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