463 lines
15 KiB
C++
463 lines
15 KiB
C++
// 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 <array>
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#include <tuple>
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#include <type_traits>
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#include <utility>
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#include "core/hle/ipc.h"
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#include "core/hle/kernel/handle_table.h"
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#include "core/hle/kernel/hle_ipc.h"
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#include "core/hle/kernel/kernel.h"
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namespace IPC {
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class RequestHelperBase {
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protected:
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Kernel::HLERequestContext* context = nullptr;
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u32* cmdbuf;
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ptrdiff_t index = 0;
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public:
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RequestHelperBase(u32* command_buffer) : cmdbuf(command_buffer) {}
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RequestHelperBase(Kernel::HLERequestContext& context)
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: context(&context), cmdbuf(context.CommandBuffer()) {}
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void ValidateHeader() {
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// DEBUG_ASSERT_MSG(index == TotalSize(), "Operations do not match the header (cmd 0x%x)",
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// header.raw);
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}
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void Skip(unsigned size_in_words, bool set_to_null) {
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if (set_to_null)
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memset(cmdbuf + index, 0, size_in_words * sizeof(u32));
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index += size_in_words;
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}
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/**
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* Aligns the current position forward to a 16-byte boundary, padding with zeros. Jumps forward
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* by 16-bytes at a minimum.
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*/
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void AlignWithPadding() {
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Skip(4 - (index & 3), true);
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}
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unsigned GetCurrentOffset() const {
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return static_cast<unsigned>(index);
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}
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};
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class RequestBuilder : public RequestHelperBase {
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public:
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RequestBuilder(u32* command_buffer) : RequestHelperBase(command_buffer) {}
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RequestBuilder(Kernel::HLERequestContext& context, unsigned normal_params_size,
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u32 num_handles_to_copy = 0, u32 num_handles_to_move = 0)
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: RequestHelperBase(context) {
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memset(cmdbuf, 0, 64);
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context.ClearIncomingObjects();
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IPC::CommandHeader header{};
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header.data_size.Assign(normal_params_size * sizeof(u32));
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if (num_handles_to_copy || num_handles_to_move) {
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header.enable_handle_descriptor.Assign(1);
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}
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PushRaw(header);
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if (header.enable_handle_descriptor) {
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IPC::HandleDescriptorHeader handle_descriptor_header{};
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handle_descriptor_header.num_handles_to_copy.Assign(num_handles_to_copy);
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handle_descriptor_header.num_handles_to_move.Assign(num_handles_to_move);
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PushRaw(handle_descriptor_header);
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Skip(num_handles_to_copy + num_handles_to_move, true);
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}
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AlignWithPadding();
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IPC::DataPayloadHeader data_payload_header{};
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data_payload_header.magic = Common::MakeMagic('S', 'F', 'C', 'O');
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PushRaw(data_payload_header);
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}
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// Validate on destruction, as there shouldn't be any case where we don't want it
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~RequestBuilder() {
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ValidateHeader();
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}
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template <typename T>
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void Push(T value);
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template <typename First, typename... Other>
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void Push(const First& first_value, const Other&... other_values);
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/**
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* @brief Copies the content of the given trivially copyable class to the buffer as a normal
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* param
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* @note: The input class must be correctly packed/padded to fit hardware layout.
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*/
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template <typename T>
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void PushRaw(const T& value);
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// TODO : ensure that translate params are added after all regular params
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template <typename... H>
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void PushCopyHandles(H... handles);
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template <typename... H>
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void PushMoveHandles(H... handles);
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template <typename... O>
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void PushObjects(Kernel::SharedPtr<O>... pointers);
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void PushCurrentPIDHandle();
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void PushStaticBuffer(VAddr buffer_vaddr, size_t size, u8 buffer_id);
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void PushMappedBuffer(VAddr buffer_vaddr, size_t size, MappedBufferPermissions perms);
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};
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/// Push ///
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template <>
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inline void RequestBuilder::Push(u32 value) {
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cmdbuf[index++] = value;
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}
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template <typename T>
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void RequestBuilder::PushRaw(const T& value) {
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std::memcpy(cmdbuf + index, &value, sizeof(T));
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index += (sizeof(T) + 3) / 4; // round up to word length
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}
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template <>
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inline void RequestBuilder::Push(u8 value) {
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PushRaw(value);
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}
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template <>
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inline void RequestBuilder::Push(u16 value) {
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PushRaw(value);
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}
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template <>
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inline void RequestBuilder::Push(u64 value) {
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Push(static_cast<u32>(value));
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Push(static_cast<u32>(value >> 32));
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}
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template <>
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inline void RequestBuilder::Push(bool value) {
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Push(static_cast<u8>(value));
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}
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template <>
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inline void RequestBuilder::Push(ResultCode value) {
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Push(value.raw);
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}
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template <typename First, typename... Other>
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void RequestBuilder::Push(const First& first_value, const Other&... other_values) {
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Push(first_value);
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Push(other_values...);
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}
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template <typename... H>
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inline void RequestBuilder::PushCopyHandles(H... handles) {
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Push(CopyHandleDesc(sizeof...(H)));
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Push(static_cast<Kernel::Handle>(handles)...);
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}
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template <typename... H>
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inline void RequestBuilder::PushMoveHandles(H... handles) {
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Push(MoveHandleDesc(sizeof...(H)));
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Push(static_cast<Kernel::Handle>(handles)...);
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}
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template <typename... O>
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inline void RequestBuilder::PushObjects(Kernel::SharedPtr<O>... pointers) {
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PushMoveHandles(context->AddOutgoingHandle(std::move(pointers))...);
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}
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inline void RequestBuilder::PushCurrentPIDHandle() {
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Push(CallingPidDesc());
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Push(u32(0));
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}
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inline void RequestBuilder::PushStaticBuffer(VAddr buffer_vaddr, size_t size, u8 buffer_id) {
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Push(StaticBufferDesc(size, buffer_id));
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Push(buffer_vaddr);
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}
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inline void RequestBuilder::PushMappedBuffer(VAddr buffer_vaddr, size_t size,
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MappedBufferPermissions perms) {
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Push(MappedBufferDesc(size, perms));
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Push(buffer_vaddr);
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}
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class RequestParser : public RequestHelperBase {
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public:
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RequestParser(u32* command_buffer) : RequestHelperBase(command_buffer) {}
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RequestParser(Kernel::HLERequestContext& context) : RequestHelperBase(context) {
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ASSERT_MSG(context.GetDataPayloadOffset(), "context is incomplete");
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Skip(context.GetDataPayloadOffset(), false);
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}
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RequestBuilder MakeBuilder(u32 normal_params_size, u32 num_handles_to_copy,
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u32 num_handles_to_move, bool validate_header = true) {
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if (validate_header) {
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ValidateHeader();
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}
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return {*context, normal_params_size, num_handles_to_copy, num_handles_to_move};
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}
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template <typename T>
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T Pop();
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template <typename T>
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void Pop(T& value);
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template <typename First, typename... Other>
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void Pop(First& first_value, Other&... other_values);
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/// Equivalent to calling `PopHandles<1>()[0]`.
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Kernel::Handle PopHandle();
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/**
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* Pops a descriptor containing `N` handles. The handles are returned as an array. The
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* descriptor must contain exactly `N` handles, it is not permitted to, for example, call
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* PopHandles<1>() twice to read a multi-handle descriptor with 2 handles, or to make a single
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* PopHandles<2>() call to read 2 single-handle descriptors.
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*/
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template <unsigned int N>
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std::array<Kernel::Handle, N> PopHandles();
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/// Convenience wrapper around PopHandles() which assigns the handles to the passed references.
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template <typename... H>
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void PopHandles(H&... handles) {
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std::tie(handles...) = PopHandles<sizeof...(H)>();
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}
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/// Equivalent to calling `PopGenericObjects<1>()[0]`.
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Kernel::SharedPtr<Kernel::Object> PopGenericObject();
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/// Equivalent to calling `std::get<0>(PopObjects<T>())`.
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template <typename T>
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Kernel::SharedPtr<T> PopObject();
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/**
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* Pop a descriptor containing `N` handles and resolves them to Kernel::Object pointers. If a
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* handle is invalid, null is returned for that object instead. The same caveats from
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* PopHandles() apply regarding `N` matching the number of handles in the descriptor.
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*/
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template <unsigned int N>
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std::array<Kernel::SharedPtr<Kernel::Object>, N> PopGenericObjects();
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/**
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* Resolves handles to Kernel::Objects as in PopGenericsObjects(), but then also casts them to
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* the passed `T` types, while verifying that the cast is valid. If the type of an object does
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* not match, null is returned instead.
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*/
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template <typename... T>
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std::tuple<Kernel::SharedPtr<T>...> PopObjects();
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/// Convenience wrapper around PopObjects() which assigns the handles to the passed references.
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template <typename... T>
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void PopObjects(Kernel::SharedPtr<T>&... pointers) {
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std::tie(pointers...) = PopObjects<T...>();
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}
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/**
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* @brief Pops the static buffer vaddr
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* @return The virtual address of the buffer
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* @param[out] data_size If non-null, the pointed value will be set to the size of the data
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* @param[out] useStaticBuffersToGetVaddr Indicates if we should read the vaddr from the static
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* buffers (which is the correct thing to do, but no service presently implement it) instead of
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* using the same value as the process who sent the request
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* given by the source process
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*
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* Static buffers must be set up before any IPC request using those is sent.
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* It is the duty of the process (usually services) to allocate and set up the receiving static
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* buffer information
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* Please note that the setup uses virtual addresses.
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*/
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VAddr PopStaticBuffer(size_t* data_size = nullptr, bool useStaticBuffersToGetVaddr = false);
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/**
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* @brief Pops the mapped buffer vaddr
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* @return The virtual address of the buffer
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* @param[out] data_size If non-null, the pointed value will be set to the size of the data
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* given by the source process
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* @param[out] buffer_perms If non-null, the pointed value will be set to the permissions of the
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* buffer
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*/
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VAddr PopMappedBuffer(size_t* data_size = nullptr,
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MappedBufferPermissions* buffer_perms = nullptr);
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/**
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* @brief Reads the next normal parameters as a struct, by copying it
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* @note: The output class must be correctly packed/padded to fit hardware layout.
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*/
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template <typename T>
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void PopRaw(T& value);
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/**
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* @brief Reads the next normal parameters as a struct, by copying it into a new value
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* @note: The output class must be correctly packed/padded to fit hardware layout.
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*/
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template <typename T>
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T PopRaw();
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};
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/// Pop ///
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template <>
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inline u32 RequestParser::Pop() {
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return cmdbuf[index++];
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}
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template <typename T>
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void RequestParser::PopRaw(T& value) {
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std::memcpy(&value, cmdbuf + index, sizeof(T));
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index += (sizeof(T) + 3) / 4; // round up to word length
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}
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template <typename T>
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T RequestParser::PopRaw() {
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T value;
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PopRaw(value);
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return value;
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}
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template <>
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inline u8 RequestParser::Pop() {
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return PopRaw<u8>();
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}
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template <>
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inline u16 RequestParser::Pop() {
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return PopRaw<u16>();
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}
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template <>
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inline u64 RequestParser::Pop() {
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const u64 lsw = Pop<u32>();
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const u64 msw = Pop<u32>();
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return msw << 32 | lsw;
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}
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template <>
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inline bool RequestParser::Pop() {
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return Pop<u8>() != 0;
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}
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template <>
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inline ResultCode RequestParser::Pop() {
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return ResultCode{Pop<u32>()};
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}
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template <typename T>
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void RequestParser::Pop(T& value) {
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value = Pop<T>();
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}
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template <typename First, typename... Other>
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void RequestParser::Pop(First& first_value, Other&... other_values) {
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first_value = Pop<First>();
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Pop(other_values...);
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}
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inline Kernel::Handle RequestParser::PopHandle() {
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const u32 handle_descriptor = Pop<u32>();
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DEBUG_ASSERT_MSG(IsHandleDescriptor(handle_descriptor),
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"Tried to pop handle(s) but the descriptor is not a handle descriptor");
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DEBUG_ASSERT_MSG(HandleNumberFromDesc(handle_descriptor) == 1,
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"Descriptor indicates that there isn't exactly one handle");
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return Pop<Kernel::Handle>();
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}
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template <unsigned int N>
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std::array<Kernel::Handle, N> RequestParser::PopHandles() {
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u32 handle_descriptor = Pop<u32>();
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ASSERT_MSG(IsHandleDescriptor(handle_descriptor),
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"Tried to pop handle(s) but the descriptor is not a handle descriptor");
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ASSERT_MSG(N == HandleNumberFromDesc(handle_descriptor),
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"Number of handles doesn't match the descriptor");
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std::array<Kernel::Handle, N> handles{};
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for (Kernel::Handle& handle : handles) {
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handle = Pop<Kernel::Handle>();
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}
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return handles;
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}
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inline Kernel::SharedPtr<Kernel::Object> RequestParser::PopGenericObject() {
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Kernel::Handle handle = PopHandle();
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return context->GetIncomingHandle(handle);
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}
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template <typename T>
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Kernel::SharedPtr<T> RequestParser::PopObject() {
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return Kernel::DynamicObjectCast<T>(PopGenericObject());
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}
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template <unsigned int N>
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inline std::array<Kernel::SharedPtr<Kernel::Object>, N> RequestParser::PopGenericObjects() {
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std::array<Kernel::Handle, N> handles = PopHandles<N>();
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std::array<Kernel::SharedPtr<Kernel::Object>, N> pointers;
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for (int i = 0; i < N; ++i) {
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pointers[i] = context->GetIncomingHandle(handles[i]);
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}
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return pointers;
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}
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namespace detail {
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template <typename... T, size_t... I>
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std::tuple<Kernel::SharedPtr<T>...> PopObjectsHelper(
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std::array<Kernel::SharedPtr<Kernel::Object>, sizeof...(T)>&& pointers,
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std::index_sequence<I...>) {
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return std::make_tuple(Kernel::DynamicObjectCast<T>(std::move(pointers[I]))...);
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}
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} // namespace detail
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template <typename... T>
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inline std::tuple<Kernel::SharedPtr<T>...> RequestParser::PopObjects() {
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return detail::PopObjectsHelper<T...>(PopGenericObjects<sizeof...(T)>(),
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std::index_sequence_for<T...>{});
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}
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inline VAddr RequestParser::PopStaticBuffer(size_t* data_size, bool useStaticBuffersToGetVaddr) {
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const u32 sbuffer_descriptor = Pop<u32>();
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StaticBufferDescInfo bufferInfo{sbuffer_descriptor};
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if (data_size != nullptr)
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*data_size = bufferInfo.size;
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if (!useStaticBuffersToGetVaddr)
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return Pop<VAddr>();
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else {
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ASSERT_MSG(0, "remove the assert if multiprocess/IPC translation are implemented.");
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// The buffer has already been copied to the static buffer by the kernel during
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// translation
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Pop<VAddr>(); // Pop the calling process buffer address
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// and get the vaddr from the static buffers
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return cmdbuf[(0x100 >> 2) + bufferInfo.buffer_id * 2 + 1];
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}
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}
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inline VAddr RequestParser::PopMappedBuffer(size_t* data_size,
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MappedBufferPermissions* buffer_perms) {
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const u32 sbuffer_descriptor = Pop<u32>();
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MappedBufferDescInfo bufferInfo{sbuffer_descriptor};
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if (data_size != nullptr)
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*data_size = bufferInfo.size;
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if (buffer_perms != nullptr)
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*buffer_perms = bufferInfo.perms;
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return Pop<VAddr>();
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}
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} // namespace IPC
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