Ryujinx/ARMeilleure/CodeGen/Arm64/CallingConvention.cs

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using System;
namespace ARMeilleure.CodeGen.Arm64
{
static class CallingConvention
{
private const int RegistersMask = unchecked((int)0xffffffff);
// Some of those register have specific roles and can't be used as general purpose registers.
// X18 - Reserved for platform specific usage.
// X29 - Frame pointer.
// X30 - Return address.
// X31 - Not an actual register, in some cases maps to SP, and in others to ZR.
private const int ReservedRegsMask = (1 << CodeGenCommon.ReservedRegister) | (1 << 18) | (1 << 29) | (1 << 30) | (1 << 31);
public static int GetIntAvailableRegisters()
{
return RegistersMask & ~ReservedRegsMask;
}
public static int GetVecAvailableRegisters()
{
return RegistersMask;
}
public static int GetIntCallerSavedRegisters()
{
return (GetIntCalleeSavedRegisters() ^ RegistersMask) & ~ReservedRegsMask;
}
public static int GetFpCallerSavedRegisters()
{
return GetFpCalleeSavedRegisters() ^ RegistersMask;
}
public static int GetVecCallerSavedRegisters()
{
return GetVecCalleeSavedRegisters() ^ RegistersMask;
}
public static int GetIntCalleeSavedRegisters()
{
return 0x1ff80000; // X19 to X28
}
public static int GetFpCalleeSavedRegisters()
{
return 0xff00; // D8 to D15
}
public static int GetVecCalleeSavedRegisters()
{
return 0;
}
public static int GetArgumentsOnRegsCount()
{
return 8;
}
public static int GetIntArgumentRegister(int index)
{
if ((uint)index < (uint)GetArgumentsOnRegsCount())
{
return index;
}
throw new ArgumentOutOfRangeException(nameof(index));
}
public static int GetVecArgumentRegister(int index)
{
if ((uint)index < (uint)GetArgumentsOnRegsCount())
{
return index;
}
throw new ArgumentOutOfRangeException(nameof(index));
}
public static int GetIntReturnRegister()
{
return 0;
}
public static int GetIntReturnRegisterHigh()
{
return 1;
}
public static int GetVecReturnRegister()
{
return 0;
}
}
}