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-rw-r--r--src/common/x64/xbyak_util.h47
1 files changed, 47 insertions, 0 deletions
diff --git a/src/common/x64/xbyak_util.h b/src/common/x64/xbyak_util.h
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+++ b/src/common/x64/xbyak_util.h
@@ -0,0 +1,47 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <type_traits>
+#include <xbyak.h>
+#include "common/x64/xbyak_abi.h"
+
+namespace Common::X64 {
+
+// Constants for use with cmpps/cmpss
+enum {
+ CMP_EQ = 0,
+ CMP_LT = 1,
+ CMP_LE = 2,
+ CMP_UNORD = 3,
+ CMP_NEQ = 4,
+ CMP_NLT = 5,
+ CMP_NLE = 6,
+ CMP_ORD = 7,
+};
+
+constexpr bool IsWithin2G(uintptr_t ref, uintptr_t target) {
+ const u64 distance = target - (ref + 5);
+ return !(distance >= 0x8000'0000ULL && distance <= ~0x8000'0000ULL);
+}
+
+inline bool IsWithin2G(const Xbyak::CodeGenerator& code, uintptr_t target) {
+ return IsWithin2G(reinterpret_cast<uintptr_t>(code.getCurr()), target);
+}
+
+template <typename T>
+inline void CallFarFunction(Xbyak::CodeGenerator& code, const T f) {
+ static_assert(std::is_pointer_v<T>, "Argument must be a (function) pointer.");
+ size_t addr = reinterpret_cast<size_t>(f);
+ if (IsWithin2G(code, addr)) {
+ code.call(f);
+ } else {
+ // ABI_RETURN is a safe temp register to use before a call
+ code.mov(ABI_RETURN, addr);
+ code.call(ABI_RETURN);
+ }
+}
+
+} // namespace Common::X64