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