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78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
// Copyright 2013 Dolphin Emulator Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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#pragma once
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#include "Common/Common.h"
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// x86/x64 ABI:s, and helpers to help follow them when JIT-ing code.
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// All convensions return values in EAX (+ possibly EDX).
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// Linux 32-bit, Windows 32-bit (cdecl, System V):
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// * Caller pushes left to right
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// * Caller fixes stack after call
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// * function subtract from stack for local storage only.
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// Scratch: EAX ECX EDX
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// Callee-save: EBX ESI EDI EBP
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// Parameters: -
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// Windows 64-bit
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// * 4-reg "fastcall" variant, very new-skool stack handling
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// * Callee moves stack pointer, to make room for shadow regs for the biggest function _it itself calls_
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// * Parameters passed in RCX, RDX, ... further parameters are MOVed into the allocated stack space.
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// Scratch: RAX RCX RDX R8 R9 R10 R11
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// Callee-save: RBX RSI RDI RBP R12 R13 R14 R15
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// Parameters: RCX RDX R8 R9, further MOV-ed
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// Linux 64-bit
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// * 6-reg "fastcall" variant, old skool stack handling (parameters are pushed)
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// Scratch: RAX RCX RDX RSI RDI R8 R9 R10 R11
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// Callee-save: RBX RBP R12 R13 R14 R15
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// Parameters: RDI RSI RDX RCX R8 R9
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#ifdef _M_IX86 // 32 bit calling convention, shared by all
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// 32-bit don't pass parameters in regs, but these are convenient to have anyway when we have to
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// choose regs to put stuff in.
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#define ABI_PARAM1 RCX
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#define ABI_PARAM2 RDX
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// There are no ABI_PARAM* here, since args are pushed.
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// 32-bit bog standard cdecl, shared between linux and windows
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// MacOSX 32-bit is same as System V with a few exceptions that we probably don't care much about.
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#define ABI_ALL_CALLEE_SAVED ((1 << EAX) | (1 << ECX) | (1 << EDX) | \
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0xff00 /* xmm0..7 */)
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#else // 64 bit calling convention
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#ifdef _WIN32 // 64-bit Windows - the really exotic calling convention
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#define ABI_PARAM1 RCX
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#define ABI_PARAM2 RDX
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#define ABI_PARAM3 R8
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#define ABI_PARAM4 R9
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#define ABI_ALL_CALLEE_SAVED ((1 << RAX) | (1 << RCX) | (1 << RDX) | (1 << R8) | \
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(1 << R9) | (1 << R10) | (1 << R11) | \
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(1 << XMM0) | (1 << XMM1) | (1 << XMM2) | (1 << XMM3) | \
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(1 << XMM4) | (1 << XMM5))
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#else //64-bit Unix / OS X
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#define ABI_PARAM1 RDI
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#define ABI_PARAM2 RSI
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#define ABI_PARAM3 RDX
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#define ABI_PARAM4 RCX
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#define ABI_PARAM5 R8
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#define ABI_PARAM6 R9
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#define ABI_ALL_CALLEE_SAVED ((1 << RAX) | (1 << RCX) | (1 << RDX) | (1 << RDI) | \
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(1 << RSI) | (1 << R8) | (1 << R9) | (1 << R10) | (1 << R11) | \
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0xffff0000 /* xmm0..15 */)
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#endif // WIN32
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#endif // X86
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