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Code Issues Releases Activity

Revert Apple hypervisor force ordered memory change (#6068)

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gdkchan 2024-01-13 07:58:09 -03:00 committed by GitHub
parent 7e58b21f3d
commit b16923a902
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2 changed files with 0 additions and 74 deletions
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62
src/Ryujinx.Cpu/AppleHv/HvCodePatcher.cs
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@ -1,62 +0,0 @@
using System;
using System.Runtime.InteropServices;
using System.Runtime.Intrinsics;
namespace Ryujinx.Cpu.AppleHv
{
static class HvCodePatcher
{
private const uint XMask = 0x3f808000u;
private const uint XValue = 0x8000000u;
private const uint ZrIndex = 31u;
public static void RewriteUnorderedExclusiveInstructions(Span<byte> code)
{
Span<uint> codeUint = MemoryMarshal.Cast<byte, uint>(code);
Span<Vector128<uint>> codeVector = MemoryMarshal.Cast<byte, Vector128<uint>>(code);
Vector128<uint> mask = Vector128.Create(XMask);
Vector128<uint> value = Vector128.Create(XValue);
for (int index = 0; index < codeVector.Length; index++)
{
Vector128<uint> v = codeVector[index];
if (Vector128.EqualsAny(Vector128.BitwiseAnd(v, mask), value))
{
int baseIndex = index * 4;
for (int instIndex = baseIndex; instIndex < baseIndex + 4; instIndex++)
{
ref uint inst = ref codeUint[instIndex];
if ((inst & XMask) != XValue)
{
continue;
}
bool isPair = (inst & (1u << 21)) != 0;
bool isLoad = (inst & (1u << 22)) != 0;
uint rt2 = (inst >> 10) & 0x1fu;
uint rs = (inst >> 16) & 0x1fu;
if (isLoad && rs != ZrIndex)
{
continue;
}
if (!isPair && rt2 != ZrIndex)
{
continue;
}
// Set the ordered flag.
inst |= 1u << 15;
}
}
}
}
}
}

12
src/Ryujinx.Cpu/AppleHv/HvMemoryManager.cs
View file

@ -724,18 +724,6 @@ namespace Ryujinx.Cpu.AppleHv
/// <inheritdoc/>
public void Reprotect(ulong va, ulong size, MemoryPermission protection)
{
if (protection.HasFlag(MemoryPermission.Execute))
{
// Some applications use unordered exclusive memory access instructions
// where it is not valid to do so, leading to memory re-ordering that
// makes the code behave incorrectly on some CPUs.
// To work around this, we force all such accesses to be ordered.
using WritableRegion writableRegion = GetWritableRegion(va, (int)size);
HvCodePatcher.RewriteUnorderedExclusiveInstructions(writableRegion.Memory.Span);
}
// TODO
}