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Force all exclusive memory accesses to be ordered on AppleHv (#5898)

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* Implement reprotect method on virtual memory manager (currently stubbed)

* Force all exclusive memory accesses to be ordered on AppleHv

* Format whitespace

* Fix test build

* Fix comment copy/paste

* Fix wrong bit for isLoad

* Update src/Ryujinx.Cpu/AppleHv/HvMemoryManager.cs

Co-authored-by: riperiperi <rhy3756547@hotmail.com>

---------

Co-authored-by: riperiperi <rhy3756547@hotmail.com>
This commit is contained in:
gdkchan
2023-11-07 13:24:10 -03:00
committed by GitHub
parent 623604c391
commit 815819767c
11 changed files with 171 additions and 59 deletions
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62
src/Ryujinx.Cpu/AppleHv/HvCodePatcher.cs Normal file
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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;
}
}
}
}
}
}