288 lines
11 KiB
C++
288 lines
11 KiB
C++
// Copyright 2018 yuzu emulator team
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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 <memory>
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#include <string>
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#include <type_traits>
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#include <vector>
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#include <boost/container/small_vector.hpp>
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#include "common/common_types.h"
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#include "common/swap.h"
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#include "core/hle/ipc.h"
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#include "core/hle/kernel/object.h"
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#include "core/hle/kernel/server_session.h"
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#include "core/hle/kernel/thread.h"
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namespace Service {
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class ServiceFrameworkBase;
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}
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namespace Kernel {
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class Domain;
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class Event;
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class HandleTable;
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class HLERequestContext;
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class Process;
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/**
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* Interface implemented by HLE Session handlers.
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* This can be provided to a ServerSession in order to hook into several relevant events
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* (such as a new connection or a SyncRequest) so they can be implemented in the emulator.
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*/
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class SessionRequestHandler : public std::enable_shared_from_this<SessionRequestHandler> {
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public:
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virtual ~SessionRequestHandler() = default;
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/**
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* Handles a sync request from the emulated application.
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* @param server_session The ServerSession that was triggered for this sync request,
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* it should be used to differentiate which client (As in ClientSession) we're answering to.
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* TODO(Subv): Use a wrapper structure to hold all the information relevant to
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* this request (ServerSession, Originator thread, Translated command buffer, etc).
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* @returns ResultCode the result code of the translate operation.
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*/
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virtual ResultCode HandleSyncRequest(Kernel::HLERequestContext& context) = 0;
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/**
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* Signals that a client has just connected to this HLE handler and keeps the
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* associated ServerSession alive for the duration of the connection.
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* @param server_session Owning pointer to the ServerSession associated with the connection.
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*/
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void ClientConnected(SharedPtr<ServerSession> server_session);
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/**
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* Signals that a client has just disconnected from this HLE handler and releases the
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* associated ServerSession.
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* @param server_session ServerSession associated with the connection.
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*/
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void ClientDisconnected(const SharedPtr<ServerSession>& server_session);
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protected:
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/// List of sessions that are connected to this handler.
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/// A ServerSession whose server endpoint is an HLE implementation is kept alive by this list
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/// for the duration of the connection.
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std::vector<SharedPtr<ServerSession>> connected_sessions;
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};
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/**
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* Class containing information about an in-flight IPC request being handled by an HLE service
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* implementation. Services should avoid using old global APIs (e.g. Kernel::GetCommandBuffer()) and
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* when possible use the APIs in this class to service the request.
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*
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* HLE handle protocol
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* ===================
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*
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* To avoid needing HLE services to keep a separate handle table, or having to directly modify the
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* requester's table, a tweaked protocol is used to receive and send handles in requests. The kernel
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* will decode the incoming handles into object pointers and insert a id in the buffer where the
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* handle would normally be. The service then calls GetIncomingHandle() with that id to get the
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* pointer to the object. Similarly, instead of inserting a handle into the command buffer, the
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* service calls AddOutgoingHandle() and stores the returned id where the handle would normally go.
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*
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* The end result is similar to just giving services their own real handle tables, but since these
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* ids are local to a specific context, it avoids requiring services to manage handles for objects
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* across multiple calls and ensuring that unneeded handles are cleaned up.
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*/
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class HLERequestContext {
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public:
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explicit HLERequestContext(SharedPtr<ServerSession> session);
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~HLERequestContext();
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/// Returns a pointer to the IPC command buffer for this request.
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u32* CommandBuffer() {
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return cmd_buf.data();
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}
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/**
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* Returns the session through which this request was made. This can be used as a map key to
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* access per-client data on services.
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*/
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const SharedPtr<Kernel::ServerSession>& Session() const {
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return server_session;
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}
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using WakeupCallback = std::function<void(SharedPtr<Thread> thread, HLERequestContext& context,
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ThreadWakeupReason reason)>;
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/**
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* Puts the specified guest thread to sleep until the returned event is signaled or until the
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* specified timeout expires.
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* @param thread Thread to be put to sleep.
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* @param reason Reason for pausing the thread, to be used for debugging purposes.
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* @param timeout Timeout in nanoseconds after which the thread will be awoken and the callback
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* invoked with a Timeout reason.
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* @param callback Callback to be invoked when the thread is resumed. This callback must write
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* the entire command response once again, regardless of the state of it before this function
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* was called.
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* @param event Event to use to wake up the thread. If unspecified, an event will be created.
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* @returns Event that when signaled will resume the thread and call the callback function.
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*/
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SharedPtr<Event> SleepClientThread(SharedPtr<Thread> thread, const std::string& reason,
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u64 timeout, WakeupCallback&& callback,
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Kernel::SharedPtr<Kernel::Event> event = nullptr);
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/// Populates this context with data from the requesting process/thread.
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ResultCode PopulateFromIncomingCommandBuffer(const HandleTable& handle_table,
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u32_le* src_cmdbuf);
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/// Writes data from this context back to the requesting process/thread.
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ResultCode WriteToOutgoingCommandBuffer(Thread& thread);
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u32_le GetCommand() const {
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return command;
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}
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IPC::CommandType GetCommandType() const {
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return command_header->type;
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}
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unsigned GetDataPayloadOffset() const {
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return data_payload_offset;
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}
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const std::vector<IPC::BufferDescriptorX>& BufferDescriptorX() const {
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return buffer_x_desciptors;
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}
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const std::vector<IPC::BufferDescriptorABW>& BufferDescriptorA() const {
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return buffer_a_desciptors;
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}
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const std::vector<IPC::BufferDescriptorABW>& BufferDescriptorB() const {
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return buffer_b_desciptors;
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}
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const std::vector<IPC::BufferDescriptorC>& BufferDescriptorC() const {
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return buffer_c_desciptors;
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}
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const IPC::DomainMessageHeader* GetDomainMessageHeader() const {
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return domain_message_header.get();
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}
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bool HasDomainMessageHeader() const {
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return domain_message_header != nullptr;
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}
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/// Helper function to read a buffer using the appropriate buffer descriptor
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std::vector<u8> ReadBuffer(int buffer_index = 0) const;
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/// Helper function to write a buffer using the appropriate buffer descriptor
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std::size_t WriteBuffer(const void* buffer, std::size_t size, int buffer_index = 0) const;
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/* Helper function to write a buffer using the appropriate buffer descriptor
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*
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* @tparam ContiguousContainer an arbitrary container that satisfies the
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* ContiguousContainer concept in the C++ standard library.
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*
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* @param container The container to write the data of into a buffer.
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* @param buffer_index The buffer in particular to write to.
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*/
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template <typename ContiguousContainer,
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typename = std::enable_if_t<!std::is_pointer_v<ContiguousContainer>>>
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std::size_t WriteBuffer(const ContiguousContainer& container, int buffer_index = 0) const {
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using ContiguousType = typename ContiguousContainer::value_type;
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static_assert(std::is_trivially_copyable_v<ContiguousType>,
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"Container to WriteBuffer must contain trivially copyable objects");
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return WriteBuffer(std::data(container), std::size(container) * sizeof(ContiguousType),
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buffer_index);
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}
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/// Helper function to get the size of the input buffer
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std::size_t GetReadBufferSize(int buffer_index = 0) const;
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/// Helper function to get the size of the output buffer
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std::size_t GetWriteBufferSize(int buffer_index = 0) const;
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template <typename T>
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SharedPtr<T> GetCopyObject(std::size_t index) {
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ASSERT(index < copy_objects.size());
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return DynamicObjectCast<T>(copy_objects[index]);
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}
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template <typename T>
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SharedPtr<T> GetMoveObject(std::size_t index) {
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ASSERT(index < move_objects.size());
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return DynamicObjectCast<T>(move_objects[index]);
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}
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void AddMoveObject(SharedPtr<Object> object) {
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move_objects.emplace_back(std::move(object));
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}
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void AddCopyObject(SharedPtr<Object> object) {
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copy_objects.emplace_back(std::move(object));
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}
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void AddDomainObject(std::shared_ptr<SessionRequestHandler> object) {
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domain_objects.emplace_back(std::move(object));
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}
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template <typename T>
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std::shared_ptr<T> GetDomainRequestHandler(std::size_t index) const {
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return std::static_pointer_cast<T>(domain_request_handlers[index]);
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}
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void SetDomainRequestHandlers(
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const std::vector<std::shared_ptr<SessionRequestHandler>>& handlers) {
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domain_request_handlers = handlers;
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}
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/// Clears the list of objects so that no lingering objects are written accidentally to the
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/// response buffer.
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void ClearIncomingObjects() {
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move_objects.clear();
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copy_objects.clear();
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domain_objects.clear();
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}
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std::size_t NumMoveObjects() const {
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return move_objects.size();
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}
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std::size_t NumCopyObjects() const {
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return copy_objects.size();
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}
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std::size_t NumDomainObjects() const {
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return domain_objects.size();
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}
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std::string Description() const;
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private:
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void ParseCommandBuffer(const HandleTable& handle_table, u32_le* src_cmdbuf, bool incoming);
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std::array<u32, IPC::COMMAND_BUFFER_LENGTH> cmd_buf;
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SharedPtr<Kernel::ServerSession> server_session;
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// TODO(yuriks): Check common usage of this and optimize size accordingly
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boost::container::small_vector<SharedPtr<Object>, 8> move_objects;
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boost::container::small_vector<SharedPtr<Object>, 8> copy_objects;
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boost::container::small_vector<std::shared_ptr<SessionRequestHandler>, 8> domain_objects;
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std::shared_ptr<IPC::CommandHeader> command_header;
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std::shared_ptr<IPC::HandleDescriptorHeader> handle_descriptor_header;
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std::shared_ptr<IPC::DataPayloadHeader> data_payload_header;
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std::shared_ptr<IPC::DomainMessageHeader> domain_message_header;
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std::vector<IPC::BufferDescriptorX> buffer_x_desciptors;
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std::vector<IPC::BufferDescriptorABW> buffer_a_desciptors;
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std::vector<IPC::BufferDescriptorABW> buffer_b_desciptors;
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std::vector<IPC::BufferDescriptorABW> buffer_w_desciptors;
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std::vector<IPC::BufferDescriptorC> buffer_c_desciptors;
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unsigned data_payload_offset{};
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unsigned buffer_c_offset{};
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u32_le command{};
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std::vector<std::shared_ptr<SessionRequestHandler>> domain_request_handlers;
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};
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} // namespace Kernel
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