1 files changed, 57 insertions, 0 deletions
diff --git a/src/dolphin/x64ABI.h b/src/dolphin/x64ABI.h
new file mode 100644
index 0000000..997782e
--- /dev/null
+++ b/src/dolphin/x64ABI.h
@@ -0,0 +1,57 @@
+// Copyright 2008 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license_dolphin.txt file included.
+
+#pragma once
+
+#include "BitSet.h"
+#include "x64Reg.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
+
+#define ABI_ALL_FPRS BitSet32(0xffff0000)
+#define ABI_ALL_GPRS BitSet32(0x0000ffff)
+
+#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
+
+// xmm0-xmm15 use the upper 16 bits in the functions that push/pop registers.
+#define ABI_ALL_CALLER_SAVED                                                                       \
+  (BitSet32{RAX, RCX, RDX, R8, R9, R10, R11})
+#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
+
+// FIXME: avoid pushing all 16 XMM registers when possible? most functions we call probably
+// don't actually clobber them.
+#define ABI_ALL_CALLER_SAVED (BitSet32{RAX, RCX, RDX, RDI, RSI, R8, R9, R10, R11} | ABI_ALL_FPRS)
+#endif  // WIN32
+
+#define ABI_ALL_CALLEE_SAVED (~ABI_ALL_CALLER_SAVED)
+
+#define ABI_RETURN RAX