// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <array>
#include <memory>
#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/kernel.h"
#include "core/hle/kernel/server_session.h"
namespace Service {
class ServiceFrameworkBase;
}
namespace Kernel {
class Domain;
class HandleTable;
class HLERequestContext;
class Process;
/**
* 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:
virtual ~SessionRequestHandler() = default;
/**
* 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(SharedPtr<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(SharedPtr<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<SharedPtr<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:
HLERequestContext(SharedPtr<Kernel::ServerSession> session);
~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 SharedPtr<Kernel::ServerSession>& Session() const {
return server_session;
}
void ParseCommandBuffer(u32_le* src_cmdbuf, bool incoming);
/// Populates this context with data from the requesting process/thread.
ResultCode PopulateFromIncomingCommandBuffer(u32_le* src_cmdbuf, Process& src_process,
HandleTable& src_table);
/// Writes data from this context back to the requesting process/thread.
ResultCode WriteToOutgoingCommandBuffer(u32_le* dst_cmdbuf, Process& dst_process,
HandleTable& dst_table);
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 std::unique_ptr<IPC::DomainMessageHeader>& GetDomainMessageHeader() const {
return domain_message_header;
}
/// Helper function to read a buffer using the appropriate buffer descriptor
std::vector<u8> ReadBuffer() const;
/// Helper function to write a buffer using the appropriate buffer descriptor
size_t WriteBuffer(const void* buffer, size_t size) const;
/// Helper function to write a buffer using the appropriate buffer descriptor
size_t WriteBuffer(const std::vector<u8>& buffer) const;
/// Helper function to get the size of the input buffer
size_t GetReadBufferSize() const;
/// Helper function to get the size of the output buffer
size_t GetWriteBufferSize() const;
template <typename T>
SharedPtr<T> GetCopyObject(size_t index) {
ASSERT(index < copy_objects.size());
return DynamicObjectCast<T>(copy_objects[index]);
}
template <typename T>
SharedPtr<T> GetMoveObject(size_t index) {
ASSERT(index < move_objects.size());
return DynamicObjectCast<T>(move_objects[index]);
}
void AddMoveObject(SharedPtr<Object> object) {
move_objects.emplace_back(std::move(object));
}
void AddCopyObject(SharedPtr<Object> object) {
copy_objects.emplace_back(std::move(object));
}
void AddDomainObject(std::shared_ptr<SessionRequestHandler> object) {
domain_objects.emplace_back(std::move(object));
}
/// 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();
}
size_t NumMoveObjects() const {
return move_objects.size();
}
size_t NumCopyObjects() const {
return copy_objects.size();
}
size_t NumDomainObjects() const {
return domain_objects.size();
}
std::string Description() const;
private:
std::array<u32, IPC::COMMAND_BUFFER_LENGTH> cmd_buf;
SharedPtr<Kernel::ServerSession> server_session;
// TODO(yuriks): Check common usage of this and optimize size accordingly
boost::container::small_vector<SharedPtr<Object>, 8> move_objects;
boost::container::small_vector<SharedPtr<Object>, 8> copy_objects;
boost::container::small_vector<std::shared_ptr<SessionRequestHandler>, 8> domain_objects;
std::unique_ptr<IPC::CommandHeader> command_header;
std::unique_ptr<IPC::HandleDescriptorHeader> handle_descriptor_header;
std::unique_ptr<IPC::DataPayloadHeader> data_payload_header;
std::unique_ptr<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{};
};
} // namespace Kernel
