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using ARMeilleure.Memory;
using System;
using System.Runtime.InteropServices;
namespace ARMeilleure.Translation.Cache
{
class JitCacheInvalidation
{
private static int[] _invalidationCode = new int[]
{
unchecked((int)0xd53b0022), // mrs x2, ctr_el0
unchecked((int)0xd3504c44), // ubfx x4, x2, #16, #4
unchecked((int)0x52800083), // mov w3, #0x4
unchecked((int)0x12000c45), // and w5, w2, #0xf
unchecked((int)0x1ac42064), // lsl w4, w3, w4
unchecked((int)0x51000482), // sub w2, w4, #0x1
unchecked((int)0x8a220002), // bic x2, x0, x2
unchecked((int)0x1ac52063), // lsl w3, w3, w5
unchecked((int)0xeb01005f), // cmp x2, x1
unchecked((int)0x93407c84), // sxtw x4, w4
unchecked((int)0x540000a2), // b.cs 3c <do_ic_clear>
unchecked((int)0xd50b7b22), // dc cvau, x2
unchecked((int)0x8b040042), // add x2, x2, x4
unchecked((int)0xeb02003f), // cmp x1, x2
unchecked((int)0x54ffffa8), // b.hi 2c <dc_clear_loop>
unchecked((int)0xd5033b9f), // dsb ish
unchecked((int)0x51000462), // sub w2, w3, #0x1
unchecked((int)0x93407c63), // sxtw x3, w3
unchecked((int)0x8a220000), // bic x0, x0, x2
unchecked((int)0xeb00003f), // cmp x1, x0
unchecked((int)0x540000a9), // b.ls 64 <exit>
unchecked((int)0xd50b7520), // ic ivau, x0
unchecked((int)0x8b030000), // add x0, x0, x3
unchecked((int)0xeb00003f), // cmp x1, x0
unchecked((int)0x54ffffa8), // b.hi 54 <ic_clear_loop>
unchecked((int)0xd5033b9f), // dsb ish
unchecked((int)0xd5033fdf), // isb
unchecked((int)0xd65f03c0), // ret
};
private delegate void InvalidateCache(ulong start, ulong end);
private InvalidateCache _invalidateCache;
private ReservedRegion _invalidateCacheCodeRegion;
private readonly bool _needsInvalidation;
public JitCacheInvalidation(IJitMemoryAllocator allocator)
{
// On macOS and Windows, a different path is used to write to the JIT cache, which does the invalidation.
if (RuntimeInformation.ProcessArchitecture == Architecture.Arm64)
{
ulong size = (ulong)_invalidationCode.Length * sizeof(int);
ulong mask = (ulong)ReservedRegion.DefaultGranularity - 1;
size = (size + mask) & ~mask;
_invalidateCacheCodeRegion = new ReservedRegion(allocator, size);
_invalidateCacheCodeRegion.ExpandIfNeeded(size);
Marshal.Copy(_invalidationCode, 0, _invalidateCacheCodeRegion.Pointer, _invalidationCode.Length);
_invalidateCacheCodeRegion.Block.MapAsRx(0, size);
_invalidateCache = Marshal.GetDelegateForFunctionPointer<InvalidateCache>(_invalidateCacheCodeRegion.Pointer);
_needsInvalidation = true;
}
}
public void Invalidate(IntPtr basePointer, ulong size)
{
if (_needsInvalidation)
{
_invalidateCache((ulong)basePointer, (ulong)basePointer + size);
}
}
}
}
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