500 lines
14 KiB
C++
500 lines
14 KiB
C++
// SPDX-FileCopyrightText: 2016 Citra Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <cstring>
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#include <memory>
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#include <type_traits>
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#include <utility>
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "core/hle/ipc.h"
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#include "core/hle/kernel/hle_ipc.h"
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#include "core/hle/kernel/k_process.h"
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#include "core/hle/kernel/k_resource_limit.h"
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#include "core/hle/kernel/k_session.h"
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#include "core/hle/result.h"
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namespace IPC {
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constexpr Result ERR_REMOTE_PROCESS_DEAD{ErrorModule::HIPC, 301};
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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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u32 index = 0;
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public:
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explicit RequestHelperBase(u32* command_buffer) : cmdbuf(command_buffer) {}
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explicit RequestHelperBase(Kernel::HLERequestContext& ctx)
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: context(&ctx), cmdbuf(ctx.CommandBuffer()) {}
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void Skip(u32 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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}
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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.
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*/
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void AlignWithPadding() {
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if (index & 3) {
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Skip(static_cast<u32>(4 - (index & 3)), true);
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}
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}
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u32 GetCurrentOffset() const {
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return index;
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}
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void SetCurrentOffset(u32 offset) {
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index = offset;
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}
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};
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class ResponseBuilder : public RequestHelperBase {
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public:
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/// Flags used for customizing the behavior of ResponseBuilder
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enum class Flags : u32 {
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None = 0,
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/// Uses move handles to move objects in the response, even when in a domain. This is
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/// required when PushMoveObjects is used.
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AlwaysMoveHandles = 1,
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};
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explicit ResponseBuilder(Kernel::HLERequestContext& ctx, u32 normal_params_size_,
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u32 num_handles_to_copy_ = 0, u32 num_objects_to_move_ = 0,
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Flags flags = Flags::None)
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: RequestHelperBase(ctx), normal_params_size(normal_params_size_),
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num_handles_to_copy(num_handles_to_copy_),
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num_objects_to_move(num_objects_to_move_), kernel{ctx.kernel} {
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memset(cmdbuf, 0, sizeof(u32) * IPC::COMMAND_BUFFER_LENGTH);
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IPC::CommandHeader header{};
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// The entire size of the raw data section in u32 units, including the 16 bytes of mandatory
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// padding.
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u32 raw_data_size = ctx.write_size =
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ctx.IsTipc() ? normal_params_size - 1 : normal_params_size;
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u32 num_handles_to_move{};
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u32 num_domain_objects{};
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const bool always_move_handles{
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(static_cast<u32>(flags) & static_cast<u32>(Flags::AlwaysMoveHandles)) != 0};
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if (!ctx.Session()->IsDomain() || always_move_handles) {
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num_handles_to_move = num_objects_to_move;
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} else {
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num_domain_objects = num_objects_to_move;
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}
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if (ctx.Session()->IsDomain()) {
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raw_data_size +=
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static_cast<u32>(sizeof(DomainMessageHeader) / sizeof(u32) + num_domain_objects);
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ctx.write_size += num_domain_objects;
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}
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if (ctx.IsTipc()) {
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header.type.Assign(ctx.GetCommandType());
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} else {
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raw_data_size += static_cast<u32>(sizeof(IPC::DataPayloadHeader) / sizeof(u32) + 4 +
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normal_params_size);
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}
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header.data_size.Assign(raw_data_size);
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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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ctx.handles_offset = index;
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Skip(num_handles_to_copy + num_handles_to_move, true);
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}
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if (!ctx.IsTipc()) {
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AlignWithPadding();
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if (ctx.Session()->IsDomain() && ctx.HasDomainMessageHeader()) {
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IPC::DomainMessageHeader domain_header{};
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domain_header.num_objects = num_domain_objects;
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PushRaw(domain_header);
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}
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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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data_payload_index = index;
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ctx.data_payload_offset = index;
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ctx.write_size += index;
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ctx.domain_offset = static_cast<u32>(index + raw_data_size / sizeof(u32));
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}
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template <class T>
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void PushIpcInterface(std::shared_ptr<T> iface) {
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if (context->Session()->IsDomain()) {
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context->AddDomainObject(std::move(iface));
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} else {
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kernel.CurrentProcess()->GetResourceLimit()->Reserve(
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Kernel::LimitableResource::Sessions, 1);
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auto* session = Kernel::KSession::Create(kernel);
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session->Initialize(nullptr, iface->GetServiceName(),
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std::make_shared<Kernel::SessionRequestManager>(kernel));
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context->AddMoveObject(&session->GetClientSession());
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iface->ClientConnected(&session->GetServerSession());
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}
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}
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template <class T, class... Args>
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void PushIpcInterface(Args&&... args) {
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PushIpcInterface<T>(std::make_shared<T>(std::forward<Args>(args)...));
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}
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void PushImpl(s8 value);
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void PushImpl(s16 value);
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void PushImpl(s32 value);
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void PushImpl(s64 value);
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void PushImpl(u8 value);
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void PushImpl(u16 value);
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void PushImpl(u32 value);
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void PushImpl(u64 value);
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void PushImpl(float value);
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void PushImpl(double value);
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void PushImpl(bool value);
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void PushImpl(Result value);
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template <typename T>
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void Push(T value) {
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return PushImpl(value);
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}
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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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* Helper function for pushing strongly-typed enumeration values.
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*
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* @tparam Enum The enumeration type to be pushed
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*
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* @param value The value to push.
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*
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* @note The underlying size of the enumeration type is the size of the
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* data that gets pushed. e.g. "enum class SomeEnum : u16" will
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* push a u16-sized amount of data.
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*/
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template <typename Enum>
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void PushEnum(Enum value) {
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static_assert(std::is_enum_v<Enum>, "T must be an enum type within a PushEnum call.");
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static_assert(!std::is_convertible_v<Enum, int>,
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"enum type in PushEnum must be a strongly typed enum.");
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Push(static_cast<std::underlying_type_t<Enum>>(value));
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}
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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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template <typename... O>
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void PushMoveObjects(O*... pointers);
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template <typename... O>
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void PushMoveObjects(O&... pointers);
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template <typename... O>
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void PushCopyObjects(O*... pointers);
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template <typename... O>
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void PushCopyObjects(O&... pointers);
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private:
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u32 normal_params_size{};
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u32 num_handles_to_copy{};
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u32 num_objects_to_move{}; ///< Domain objects or move handles, context dependent
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u32 data_payload_index{};
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Kernel::KernelCore& kernel;
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};
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/// Push ///
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inline void ResponseBuilder::PushImpl(s32 value) {
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cmdbuf[index++] = value;
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}
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inline void ResponseBuilder::PushImpl(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 ResponseBuilder::PushRaw(const T& value) {
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static_assert(std::is_trivially_copyable_v<T>,
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"It's undefined behavior to use memcpy with non-trivially copyable objects");
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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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inline void ResponseBuilder::PushImpl(Result value) {
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// Result codes are actually 64-bit in the IPC buffer, but only the high part is discarded.
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Push(value.raw);
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Push<u32>(0);
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}
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inline void ResponseBuilder::PushImpl(s8 value) {
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PushRaw(value);
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}
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inline void ResponseBuilder::PushImpl(s16 value) {
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PushRaw(value);
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}
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inline void ResponseBuilder::PushImpl(s64 value) {
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PushImpl(static_cast<u32>(value));
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PushImpl(static_cast<u32>(value >> 32));
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}
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inline void ResponseBuilder::PushImpl(u8 value) {
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PushRaw(value);
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}
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inline void ResponseBuilder::PushImpl(u16 value) {
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PushRaw(value);
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}
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inline void ResponseBuilder::PushImpl(u64 value) {
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PushImpl(static_cast<u32>(value));
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PushImpl(static_cast<u32>(value >> 32));
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}
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inline void ResponseBuilder::PushImpl(float value) {
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u32 integral;
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std::memcpy(&integral, &value, sizeof(u32));
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PushImpl(integral);
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}
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inline void ResponseBuilder::PushImpl(double value) {
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u64 integral;
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std::memcpy(&integral, &value, sizeof(u64));
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PushImpl(integral);
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}
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inline void ResponseBuilder::PushImpl(bool value) {
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PushImpl(static_cast<u8>(value));
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}
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template <typename First, typename... Other>
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void ResponseBuilder::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... O>
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inline void ResponseBuilder::PushCopyObjects(O*... pointers) {
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auto objects = {pointers...};
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for (auto& object : objects) {
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context->AddCopyObject(object);
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}
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}
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template <typename... O>
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inline void ResponseBuilder::PushCopyObjects(O&... pointers) {
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auto objects = {&pointers...};
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for (auto& object : objects) {
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context->AddCopyObject(object);
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}
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}
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template <typename... O>
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inline void ResponseBuilder::PushMoveObjects(O*... pointers) {
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auto objects = {pointers...};
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for (auto& object : objects) {
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context->AddMoveObject(object);
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}
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}
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template <typename... O>
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inline void ResponseBuilder::PushMoveObjects(O&... pointers) {
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auto objects = {&pointers...};
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for (auto& object : objects) {
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context->AddMoveObject(object);
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}
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}
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class RequestParser : public RequestHelperBase {
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public:
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explicit RequestParser(u32* command_buffer) : RequestHelperBase(command_buffer) {}
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explicit RequestParser(Kernel::HLERequestContext& ctx) : RequestHelperBase(ctx) {
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// TIPC does not have data payload offset
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if (!ctx.IsTipc()) {
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ASSERT_MSG(ctx.GetDataPayloadOffset(), "context is incomplete");
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Skip(ctx.GetDataPayloadOffset(), false);
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}
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// Skip the u64 command id, it's already stored in the context
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static constexpr u32 CommandIdSize = 2;
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Skip(CommandIdSize, false);
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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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template <typename T>
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T PopEnum() {
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static_assert(std::is_enum_v<T>, "T must be an enum type within a PopEnum call.");
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static_assert(!std::is_convertible_v<T, int>,
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"enum type in PopEnum must be a strongly typed enum.");
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return static_cast<T>(Pop<std::underlying_type_t<T>>());
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}
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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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template <class T>
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std::weak_ptr<T> PopIpcInterface() {
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ASSERT(context->Session()->IsDomain());
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ASSERT(context->GetDomainMessageHeader().input_object_count > 0);
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return context->GetDomainHandler<T>(Pop<u32>() - 1);
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}
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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 <>
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inline s32 RequestParser::Pop() {
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return static_cast<s32>(Pop<u32>());
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}
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// Ignore the -Wclass-memaccess warning on memcpy for non-trivially default constructible objects.
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#if defined(__GNUC__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wclass-memaccess"
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#endif
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template <typename T>
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void RequestParser::PopRaw(T& value) {
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static_assert(std::is_trivially_copyable_v<T>,
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"It's undefined behavior to use memcpy with non-trivially copyable objects");
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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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#if defined(__GNUC__)
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#pragma GCC diagnostic pop
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#endif
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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 s8 RequestParser::Pop() {
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return static_cast<s8>(Pop<u8>());
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}
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template <>
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inline s16 RequestParser::Pop() {
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return static_cast<s16>(Pop<u16>());
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}
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template <>
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inline s64 RequestParser::Pop() {
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return static_cast<s64>(Pop<u64>());
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}
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template <>
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inline float RequestParser::Pop() {
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const u32 value = Pop<u32>();
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float real;
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std::memcpy(&real, &value, sizeof(real));
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return real;
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}
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template <>
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inline double RequestParser::Pop() {
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const u64 value = Pop<u64>();
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double real;
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std::memcpy(&real, &value, sizeof(real));
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return real;
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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 Result RequestParser::Pop() {
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return Result{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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} // namespace IPC
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