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Completes 65816 addressing mode tests and corresponding fixes.

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This commit is contained in:
Thomas Harte 2020-10-14 22:00:52 -04:00
parent e511d33a7c
commit 3c6adc1ff4
3 changed files with 64 additions and 5 deletions
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65
OSBindings/Mac/Clock SignalTests/65816AddressingTests.swift
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@ -459,21 +459,59 @@ class WDC65816AddressingTests: XCTestCase {
XCTAssertEqual(machine.value(for: .A), 0xcdab)
}
// TODO: all tests from this point downward.
func testLong() {
func testAbsoluteLong() {
// "If the m flag is 0, then LDA $12FFFF loads the low byte of the data from address $12FFFF,
// and the high byte from address $130000."
let machine = machine16()
machine.setValue(0xab, forAddress: 0x12ffff)
machine.setValue(0xcd, forAddress: 0x130000)
// LDA $12ffff; NOP
machine.setData(Data([0xaf, 0xff, 0xff, 0x12, 0xea]), atAddress: 0x0200)
machine.setValue(0x200, for: .programCounter)
machine.runForNumber(ofCycles: 7)
XCTAssertEqual(machine.value(for: .A), 0xcdab)
}
func testLongX() {
func testAbsoluteLongX() {
// "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."
let machine = machine16()
machine.setValue(0x000a, for: .X)
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() {
@ -484,5 +522,24 @@ class WDC65816AddressingTests: XCTestCase {
// * $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)
}
}

3
Processors/65816/Implementation/65816Implementation.hpp
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@ -360,8 +360,9 @@ template <typename BusHandler> void Processor<BusHandler>::run_for(const Cycles
continue;
case OperationConstructStackRelativeIndexedIndirect:
data_address_ = (instruction_buffer_.value + y()) & 0xffff;
data_address_ = data_bank_ + data_buffer_.value + y();
data_address_increment_mask_ = 0xff'ff'ff;
data_buffer_.clear();
continue;
case OperationConstructPER:

1
Processors/65816/Implementation/65816Storage.hpp
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@ -325,6 +325,7 @@ struct ProcessorStorage {
private:
uint8_t *byte(int pointer) {
assert(pointer >= 0 && pointer < 4);
#if TARGET_RT_BIG_ENDIAN
return reinterpret_cast<uint8_t *>(&value) + (3 ^ pointer);
#else