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https://github.com/Ryujinx/Ryujinx.git
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159 lines
4.7 KiB
C#
159 lines
4.7 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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namespace ARMeilleure.CodeGen.X86
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{
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static class CallingConvention
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{
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private const int RegistersMask = 0xffff;
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public static int GetIntAvailableRegisters()
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{
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return RegistersMask & ~(1 << (int)X86Register.Rsp);
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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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if (GetCurrentCallConv() == CallConvName.Windows)
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{
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return (1 << (int)X86Register.Rax) |
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(1 << (int)X86Register.Rcx) |
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(1 << (int)X86Register.Rdx) |
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(1 << (int)X86Register.R8) |
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(1 << (int)X86Register.R9) |
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(1 << (int)X86Register.R10) |
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(1 << (int)X86Register.R11);
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}
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else /* if (GetCurrentCallConv() == CallConvName.SystemV) */
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{
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return (1 << (int)X86Register.Rax) |
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(1 << (int)X86Register.Rcx) |
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(1 << (int)X86Register.Rdx) |
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(1 << (int)X86Register.Rsi) |
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(1 << (int)X86Register.Rdi) |
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(1 << (int)X86Register.R8) |
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(1 << (int)X86Register.R9) |
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(1 << (int)X86Register.R10) |
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(1 << (int)X86Register.R11);
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}
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}
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public static int GetVecCallerSavedRegisters()
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{
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if (GetCurrentCallConv() == CallConvName.Windows)
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{
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return (1 << (int)X86Register.Xmm0) |
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(1 << (int)X86Register.Xmm1) |
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(1 << (int)X86Register.Xmm2) |
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(1 << (int)X86Register.Xmm3) |
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(1 << (int)X86Register.Xmm4) |
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(1 << (int)X86Register.Xmm5);
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}
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else /* if (GetCurrentCallConv() == CallConvName.SystemV) */
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{
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return RegistersMask;
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}
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}
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public static int GetIntCalleeSavedRegisters()
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{
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return GetIntCallerSavedRegisters() ^ RegistersMask;
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}
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public static int GetVecCalleeSavedRegisters()
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{
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return GetVecCallerSavedRegisters() ^ RegistersMask;
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}
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public static int GetArgumentsOnRegsCount()
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{
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return 4;
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}
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public static int GetIntArgumentsOnRegsCount()
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{
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return 6;
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}
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public static int GetVecArgumentsOnRegsCount()
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{
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return 8;
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}
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public static X86Register GetIntArgumentRegister(int index)
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{
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if (GetCurrentCallConv() == CallConvName.Windows)
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{
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switch (index)
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{
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case 0: return X86Register.Rcx;
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case 1: return X86Register.Rdx;
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case 2: return X86Register.R8;
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case 3: return X86Register.R9;
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}
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}
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else /* if (GetCurrentCallConv() == CallConvName.SystemV) */
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{
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switch (index)
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{
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case 0: return X86Register.Rdi;
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case 1: return X86Register.Rsi;
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case 2: return X86Register.Rdx;
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case 3: return X86Register.Rcx;
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case 4: return X86Register.R8;
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case 5: return X86Register.R9;
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}
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}
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throw new ArgumentOutOfRangeException(nameof(index));
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}
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public static X86Register GetVecArgumentRegister(int index)
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{
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int count;
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if (GetCurrentCallConv() == CallConvName.Windows)
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{
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count = 4;
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}
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else /* if (GetCurrentCallConv() == CallConvName.SystemV) */
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{
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count = 8;
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}
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if ((uint)index < count)
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{
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return X86Register.Xmm0 + index;
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}
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throw new ArgumentOutOfRangeException(nameof(index));
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}
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public static X86Register GetIntReturnRegister()
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{
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return X86Register.Rax;
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}
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public static X86Register GetIntReturnRegisterHigh()
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{
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return X86Register.Rdx;
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}
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public static X86Register GetVecReturnRegister()
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{
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return X86Register.Xmm0;
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}
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public static CallConvName GetCurrentCallConv()
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{
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return RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
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? CallConvName.Windows
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: CallConvName.SystemV;
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}
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}
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}
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