF
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// then LDA ($FE,X) loads the low byte of the data from address $12FFFF, and the
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// high byte from $130000."
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let machine = machine16()
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machine.setValue(0xff00, for: .direct)
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machine.setValue(0x000a, for: .X)
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machine.setValue(0x12, for: .dataBank)
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machine.setValue(0xff, forAddress: 0x0008)
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machine.setValue(0xff, forAddress: 0x0009)
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machine.setValue(0xab, forAddress: 0x12ffff)
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machine.setValue(0xcd, forAddress: 0x130000)
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// LDA ($fe, x); NOP
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machine.setData(Data([0xa1, 0xfe, 0xea]), atAddress: 0x0200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 8)
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XCTAssertEqual(machine.value(for: .A), 0xcdab)
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}
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func testIndirectY8() {
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// "If the D register is $FF00 and the e flag is 1 (note that this means the
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// m flag must be 1), then for LDA ($FF),Y, the address of the low byte of the
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// pointer is $00FFFF and the address of the high byte is $00FF00.
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// Furthermore, if the DBR is $12, the Y register is $000A, and
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// * $00FF00 contains $FF
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// * $00FFFF contains $FE
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// then LDA ($FF),Y loads the low byte of the data from address $130008."
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//
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// "this is one of the rare instances where emulation mode has
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// different behavior than the 65C02 or NMOS 6502..."
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let machine = machine8()
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machine.setValue(0xff00, for: .direct)
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machine.setValue(0x000a, for: .Y)
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machine.setValue(0x12, for: .dataBank)
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machine.setValue(0xff, forAddress: 0xff00)
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machine.setValue(0xfe, forAddress: 0xffff)
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machine.setValue(0xab, forAddress: 0x130008)
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// LDA ($ff), y; NOP
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machine.setData(Data([0xb1, 0xff, 0xea]), atAddress: 0x0200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 7)
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XCTAssertEqual(machine.value(for: .A), 0xab)
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}
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func testIndirectY16() {
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// "If the D register is $FF00 and the m flag is 0 (note that this means the
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// e flag must be 0), then for LDA ($FF),Y, the address of the low byte of the
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// pointer is $00FFFF and the address of the high byte is $000000.
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// Furthermore, if the DBR is $12, the Y register is $000A, and
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// * $000000 contains $FF
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// * $00FFFF contains $FE
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// then LDA ($FF),Y loads the low byte of the data from address $130008, and the
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// high byte from $130009."
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let machine = machine16()
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machine.setValue(0xff00, for: .direct)
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machine.setValue(0x000a, for: .Y)
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machine.setValue(0x12, for: .dataBank)
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machine.setValue(0xff, forAddress: 0x0000)
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machine.setValue(0xfe, forAddress: 0xffff)
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machine.setValue(0xab, forAddress: 0x130008)
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machine.setValue(0xcd, forAddress: 0x130009)
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// LDA ($ff), y; NOP
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machine.setData(Data([0xb1, 0xff, 0xea]), atAddress: 0x0200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 8)
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XCTAssertEqual(machine.value(for: .A), 0xcdab)
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}
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func testIndirectYLong() {
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// "If the D register is $FF00 and the m flag is 0, then for LDA [$FE],Y, the address
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// of the low byte of the pointer is $00FFFE, the address of the middle byte is $00FFFF,
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// and the address of the high byte is $000000. Furthermore, if the Y register is $000A, and
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// * $000000 contains $12
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// * $00FFFE contains $FC
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// * $00FFFF contains $FF
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// then LDA [$FE],Y loads the low byte of the data from address $130006, and the high byte
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// from $130007."
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let machine = machine16()
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machine.setValue(0xff00, for: .direct)
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machine.setValue(0x000a, for: .Y)
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machine.setValue(0x12, for: .dataBank)
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machine.setValue(0x12, forAddress: 0x0000)
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machine.setValue(0xfc, forAddress: 0xfffe)
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machine.setValue(0xff, forAddress: 0xffff)
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machine.setValue(0xab, forAddress: 0x130006)
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machine.setValue(0xcd, forAddress: 0x130007)
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// LDA [$fe], y; NOP
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machine.setData(Data([0xb7, 0xfe, 0xea]), atAddress: 0x0200)
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 8)
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XCTAssertEqual(machine.value(for: .A), 0xcdab)
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}
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func testAbsoluteLong() {
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// "If the m flag is 0, then LDA $12FFFF loads the low byte of the data from address $12FFFF,
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// and the high byte from address $130000."
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let machine = machine16()
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machine.setValue(0xab, forAddress: 0x12ffff)
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machine.setValue(0xcd, forAddress: 0x130000)
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// LDA $12ffff; NOP
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machine.setData(Data([0xaf, 0xff, 0xff, 0x12, 0xea]), atAddress: 0x0200)
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|
|
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machine.setValue(0x200, for: .programCounter)
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machine.runForNumber(ofCycles: 7)
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|
|
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XCTAssertEqual(machine.value(for: .A), 0xcdab)
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|
}
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|
|
|
func testAbsoluteLongX() {
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// "If the X register is $000A and the m flag is 0, then LDA $12FFFE,X loads the low byte of
|
|
// the data from address $130008, and the high byte from address $130009."
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|
let machine = machine16()
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|
|
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machine.setValue(0x000a, for: .X)
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|
|
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machine.setValue(0xab, forAddress: 0x130008)
|
|
machine.setValue(0xcd, forAddress: 0x130009)
|
|
|
|
// LDA $12fffe, x; NOP
|
|
machine.setData(Data([0xbf, 0xfe, 0xff, 0x12, 0xea]), atAddress: 0x0200)
|
|
|
|
machine.setValue(0x200, for: .programCounter)
|
|
machine.runForNumber(ofCycles: 7)
|
|
|
|
XCTAssertEqual(machine.value(for: .A), 0xcdab)
|
|
}
|
|
|
|
func testStackS() {
|
|
// "If the S register is $FF10 and the m flag is 0, then LDA $FA,S loads the low byte
|
|
// of the data from address $00000A, and the high byte from address $00000B."
|
|
let machine = machine16()
|
|
|
|
machine.setValue(0xff10, for: .stackPointer)
|
|
|
|
machine.setValue(0xab, forAddress: 0x000a)
|
|
machine.setValue(0xcd, forAddress: 0x000b)
|
|
|
|
// LDA $fa, s; NOP
|
|
machine.setData(Data([0xa3, 0xfa, 0xea]), atAddress: 0x0200)
|
|
|
|
machine.setValue(0x200, for: .programCounter)
|
|
machine.runForNumber(ofCycles: 7)
|
|
|
|
XCTAssertEqual(machine.value(for: .A), 0xcdab)
|
|
}
|
|
|
|
func testIndirectStackSY() {
|
|
// "If the S register is $FF10 and the m flag is 0, then for LDA ($FA,S),Y, the address
|
|
// of the low byte of the pointer is $00000A and the address of the high byte is $00000B.
|
|
// Furthermore, if the DBR is $12, the Y register is $0050, and
|
|
// * $00000A contains $F0
|
|
// * $00000B contains $FF
|
|
// then LDA ($FA,S),Y loads the low byte of the data from address $130040, and the high
|
|
// byte from $130041."
|
|
let machine = machine16()
|
|
|
|
machine.setValue(0xff10, for: .stackPointer)
|
|
machine.setValue(0x0050, for: .Y)
|
|
machine.setValue(0x12, for: .dataBank)
|
|
|
|
machine.setValue(0xf0, forAddress: 0x000a)
|
|
machine.setValue(0xff, forAddress: 0x000b)
|
|
|
|
machine.setValue(0xab, forAddress: 0x130040)
|
|
machine.setValue(0xcd, forAddress: 0x130041)
|
|
|
|
// LDA ($fa, s), y; NOP
|
|
machine.setData(Data([0xb3, 0xfa, 0xea]), atAddress: 0x0200)
|
|
|
|
machine.setValue(0x200, for: .programCounter)
|
|
machine.runForNumber(ofCycles: 9)
|
|
|
|
XCTAssertEqual(machine.value(for: .A), 0xcdab)
|
|
}
|
|
|
|
}
|