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e149ad4f0a
SPDX standardizes how source code conveys its copyright and licensing information. See https://spdx.github.io/spdx-spec/1-rationale/ . SPDX tags are adopted in many large projects, including things like the Linux kernel.
58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
// Copyright 2008 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include "Common/BitSet.h"
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#include "Common/x64Reg.h"
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// 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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// 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
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// 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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#define ABI_ALL_FPRS BitSet32(0xffff0000)
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#define ABI_ALL_GPRS BitSet32(0x0000ffff)
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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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// xmm0-xmm15 use the upper 16 bits in the functions that push/pop registers.
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#define ABI_ALL_CALLER_SAVED \
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(BitSet32{RAX, RCX, RDX, R8, R9, R10, R11, XMM0 + 16, XMM1 + 16, XMM2 + 16, XMM3 + 16, \
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XMM4 + 16, XMM5 + 16})
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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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// FIXME: avoid pushing all 16 XMM registers when possible? most functions we call probably
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// don't actually clobber them.
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#define ABI_ALL_CALLER_SAVED (BitSet32{RAX, RCX, RDX, RDI, RSI, R8, R9, R10, R11} | ABI_ALL_FPRS)
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#endif // WIN32
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#define ABI_ALL_CALLEE_SAVED (~ABI_ALL_CALLER_SAVED)
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#define ABI_RETURN RAX
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