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Check for reads/writes outside of the address space, optimize translation with a tail call

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This commit is contained in:
gdkchan 2018-08-15 14:56:08 -03:00
parent 7685062655
commit b4f3ffad61
1 changed files with 28 additions and 12 deletions
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40
ChocolArm64/Memory/AMemory.cs
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@ -43,18 +43,20 @@ namespace ChocolArm64.Memory
private Dictionary<int, ArmMonitor> Monitors;
private ConcurrentDictionary<long, IntPtr> ObservedPages;
public IntPtr Ram { get; private set; }
private byte* RamPtr;
private byte*** PageTable;
private ConcurrentDictionary<long, IntPtr> ObservedPages;
public AMemory(IntPtr Ram)
{
Monitors = new Dictionary<int, ArmMonitor>();
ObservedPages = new ConcurrentDictionary<long, IntPtr>();
this.Ram = Ram;
RamPtr = (byte*)Ram;
@ -65,8 +67,6 @@ namespace ChocolArm64.Memory
{
PageTable[L0] = null;
}
ObservedPages = new ConcurrentDictionary<long, IntPtr>();
}
public void RemoveMonitor(AThreadState State)
@ -445,25 +445,33 @@ namespace ChocolArm64.Memory
long L0 = (Position >> PTLvl0Bit) & PTLvl0Mask;
long L1 = (Position >> PTLvl1Bit) & PTLvl1Mask;
long Old = Position;
byte** Lvl1 = PageTable[L0];
if ((Position >> (PTLvl0Bit + PTLvl0Bits)) != 0)
{
goto Unmapped;
}
if (Lvl1 == null)
{
return HandleNullPte(Position);
goto Unmapped;
}
long Old = Position;
Position &= PageMask;
byte* Ptr = Lvl1[L1];
if (Ptr == null)
{
return HandleNullPte(Old);
goto Unmapped;
}
return Ptr + Position;
Unmapped:
return HandleNullPte(Old);
}
private byte* HandleNullPte(long Position)
@ -483,25 +491,33 @@ namespace ChocolArm64.Memory
long L0 = (Position >> PTLvl0Bit) & PTLvl0Mask;
long L1 = (Position >> PTLvl1Bit) & PTLvl1Mask;
long Old = Position;
byte** Lvl1 = PageTable[L0];
if ((Position >> (PTLvl0Bit + PTLvl0Bits)) != 0)
{
goto Unmapped;
}
if (Lvl1 == null)
{
return HandleNullPteWrite(Position);
goto Unmapped;
}
long Old = Position;
Position &= PageMask;
byte* Ptr = Lvl1[L1];
if (Ptr == null)
{
return HandleNullPteWrite(Old);
goto Unmapped;
}
return Ptr + Position;
Unmapped:
return HandleNullPteWrite(Old);
}
private byte* HandleNullPteWrite(long Position)