mirror of https://github.com/citra-emu/citra.git
44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
// Copyright 2023 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 "common/arch.h"
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#if CITRA_ARCH(arm64)
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#include <type_traits>
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#include <oaknut/oaknut.hpp>
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#include "common/aarch64/oaknut_abi.h"
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namespace Common::A64 {
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// BL can only reach targets within +-128MiB(24 bits)
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inline bool IsWithin128M(uintptr_t ref, uintptr_t target) {
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const u64 distance = target - (ref + 4);
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return !(distance >= 0x800'0000ULL && distance <= ~0x800'0000ULL);
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}
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inline bool IsWithin128M(const oaknut::CodeGenerator& code, uintptr_t target) {
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return IsWithin128M(code.ptr<uintptr_t>(), target);
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}
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template <typename T>
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inline void CallFarFunction(oaknut::CodeGenerator& code, const T f) {
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static_assert(std::is_pointer_v<T>, "Argument must be a (function) pointer.");
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const std::uintptr_t addr = reinterpret_cast<std::uintptr_t>(f);
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if (IsWithin128M(code, addr)) {
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code.BL(reinterpret_cast<const void*>(f));
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} else {
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// X16(IP0) and X17(IP1) is the standard veneer register
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// LR is also available as an intermediate register
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// https://developer.arm.com/documentation/102374/0101/Procedure-Call-Standard
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code.MOVP2R(oaknut::util::X16, reinterpret_cast<const void*>(f));
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code.BLR(oaknut::util::X16);
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}
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}
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} // namespace Common::A64
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#endif // CITRA_ARCH(arm64)
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