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Fix LINK A7.

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This commit is contained in:
Thomas Harte 2022-05-23 10:43:17 -04:00
parent 98325325b1
commit a87f6a28c9
2 changed files with 15 additions and 3 deletions
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2
OSBindings/Mac/Clock SignalTests/68000ComparativeTests.mm
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@ -156,7 +156,7 @@ struct TestProcessor: public CPU::MC68000Mk2::BusHandler {
// To limit tests run to a subset of files and/or of tests, uncomment and fill in below.
// _fileSet = [NSSet setWithArray:@[@"abcd_sbcd.json"]];
// _testSet = [NSSet setWithArray:@[@"UNLK 0007"]];
// _testSet = [NSSet setWithArray:@[@"LINK.w 0007"]];
}
- (void)testAll {

16
Processors/68000Mk2/Implementation/68000Mk2Implementation.hpp
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@ -2120,8 +2120,20 @@ void Processor<BusHandler, dtack_is_implicit, permit_overrun, signal_will_perfor
//
BeginState(LINK):
Prefetch();
Push(registers_[8 + instruction_.reg(0)]);
registers_[8 + instruction_.reg(0)].l = registers_[15].l + uint32_t(int16_t(prefetch_.high.w));
// Ensure that the stack pointer is [seemingly] captured after
// having been decremented by four, if it's what should be captured.
registers_[15].l -= 4;
temporary_address_ = registers_[8 + instruction_.reg(0)];
registers_[15].l += 4;
// Push will actually decrement the stack pointer.
Push(temporary_address_);
// Make the exchange.
registers_[8 + instruction_.reg(0)].l = registers_[15].l;
registers_[15].l += uint32_t(int16_t(prefetch_.high.w));
Prefetch();
MoveToStateSpecific(Decode);