// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <array>
#include <functional>
#include <memory>
#include <optional>
#include <string>
#include <type_traits>
#include <vector>
#include <boost/container/small_vector.hpp>
#include "common/common_types.h"
#include "common/swap.h"
#include "core/hle/ipc.h"
#include "core/hle/kernel/object.h"
union ResultCode;
namespace Service {
class ServiceFrameworkBase;
}
namespace Kernel {
class Domain;
class HandleTable;
class HLERequestContext;
class Process;
class ServerSession;
class Thread;
class ReadableEvent;
class WritableEvent;
enum class ThreadWakeupReason;
/**
* Interface implemented by HLE Session handlers.
* This can be provided to a ServerSession in order to hook into several relevant events
* (such as a new connection or a SyncRequest) so they can be implemented in the emulator.
*/
class SessionRequestHandler : public std::enable_shared_from_this<SessionRequestHandler> {
public:
SessionRequestHandler();
virtual ~SessionRequestHandler();
/**
* Handles a sync request from the emulated application.
* @param server_session The ServerSession that was triggered for this sync request,
* it should be used to differentiate which client (As in ClientSession) we're answering to.
* TODO(Subv): Use a wrapper structure to hold all the information relevant to
* this request (ServerSession, Originator thread, Translated command buffer, etc).
* @returns ResultCode the result code of the translate operation.
*/
virtual ResultCode HandleSyncRequest(Kernel::HLERequestContext& context) = 0;
/**
* Signals that a client has just connected to this HLE handler and keeps the
* associated ServerSession alive for the duration of the connection.
* @param server_session Owning pointer to the ServerSession associated with the connection.
*/
void ClientConnected(std::shared_ptr<ServerSession> server_session);
/**
* Signals that a client has just disconnected from this HLE handler and releases the
* associated ServerSession.
* @param server_session ServerSession associated with the connection.
*/
void ClientDisconnected(const std::shared_ptr<ServerSession>& server_session);
protected:
/// List of sessions that are connected to this handler.
/// A ServerSession whose server endpoint is an HLE implementation is kept alive by this list
/// for the duration of the connection.
std::vector<std::shared_ptr<ServerSession>> connected_sessions;
};
/**
* Class containing information about an in-flight IPC request being handled by an HLE service
* implementation. Services should avoid using old global APIs (e.g. Kernel::GetCommandBuffer()) and
* when possible use the APIs in this class to service the request.
*
* HLE handle protocol
* ===================
*
* To avoid needing HLE services to keep a separate handle table, or having to directly modify the
* requester's table, a tweaked protocol is used to receive and send handles in requests. The kernel
* will decode the incoming handles into object pointers and insert a id in the buffer where the
* handle would normally be. The service then calls GetIncomingHandle() with that id to get the
* pointer to the object. Similarly, instead of inserting a handle into the command buffer, the
* service calls AddOutgoingHandle() and stores the returned id where the handle would normally go.
*
* The end result is similar to just giving services their own real handle tables, but since these
* ids are local to a specific context, it avoids requiring services to manage handles for objects
* across multiple calls and ensuring that unneeded handles are cleaned up.
*/
class HLERequestContext {
public:
explicit HLERequestContext(std::shared_ptr<ServerSession> session,
std::shared_ptr<Thread> thread);
~HLERequestContext();
/// Returns a pointer to the IPC command buffer for this request.
u32* CommandBuffer() {
return cmd_buf.data();
}
/**
* Returns the session through which this request was made. This can be used as a map key to
* access per-client data on services.
*/
const std::shared_ptr<Kernel::ServerSession>& Session() const {
return server_session;
}
using WakeupCallback = std::function<void(
std::shared_ptr<Thread> thread, HLERequestContext& context, ThreadWakeupReason reason)>;
/**
* Puts the specified guest thread to sleep until the returned event is signaled or until the
* specified timeout expires.
* @param reason Reason for pausing the thread, to be used for debugging purposes.
* @param timeout Timeout in nanoseconds after which the thread will be awoken and the callback
* invoked with a Timeout reason.
* @param callback Callback to be invoked when the thread is resumed. This callback must write
* the entire command response once again, regardless of the state of it before this function
* was called.
* @param writable_event Event to use to wake up the thread. If unspecified, an event will be
* created.
* @returns Event that when signaled will resume the thread and call the callback function.
*/
std::shared_ptr<WritableEvent> SleepClientThread(
const std::string& reason, u64 timeout, WakeupCallback&& callback,
std::shared_ptr<WritableEvent> writable_event = nullptr);
/// Populates this context with data from the requesting process/thread.
ResultCode PopulateFromIncomingCommandBuffer(const HandleTable& handle_table,
u32_le* src_cmdbuf);
/// Writes data from this context back to the requesting process/thread.
ResultCode WriteToOutgoingCommandBuffer(Thread& thread);
u32_le GetCommand() const {
return command;
}
IPC::CommandType GetCommandType() const {
return command_header->type;
}
unsigned GetDataPayloadOffset() const {
return data_payload_offset;
}
const std::vector<IPC::BufferDescriptorX>& BufferDescriptorX() const {
return buffer_x_desciptors;
}
const std::vector<IPC::BufferDescriptorABW>& BufferDescriptorA() const {
return buffer_a_desciptors;
}
const std::vector<IPC::BufferDescriptorABW>& BufferDescriptorB() const {
return buffer_b_desciptors;
}
const std::vector<IPC::BufferDescriptorC>& BufferDescriptorC() const {
return buffer_c_desciptors;
}
const IPC::DomainMessageHeader& GetDomainMessageHeader() const {
return domain_message_header.value();
}
bool HasDomainMessageHeader() const {
return domain_message_header.has_value();
}
/// Helper function to read a buffer using the appropriate buffer descriptor
std::vector<u8> ReadBuffer(int buffer_index = 0) const;
/// Helper function to write a buffer using the appropriate buffer descriptor
std::size_t WriteBuffer(const void* buffer, std::size_t size, int buffer_index = 0) const;
/* Helper function to write a buffer using the appropriate buffer descriptor
*
* @tparam ContiguousContainer an arbitrary container that satisfies the
* ContiguousContainer concept in the C++ standard library.
*
* @param container The container to write the data of into a buffer.
* @param buffer_index The buffer in particular to write to.
*/
template <typename ContiguousContainer,
typename = std::enable_if_t<!std::is_pointer_v<ContiguousContainer>>>
std::size_t WriteBuffer(const ContiguousContainer& container, int buffer_index = 0) const {
using ContiguousType = typename ContiguousContainer::value_type;
static_assert(std::is_trivially_copyable_v<ContiguousType>,
"Container to WriteBuffer must contain trivially copyable objects");
return WriteBuffer(std::data(container), std::size(container) * sizeof(ContiguousType),
buffer_index);
}
/// Helper function to get the size of the input buffer
std::size_t GetReadBufferSize(int buffer_index = 0) const;
/// Helper function to get the size of the output buffer
std::size_t GetWriteBufferSize(int buffer_index = 0) const;
template <typename T>
std::shared_ptr<T> GetCopyObject(std::size_t index) {
return DynamicObjectCast<T>(copy_objects.at(index));
}
template <typename T>
std::shared_ptr<T> GetMoveObject(std::size_t index) {
return DynamicObjectCast<T>(move_objects.at(index));
}
void AddMoveObject(std::shared_ptr<Object> object) {
move_objects.emplace_back(std::move(object));
}
void AddCopyObject(std::shared_ptr<Object> object) {
copy_objects.emplace_back(std::move(object));
}
void AddDomainObject(std::shared_ptr<SessionRequestHandler> object) {
domain_objects.emplace_back(std::move(object));
}
template <typename T>
std::shared_ptr<T> GetDomainRequestHandler(std::size_t index) const {
return std::static_pointer_cast<T>(domain_request_handlers.at(index));
}
void SetDomainRequestHandlers(
const std::vector<std::shared_ptr<SessionRequestHandler>>& handlers) {
domain_request_handlers = handlers;
}
/// Clears the list of objects so that no lingering objects are written accidentally to the
/// response buffer.
void ClearIncomingObjects() {
move_objects.clear();
copy_objects.clear();
domain_objects.clear();
}
std::size_t NumMoveObjects() const {
return move_objects.size();
}
std::size_t NumCopyObjects() const {
return copy_objects.size();
}
std::size_t NumDomainObjects() const {
return domain_objects.size();
}
std::string Description() const;
private:
void ParseCommandBuffer(const HandleTable& handle_table, u32_le* src_cmdbuf, bool incoming);
std::array<u32, IPC::COMMAND_BUFFER_LENGTH> cmd_buf;
std::shared_ptr<Kernel::ServerSession> server_session;
std::shared_ptr<Thread> thread;
// TODO(yuriks): Check common usage of this and optimize size accordingly
boost::container::small_vector<std::shared_ptr<Object>, 8> move_objects;
boost::container::small_vector<std::shared_ptr<Object>, 8> copy_objects;
boost::container::small_vector<std::shared_ptr<SessionRequestHandler>, 8> domain_objects;
std::optional<IPC::CommandHeader> command_header;
std::optional<IPC::HandleDescriptorHeader> handle_descriptor_header;
std::optional<IPC::DataPayloadHeader> data_payload_header;
std::optional<IPC::DomainMessageHeader> domain_message_header;
std::vector<IPC::BufferDescriptorX> buffer_x_desciptors;
std::vector<IPC::BufferDescriptorABW> buffer_a_desciptors;
std::vector<IPC::BufferDescriptorABW> buffer_b_desciptors;
std::vector<IPC::BufferDescriptorABW> buffer_w_desciptors;
std::vector<IPC::BufferDescriptorC> buffer_c_desciptors;
unsigned data_payload_offset{};
unsigned buffer_c_offset{};
u32_le command{};
std::vector<std::shared_ptr<SessionRequestHandler>> domain_request_handlers;
};
} // namespace Kernel
