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6fd0333c14
Uses are split into three categories:
- Arbitrary (except for size savings) - constants like RSCRATCH are
used.
- ABI (i.e. RAX as return value) - ABI_RETURN is used.
- Fixed by architecture (RCX shifts, RDX/RAX for some instructions) -
explicit register is kept.
In theory this allows the assignments to be modified easily. I verified
that I was able to run Melee with all the registers changed, although
there may be issues if RSCRATCH[2] and ABI_PARAM{1,2} conflict.
57 lines
2 KiB
C
57 lines
2 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/x64Emitter.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 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 _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 ((1 << RAX) | (1 << RCX) | (1 << RDX) | (1 << R8) | \
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(1 << R9) | (1 << R10) | (1 << R11) | \
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(1 << (XMM0+16)) | (1 << (XMM1+16)) | (1 << (XMM2+16)) | (1 << (XMM3+16)) | \
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(1 << (XMM4+16)) | (1 << (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 ((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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#define ABI_RETURN RAX
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