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https://github.com/skyline-emu/skyline.git
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Implement efficient template based IOCTL deserialisation
This moves IOCTLs from frozen to a template based parser, this allows IOCTL lookup to be performed much more optimally and some IOCTLs to be inlined.
This commit is contained in:
Billy Laws
◱ Mark
parent
75a67dcfa5
commit
3340c74332
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// SPDX-License-Identifier: MIT OR MPL-2.0
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// Copyright © 2021 Skyline Team and Contributors (https://github.com/skyline-emu/)
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#pragma once
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#include <type_traits>
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#include <common.h>
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#include "types.h"
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namespace skyline::service::nvdrv::deserialisation {
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template<typename Desc, typename ArgType> requires (Desc::In && IsIn<ArgType>::value)
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constexpr ArgType DecodeArgument(span<u8, Desc::Size> buffer, size_t &offset) {
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auto out{buffer.subspan(offset).template as<ArgType>()};
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offset += sizeof(ArgType);
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return out;
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}
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template<typename Desc, typename ArgType> requires (Desc::Out && Desc::In && IsInOut<ArgType>::value)
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constexpr ArgType DecodeArgument(span<u8, Desc::Size> buffer, size_t &offset) {
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auto &out{buffer.subspan(offset).template as<RemoveInOut<ArgType>>()};
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offset += sizeof(RemoveInOut<ArgType>);
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return out;
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}
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template<typename Desc, typename ArgType> requires (Desc::Out && IsOut<ArgType>::value)
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constexpr ArgType DecodeArgument(span<u8, Desc::Size> buffer, size_t &offset) {
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auto out{Out(buffer.subspan(offset).template as<RemoveOut<ArgType>>())};
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offset += sizeof(RemoveOut<ArgType>);
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return out;
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}
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/**
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* @brief Creates a reference preserving tuple of the given types
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*/
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template <typename...Ts>
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constexpr auto make_ref_tuple(Ts&&...ts) {
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return std::tuple<Ts...>{std::forward<Ts>(ts)...};
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}
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template<typename Desc, typename ArgType, typename... ArgTypes>
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constexpr auto DecodeArgumentsImpl(span<u8, Desc::Size> buffer, size_t &offset) {
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if constexpr (IsAutoSizeSpan<ArgType>::value) {
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// AutoSizeSpan needs to be the last argument
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static_assert(sizeof...(ArgTypes) == 0);
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size_t bytes{buffer.size() - offset};
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size_t extent{bytes / sizeof(RemoveAutoSizeSpan<ArgType>)};
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return make_ref_tuple(buffer.subspan(offset, extent * sizeof(RemoveAutoSizeSpan<ArgType>)).template cast<RemoveAutoSizeSpan<ArgType>>());
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} else if constexpr (IsPad<ArgType>::value) {
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offset += ArgType::Bytes;
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return DecodeArgumentsImpl<Desc, ArgTypes...>(buffer, offset);
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} else {
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if constexpr(sizeof...(ArgTypes) == 0) {
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return make_ref_tuple(DecodeArgument<Desc, ArgType>(buffer, offset));
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} else {
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return std::tuple_cat(make_ref_tuple(DecodeArgument<Desc, ArgType>(buffer, offset)),
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DecodeArgumentsImpl<Desc, ArgTypes...>(buffer, offset));
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}
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}
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}
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/**
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* @brief This fancy thing takes a varadic template of argument types and uses it to deserialise the given buffer
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* @tparam Desc A MetaIoctlDescriptor or MetaVariableIoctlDescriptor corresponding to the IOCTL that takes these arguments
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* @return A tuple containing the arguments to be passed to the IOCTL's handler
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*/
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template<typename Desc, typename... ArgTypes>
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constexpr auto DecodeArguments(span<u8, Desc::Size> buffer) {
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size_t offset{};
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return DecodeArgumentsImpl<Desc, ArgTypes...>(buffer, offset);
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}
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}
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// SPDX-License-Identifier: MIT OR MPL-2.0
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// Copyright © 2021 Skyline Team and Contributors (https://github.com/skyline-emu/)
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#include "deserialisation.h"
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#define VARIABLE_IOCTL_HANDLER_FUNC(name, cases, variableCases) \
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PosixResult name::Ioctl(IoctlDescriptor cmd, span<u8> buffer) { \
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using className = name; \
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switch (cmd.raw) { \
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cases; \
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default: \
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cmd.size = 0; \
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switch (cmd.raw) { \
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variableCases; \
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default: \
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return PosixResult::InappropriateIoctlForDevice; \
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} \
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} \
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}
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#define IOCTL_HANDLER_FUNC(name, cases) \
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PosixResult name::Ioctl(IoctlDescriptor cmd, span<u8> buffer) { \
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using className = name; \
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switch (cmd.raw) { \
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cases; \
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default: \
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return PosixResult::InappropriateIoctlForDevice; \
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} \
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}
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#define IOCTL_CASE_ARGS_I(out, in, size, magic, function, name, ...) \
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case MetaIoctlDescriptor<out, in, size, magic, function>::Raw(): { \
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using IoctlType = MetaIoctlDescriptor< out, in, size, magic, function>; \
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auto args = DecodeArguments<IoctlType, __VA_ARGS__>(buffer.subspan<0, size>()); \
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return std::apply(&className::name, std::tuple_cat(std::make_tuple(this), args)); \
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}
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#define IOCTL_CASE_NOARGS_I(out, in, size, magic, function, name) \
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case MetaIoctlDescriptor<out, in, size, magic, function>::Raw(): \
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return className::name();
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#define IOCTL_CASE_RESULT_I(out, in, size, magic, function, result) \
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case MetaIoctlDescriptor<out, in, size, magic, function>::Raw(): \
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return result;
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#define IOCTL_CASE_ARGS(...) IOCTL_CASE_ARGS_I(__VA_ARGS__)
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#define IOCTL_CASE_NOARGS(...) IOCTL_CASE_NOARGS_I(__VA_ARGS__)
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#define IOCTL_CASE_RESULT(...) IOCTL_CASE_RESULT_I(__VA_ARGS__)
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#define VARIABLE_IOCTL_CASE_ARGS_I(out, in, magic, function, name, ...) \
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case MetaVariableIoctlDescriptor<out, in, magic, function>::Raw(): { \
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using IoctlType = MetaVariableIoctlDescriptor<out, in, magic, function>; \
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auto args = DecodeArguments<IoctlType, __VA_ARGS__>(buffer); \
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return std::apply(&className::name, std::tuple_cat(std::make_tuple(this), args)); \
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}
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#define VARIABLE_IOCTL_CASE_ARGS(...) VARIABLE_IOCTL_CASE_ARGS_I(__VA_ARGS__)
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#define IN false, true
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#define OUT true, false
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#define INOUT true, true
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#define NONE false, false
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#define SIZE(size) size
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#define FUNC(func) func
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#define MAGIC(magic) magic
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#define ARGS(...) __VA_ARGS__
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@ -0,0 +1,21 @@
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// SPDX-License-Identifier: MIT OR MPL-2.0
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// Copyright © 2021 Skyline Team and Contributors (https://github.com/skyline-emu/)
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#undef IOCTL_HANDLER_FUNC
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#undef VARIABLE_IOCTL_HANDLER_FUNC
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#undef IOCTL_CASE_ARGS_I
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#undef IOCTL_CASE_NOARGS_I
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#undef IOCTL_CASE_RESULT_I
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#undef IOCTL_CASE_ARGS
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#undef IOCTL_CASE_NOARGS
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#undef IOCTL_CASE_RESULT
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#undef VARIABLE_IOCTL_CASE_ARGS_I
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#undef VARIABLE_IOCTL_CASE_ARGS
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#undef IN
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#undef OUT
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#undef INOUT
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#undef NONE
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#undef SIZE
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#undef FUNC
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#undef MAGIC
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#undef ARGS
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// SPDX-License-Identifier: MIT OR MPL-2.0
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// Copyright © 2021 Skyline Team and Contributors (https://github.com/skyline-emu/)
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#pragma once
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#include <concepts>
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#include <common.h>
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#include <services/nvdrv/types.h>
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namespace skyline::service::nvdrv::deserialisation {
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// IOCTL parameters can't be pointers and must be trivially copyable
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template<typename T>
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concept BufferData = std::is_trivially_copyable_v<T> && !std::is_pointer_v<T>;
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// Input IOCTL template types
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template<typename T> requires BufferData<T>
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using In = const T;
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template<typename>
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struct IsIn : std::false_type {};
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template<typename T>
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struct IsIn<In<T>> : std::true_type {};
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// Input/Output IOCTL template types
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template<typename T> requires BufferData<T>
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using InOut = T &;
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template<typename>
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struct IsInOut : std::false_type {};
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template<typename T>
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struct IsInOut<InOut<T>> : std::true_type {};
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template<typename T> requires IsInOut<T>::value
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using RemoveInOut = typename std::remove_reference<T>::type;
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// Output IOCTL template types
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template<typename T> requires BufferData<T>
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class Out {
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private:
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T &ref;
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public:
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Out(T &ref) : ref(ref) {}
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using ValueType = T;
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Out& operator=(T val) {
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ref = std::move(val);
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return *this;
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}
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};
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template<typename>
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struct IsOut : std::false_type {};
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template<typename T>
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struct IsOut<Out<T>> : std::true_type {};
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template<typename T> requires IsOut<T>::value
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using RemoveOut = typename T::ValueType;
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template<typename T> requires BufferData<T>
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using AutoSizeSpan = span<T>;
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template<typename>
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struct IsAutoSizeSpan : std::false_type {};
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template<typename T>
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struct IsAutoSizeSpan<AutoSizeSpan<T>> : std::true_type {};
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template<typename T> requires IsAutoSizeSpan<T>::value
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using RemoveAutoSizeSpan = typename T::element_type;
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// Padding template type
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template<typename T, size_t Count = 1> requires BufferData<T>
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struct Pad {
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static constexpr auto Bytes{Count * sizeof(T)};
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};
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template<typename>
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struct IsPad : std::false_type {};
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template<typename T, size_t TCount>
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struct IsPad<Pad<T, TCount>> : std::true_type {};
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/**
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* @brief Describes an IOCTL as a type for use in deserialisation
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*/
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template <bool TOut, bool TIn, u16 TSize, i8 TMagic, u8 TFunction>
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struct MetaIoctlDescriptor {
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static constexpr auto Out{TOut};
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static constexpr auto In{TIn};
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static constexpr auto Size{TSize};
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static constexpr auto Magic{TMagic};
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static constexpr auto Function{TFunction};
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constexpr operator IoctlDescriptor() const {
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return {Out, In, Size, Magic, Function};
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}
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constexpr static u32 Raw() {
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u32 raw{Function};
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i8 offset{8};
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raw |= Magic << offset; offset += 8;
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raw |= Size << offset; offset += 14;
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raw |= In << offset; offset++;
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raw |= Out << offset; offset++;
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return raw;
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}
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};
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/**
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* @brief Describes a variable length IOCTL as a type for use in deserialisation
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*/
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template <bool TOut, bool TIn, i8 TMagic, u8 TFunction>
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struct MetaVariableIoctlDescriptor {
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static constexpr auto Out{TOut};
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static constexpr auto In{TIn};
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static constexpr auto Size{std::dynamic_extent};
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static constexpr auto Magic{TMagic};
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static constexpr auto Function{TFunction};
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constexpr static u32 Raw() {
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u32 raw{Function};
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i8 offset{8};
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raw |= Magic << offset; offset += 8;
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offset += 14; // Use a 0 size for raw
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raw |= In << offset; offset++;
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raw |= Out << offset; offset++;
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return raw;
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}
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};
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}
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