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034d0a2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | // Copyright 2023 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include "common/arch.h"
#if CITRA_ARCH(arm64)
#include <type_traits>
#include <oaknut/oaknut.hpp>
#include "common/aarch64/oaknut_abi.h"
namespace Common::A64 {
// BL can only reach targets within +-128MiB(24 bits)
inline bool IsWithin128M(uintptr_t ref, uintptr_t target) {
const u64 distance = target - (ref + 4);
return !(distance >= 0x800'0000ULL && distance <= ~0x800'0000ULL);
}
inline bool IsWithin128M(const oaknut::CodeGenerator& code, uintptr_t target) {
return IsWithin128M(code.xptr<uintptr_t>(), target);
}
template <typename T>
inline void CallFarFunction(oaknut::CodeGenerator& code, const T f) {
static_assert(std::is_pointer_v<T>, "Argument must be a (function) pointer.");
const std::uintptr_t addr = reinterpret_cast<std::uintptr_t>(f);
if (IsWithin128M(code, addr)) {
code.BL(reinterpret_cast<const void*>(f));
} else {
// X16(IP0) and X17(IP1) is the standard veneer register
// LR is also available as an intermediate register
// https://developer.arm.com/documentation/102374/0101/Procedure-Call-Standard
code.MOVP2R(oaknut::util::X16, reinterpret_cast<const void*>(f));
code.BLR(oaknut::util::X16);
}
}
} // namespace Common::A64
#endif // CITRA_ARCH(arm64)
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