dolphin/Source/Core/Common/x64ABI.h

53 lines
1.8 KiB
C
Raw Normal View History

// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#pragma once
#include "Common/x64Emitter.h"
// x64 ABI:s, and helpers to help follow them when JIT-ing code.
// All convensions return values in EAX (+ possibly EDX).
// Windows 64-bit
// * 4-reg "fastcall" variant, very new-skool stack handling
// * Callee moves stack pointer, to make room for shadow regs for the biggest function _it itself calls_
// * Parameters passed in RCX, RDX, ... further parameters are MOVed into the allocated stack space.
// Scratch: RAX RCX RDX R8 R9 R10 R11
// Callee-save: RBX RSI RDI RBP R12 R13 R14 R15
// Parameters: RCX RDX R8 R9, further MOV-ed
// Linux 64-bit
// * 6-reg "fastcall" variant, old skool stack handling (parameters are pushed)
// Scratch: RAX RCX RDX RSI RDI R8 R9 R10 R11
// Callee-save: RBX RBP R12 R13 R14 R15
// Parameters: RDI RSI RDX RCX R8 R9
#ifdef _WIN32 // 64-bit Windows - the really exotic calling convention
#define ABI_PARAM1 RCX
#define ABI_PARAM2 RDX
#define ABI_PARAM3 R8
#define ABI_PARAM4 R9
#define ABI_ALL_CALLEE_SAVED ((1 << RAX) | (1 << RCX) | (1 << RDX) | (1 << R8) | \
(1 << R9) | (1 << R10) | (1 << R11) | \
(1 << XMM0) | (1 << XMM1) | (1 << XMM2) | (1 << XMM3) | \
(1 << XMM4) | (1 << XMM5))
#else //64-bit Unix / OS X
#define ABI_PARAM1 RDI
#define ABI_PARAM2 RSI
#define ABI_PARAM3 RDX
#define ABI_PARAM4 RCX
#define ABI_PARAM5 R8
#define ABI_PARAM6 R9
#define ABI_ALL_CALLEE_SAVED ((1 << RAX) | (1 << RCX) | (1 << RDX) | (1 << RDI) | \
(1 << RSI) | (1 << R8) | (1 << R9) | (1 << R10) | (1 << R11) | \
0xffff0000 /* xmm0..15 */)
#endif // WIN32