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Move partial unmap handler to the native signal handler (#3437)

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* Initial commit with a lot of testing stuff.

* Partial Unmap Cleanup Part 1

* Fix some minor issues, hopefully windows tests.

* Disable partial unmap tests on macos for now

Weird issue.

* Goodbye magic number

* Add COMPlus_EnableAlternateStackCheck for tests

`COMPlus_EnableAlternateStackCheck` is needed for NullReferenceException handling to work on linux after registering the signal handler, due to how dotnet registers its own signal handler.

* Address some feedback

* Force retry when memory is mapped in memory tracking

This case existed before, but returning `false` no longer retries, so it would crash immediately after unprotecting the memory... Now, we return `true` to deliberately retry.

This case existed before (was just broken by this change) and I don't really want to look into fixing the issue right now. Technically, this means that on guest code partial unmaps will retry _due to this_ rather than hitting the handler. I don't expect this to cause any issues.

This should fix random crashes in Xenoblade Chronicles 2.

* Use IsRangeMapped

* Suppress MockMemoryManager.UnmapEvent warning

This event is not signalled by the mock memory manager.

* Remove 4kb mapping
This commit is contained in:
riperiperi 2022-07-30 00:16:29 +02:00 • committed by GitHub
parent 952d013c67
commit 14ce9e1567
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24 changed files with 1355 additions and 391 deletions
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21
ARMeilleure/Signal/NativeSignalHandler.cs
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@ -197,12 +197,29 @@ namespace ARMeilleure.Signal
// Only call tracking if in range.
context.BranchIfFalse(nextLabel, inRange, BasicBlockFrequency.Cold);
context.Copy(inRegionLocal, Const(1));
Operand offset = context.BitwiseAnd(context.Subtract(faultAddress, rangeAddress), Const(~PageMask));
// Call the tracking action, with the pointer's relative offset to the base address.
Operand trackingActionPtr = context.Load(OperandType.I64, Const((ulong)signalStructPtr + rangeBaseOffset + 20));
context.Call(trackingActionPtr, OperandType.I32, offset, Const(PageSize), isWrite, Const(0));
context.Copy(inRegionLocal, Const(0));
Operand skipActionLabel = Label();
// Tracking action should be non-null to call it, otherwise assume false return.
context.BranchIfFalse(skipActionLabel, trackingActionPtr);
Operand result = context.Call(trackingActionPtr, OperandType.I32, offset, Const(PageSize), isWrite, Const(0));
context.Copy(inRegionLocal, result);
context.MarkLabel(skipActionLabel);
// If the tracking action returns false or does not exist, it might be an invalid access due to a partial overlap on Windows.
if (OperatingSystem.IsWindows())
{
context.BranchIfTrue(endLabel, inRegionLocal);
context.Copy(inRegionLocal, WindowsPartialUnmapHandler.EmitRetryFromAccessViolation(context));
}
context.Branch(endLabel);