Merge pull request #137 from bunnei/improve-ipc

Improve IPC, unify Domains and Sessions, and add validation

32 files changed, 311 insertions, 452 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 242c2db0c..70547c8b2 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -36,8 +36,6 @@ add_library(core STATIC
     hle/kernel/client_session.h
     hle/kernel/condition_variable.cpp
     hle/kernel/condition_variable.h
-    hle/kernel/domain.cpp
-    hle/kernel/domain.h
     hle/kernel/errors.h
     hle/kernel/event.cpp
     hle/kernel/event.h
@@ -67,7 +65,6 @@ add_library(core STATIC
     hle/kernel/svc.cpp
     hle/kernel/svc.h
     hle/kernel/svc_wrap.h
-    hle/kernel/sync_object.h
     hle/kernel/thread.cpp
     hle/kernel/thread.h
     hle/kernel/timer.cpp
diff --git a/src/core/hle/ipc_helpers.h b/src/core/hle/ipc_helpers.h
index ab479b49b..6066d8a18 100644
--- a/src/core/hle/ipc_helpers.h
+++ b/src/core/hle/ipc_helpers.h
@@ -11,7 +11,6 @@
 #include "core/hle/ipc.h"
 #include "core/hle/kernel/client_port.h"
 #include "core/hle/kernel/client_session.h"
-#include "core/hle/kernel/domain.h"
 #include "core/hle/kernel/handle_table.h"
 #include "core/hle/kernel/hle_ipc.h"
 #include "core/hle/kernel/kernel.h"
@@ -31,11 +30,6 @@ public:
     RequestHelperBase(Kernel::HLERequestContext& context)
         : context(&context), cmdbuf(context.CommandBuffer()) {}
 
-    void ValidateHeader() {
-        // DEBUG_ASSERT_MSG(index == TotalSize(), "Operations do not match the header (cmd 0x%x)",
-        //                 header.raw);
-    }
-
     void Skip(unsigned size_in_words, bool set_to_null) {
         if (set_to_null)
             memset(cmdbuf + index, 0, size_in_words * sizeof(u32));
@@ -60,14 +54,30 @@ public:
     }
 };
 
-class RequestBuilder : public RequestHelperBase {
+class ResponseBuilder : public RequestHelperBase {
 public:
-    RequestBuilder(u32* command_buffer) : RequestHelperBase(command_buffer) {}
+    ResponseBuilder(u32* command_buffer) : RequestHelperBase(command_buffer) {}
+
+    u32 normal_params_size{};
+    u32 num_handles_to_copy{};
+    u32 num_objects_to_move{}; ///< Domain objects or move handles, context dependent
+    std::ptrdiff_t datapayload_index{};
+
+    /// Flags used for customizing the behavior of ResponseBuilder
+    enum class Flags : u32 {
+        None = 0,
+        /// Uses move handles to move objects in the response, even when in a domain. This is
+        /// required when PushMoveObjects is used.
+        AlwaysMoveHandles = 1,
+    };
+
+    ResponseBuilder(Kernel::HLERequestContext& context, u32 normal_params_size,
+                    u32 num_handles_to_copy = 0, u32 num_objects_to_move = 0,
+                    Flags flags = Flags::None)
+
+        : RequestHelperBase(context), normal_params_size(normal_params_size),
+          num_handles_to_copy(num_handles_to_copy), num_objects_to_move(num_objects_to_move) {
 
-    RequestBuilder(Kernel::HLERequestContext& context, unsigned normal_params_size,
-                   u32 num_handles_to_copy = 0, u32 num_handles_to_move = 0,
-                   u32 num_domain_objects = 0)
-        : RequestHelperBase(context) {
         memset(cmdbuf, 0, sizeof(u32) * IPC::COMMAND_BUFFER_LENGTH);
 
         context.ClearIncomingObjects();
@@ -77,12 +87,19 @@ public:
         // The entire size of the raw data section in u32 units, including the 16 bytes of mandatory
         // padding.
         u32 raw_data_size = sizeof(IPC::DataPayloadHeader) / 4 + 4 + normal_params_size;
-        if (context.IsDomain()) {
-            raw_data_size += sizeof(DomainMessageHeader) / 4 + num_domain_objects;
+
+        u32 num_handles_to_move{};
+        u32 num_domain_objects{};
+        const bool always_move_handles{
+            (static_cast<u32>(flags) & static_cast<u32>(Flags::AlwaysMoveHandles)) != 0};
+        if (!context.Session()->IsDomain() || always_move_handles) {
+            num_handles_to_move = num_objects_to_move;
         } else {
-            // If we're not in a domain, turn the domain object parameters into move handles.
-            num_handles_to_move += num_domain_objects;
-            num_domain_objects = 0;
+            num_domain_objects = num_objects_to_move;
+        }
+
+        if (context.Session()->IsDomain()) {
+            raw_data_size += sizeof(DomainMessageHeader) / 4 + num_domain_objects;
         }
 
         header.data_size.Assign(raw_data_size);
@@ -101,7 +118,7 @@ public:
 
         AlignWithPadding();
 
-        if (context.IsDomain()) {
+        if (context.Session()->IsDomain()) {
             IPC::DomainMessageHeader domain_header{};
             domain_header.num_objects = num_domain_objects;
             PushRaw(domain_header);
@@ -110,12 +127,13 @@ public:
         IPC::DataPayloadHeader data_payload_header{};
         data_payload_header.magic = Common::MakeMagic('S', 'F', 'C', 'O');
         PushRaw(data_payload_header);
+
+        datapayload_index = index;
     }
 
-    template <class T, class... Args>
-    void PushIpcInterface(Args&&... args) {
-        auto iface = std::make_shared<T>(std::forward<Args>(args)...);
-        if (context->IsDomain()) {
+    template <class T>
+    void PushIpcInterface(std::shared_ptr<T> iface) {
+        if (context->Session()->IsDomain()) {
             context->AddDomainObject(std::move(iface));
         } else {
             auto sessions = Kernel::ServerSession::CreateSessionPair(iface->GetServiceName());
@@ -126,8 +144,26 @@ public:
         }
     }
 
+    template <class T, class... Args>
+    void PushIpcInterface(Args&&... args) {
+        PushIpcInterface<T>(std::make_shared<T>(std::forward<Args>(args)...));
+    }
+
+    void ValidateHeader() {
+        const size_t num_domain_objects = context->NumDomainObjects();
+        const size_t num_move_objects = context->NumMoveObjects();
+        ASSERT_MSG(!num_domain_objects || !num_move_objects,
+                   "cannot move normal handles and domain objects");
+        ASSERT_MSG((index - datapayload_index) == normal_params_size,
+                   "normal_params_size value is incorrect");
+        ASSERT_MSG((num_domain_objects + num_move_objects) == num_objects_to_move,
+                   "num_objects_to_move value is incorrect");
+        ASSERT_MSG(context->NumCopyObjects() == num_handles_to_copy,
+                   "num_handles_to_copy value is incorrect");
+    }
+
     // Validate on destruction, as there shouldn't be any case where we don't want it
-    ~RequestBuilder() {
+    ~ResponseBuilder() {
         ValidateHeader();
     }
 
@@ -155,52 +191,52 @@ public:
 /// Push ///
 
 template <>
-inline void RequestBuilder::Push(u32 value) {
+inline void ResponseBuilder::Push(u32 value) {
     cmdbuf[index++] = value;
 }
 
 template <typename T>
-void RequestBuilder::PushRaw(const T& value) {
+void ResponseBuilder::PushRaw(const T& value) {
     std::memcpy(cmdbuf + index, &value, sizeof(T));
     index += (sizeof(T) + 3) / 4; // round up to word length
 }
 
 template <>
-inline void RequestBuilder::Push(ResultCode value) {
+inline void ResponseBuilder::Push(ResultCode value) {
     // Result codes are actually 64-bit in the IPC buffer, but only the high part is discarded.
     Push(value.raw);
     Push<u32>(0);
 }
 
 template <>
-inline void RequestBuilder::Push(u8 value) {
+inline void ResponseBuilder::Push(u8 value) {
     PushRaw(value);
 }
 
 template <>
-inline void RequestBuilder::Push(u16 value) {
+inline void ResponseBuilder::Push(u16 value) {
     PushRaw(value);
 }
 
 template <>
-inline void RequestBuilder::Push(u64 value) {
+inline void ResponseBuilder::Push(u64 value) {
     Push(static_cast<u32>(value));
     Push(static_cast<u32>(value >> 32));
 }
 
 template <>
-inline void RequestBuilder::Push(bool value) {
+inline void ResponseBuilder::Push(bool value) {
     Push(static_cast<u8>(value));
 }
 
 template <typename First, typename... Other>
-void RequestBuilder::Push(const First& first_value, const Other&... other_values) {
+void ResponseBuilder::Push(const First& first_value, const Other&... other_values) {
     Push(first_value);
     Push(other_values...);
 }
 
 template <typename... O>
-inline void RequestBuilder::PushCopyObjects(Kernel::SharedPtr<O>... pointers) {
+inline void ResponseBuilder::PushCopyObjects(Kernel::SharedPtr<O>... pointers) {
     auto objects = {pointers...};
     for (auto& object : objects) {
         context->AddCopyObject(std::move(object));
@@ -208,7 +244,7 @@ inline void RequestBuilder::PushCopyObjects(Kernel::SharedPtr<O>... pointers) {
 }
 
 template <typename... O>
-inline void RequestBuilder::PushMoveObjects(Kernel::SharedPtr<O>... pointers) {
+inline void ResponseBuilder::PushMoveObjects(Kernel::SharedPtr<O>... pointers) {
     auto objects = {pointers...};
     for (auto& object : objects) {
         context->AddMoveObject(std::move(object));
@@ -227,15 +263,10 @@ public:
         Skip(CommandIdSize, false);
     }
 
-    RequestBuilder MakeBuilder(u32 normal_params_size, u32 num_handles_to_copy,
-                               u32 num_handles_to_move, u32 num_domain_objects,
-                               bool validate_header = true) {
-        if (validate_header) {
-            ValidateHeader();
-        }
-
-        return {*context, normal_params_size, num_handles_to_copy, num_handles_to_move,
-                num_domain_objects};
+    ResponseBuilder MakeBuilder(u32 normal_params_size, u32 num_handles_to_copy,
+                                u32 num_handles_to_move,
+                                ResponseBuilder::Flags flags = ResponseBuilder::Flags::None) {
+        return {*context, normal_params_size, num_handles_to_copy, num_handles_to_move, flags};
     }
 
     template <typename T>
diff --git a/src/core/hle/kernel/client_session.h b/src/core/hle/kernel/client_session.h
index d6ab4f893..2258f95bc 100644
--- a/src/core/hle/kernel/client_session.h
+++ b/src/core/hle/kernel/client_session.h
@@ -7,7 +7,7 @@
 #include <memory>
 #include <string>
 #include "common/common_types.h"
-#include "core/hle/kernel/sync_object.h"
+#include "core/hle/kernel/kernel.h"
 #include "core/hle/result.h"
 
 namespace Kernel {
@@ -16,7 +16,7 @@ class ServerSession;
 class Session;
 class Thread;
 
-class ClientSession final : public SyncObject {
+class ClientSession final : public Object {
 public:
     friend class ServerSession;
 
@@ -33,7 +33,7 @@ public:
         return HANDLE_TYPE;
     }
 
-    ResultCode SendSyncRequest(SharedPtr<Thread> thread) override;
+    ResultCode SendSyncRequest(SharedPtr<Thread> thread);
 
     std::string name; ///< Name of client port (optional)
 
diff --git a/src/core/hle/kernel/domain.cpp b/src/core/hle/kernel/domain.cpp
deleted file mode 100644
index 5035e9c08..000000000
--- a/src/core/hle/kernel/domain.cpp
+++ /dev/null
@@ -1,63 +0,0 @@
-// Copyright 2018 yuzu emulator team
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#include "common/logging/log.h"
-#include "core/hle/ipc_helpers.h"
-#include "core/hle/kernel/client_port.h"
-#include "core/hle/kernel/domain.h"
-#include "core/hle/kernel/handle_table.h"
-#include "core/hle/kernel/hle_ipc.h"
-#include "core/hle/kernel/process.h"
-#include "core/hle/kernel/session.h"
-#include "core/hle/kernel/thread.h"
-
-namespace Kernel {
-
-ResultVal<SharedPtr<Domain>> Domain::Create(std::string name) {
-    SharedPtr<Domain> domain(new Domain);
-    domain->name = std::move(name);
-    return MakeResult(std::move(domain));
-}
-
-ResultVal<SharedPtr<Domain>> Domain::CreateFromSession(const Session& session) {
-    auto res = Create(session.port->GetName() + "_Domain");
-    auto& domain = res.Unwrap();
-    domain->request_handlers.push_back(std::move(session.server->hle_handler));
-    Kernel::g_handle_table.ConvertSessionToDomain(session, domain);
-    return res;
-}
-
-ResultCode Domain::SendSyncRequest(SharedPtr<Thread> thread) {
-    Kernel::HLERequestContext context(this);
-    u32* cmd_buf = (u32*)Memory::GetPointer(Kernel::GetCurrentThread()->GetTLSAddress());
-    context.PopulateFromIncomingCommandBuffer(cmd_buf, *Kernel::g_current_process,
-                                              Kernel::g_handle_table);
-
-    auto& domain_message_header = context.GetDomainMessageHeader();
-    if (domain_message_header) {
-        // If there is a DomainMessageHeader, then this is CommandType "Request"
-        const u32 object_id{context.GetDomainMessageHeader()->object_id};
-        switch (domain_message_header->command) {
-        case IPC::DomainMessageHeader::CommandType::SendMessage:
-            return request_handlers[object_id - 1]->HandleSyncRequest(context);
-
-        case IPC::DomainMessageHeader::CommandType::CloseVirtualHandle: {
-            LOG_DEBUG(IPC, "CloseVirtualHandle, object_id=0x%08X", object_id);
-
-            request_handlers[object_id - 1] = nullptr;
-
-            IPC::RequestBuilder rb{context, 2};
-            rb.Push(RESULT_SUCCESS);
-
-            return RESULT_SUCCESS;
-        }
-        }
-
-        LOG_CRITICAL(IPC, "Unknown domain command=%d", domain_message_header->command.Value());
-        UNIMPLEMENTED();
-    }
-    return request_handlers.front()->HandleSyncRequest(context);
-}
-
-} // namespace Kernel
diff --git a/src/core/hle/kernel/domain.h b/src/core/hle/kernel/domain.h
deleted file mode 100644
index 3fec3b0b2..000000000
--- a/src/core/hle/kernel/domain.h
+++ /dev/null
@@ -1,45 +0,0 @@
-// Copyright 2018 yuzu emulator team
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#pragma once
-
-#include <memory>
-#include <string>
-#include <vector>
-#include "core/hle/kernel/sync_object.h"
-#include "core/hle/result.h"
-
-namespace Kernel {
-
-class Session;
-class SessionRequestHandler;
-
-class Domain final : public SyncObject {
-public:
-    std::string GetTypeName() const override {
-        return "Domain";
-    }
-
-    static const HandleType HANDLE_TYPE = HandleType::Domain;
-    HandleType GetHandleType() const override {
-        return HANDLE_TYPE;
-    }
-
-    static ResultVal<SharedPtr<Domain>> CreateFromSession(const Session& server);
-
-    ResultCode SendSyncRequest(SharedPtr<Thread> thread) override;
-
-    /// The name of this domain (optional)
-    std::string name;
-
-    std::vector<std::shared_ptr<SessionRequestHandler>> request_handlers;
-
-private:
-    Domain() = default;
-    ~Domain() override = default;
-
-    static ResultVal<SharedPtr<Domain>> Create(std::string name = "Unknown");
-};
-
-} // namespace Kernel
diff --git a/src/core/hle/kernel/handle_table.cpp b/src/core/hle/kernel/handle_table.cpp
index 74d3d0514..3beb55753 100644
--- a/src/core/hle/kernel/handle_table.cpp
+++ b/src/core/hle/kernel/handle_table.cpp
@@ -5,12 +5,10 @@
 #include <utility>
 #include "common/assert.h"
 #include "common/logging/log.h"
-#include "core/hle/kernel/client_session.h"
 #include "core/hle/kernel/errors.h"
 #include "core/hle/kernel/handle_table.h"
 #include "core/hle/kernel/kernel.h"
 #include "core/hle/kernel/process.h"
-#include "core/hle/kernel/session.h"
 #include "core/hle/kernel/thread.h"
 
 namespace Kernel {
@@ -55,14 +53,6 @@ ResultVal<Handle> HandleTable::Duplicate(Handle handle) {
     return Create(std::move(object));
 }
 
-void HandleTable::ConvertSessionToDomain(const Session& session, SharedPtr<Object> domain) {
-    for (auto& object : objects) {
-        if (DynamicObjectCast<ClientSession>(object) == session.client) {
-            object = domain;
-        }
-    }
-}
-
 ResultCode HandleTable::Close(Handle handle) {
     if (!IsValid(handle))
         return ERR_INVALID_HANDLE;
diff --git a/src/core/hle/kernel/handle_table.h b/src/core/hle/kernel/handle_table.h
index 935cc22b5..ba968c666 100644
--- a/src/core/hle/kernel/handle_table.h
+++ b/src/core/hle/kernel/handle_table.h
@@ -17,8 +17,6 @@ enum KernelHandle : Handle {
     CurrentProcess = 0xFFFF8001,
 };
 
-class Session;
-
 /**
  * This class allows the creation of Handles, which are references to objects that can be tested
  * for validity and looked up. Here they are used to pass references to kernel objects to/from the
@@ -62,11 +60,6 @@ public:
     ResultVal<Handle> Duplicate(Handle handle);
 
     /**
-     * Convert all handles of the specified Session to the specified Domain.
-     */
-    void ConvertSessionToDomain(const Session& session, SharedPtr<Object> domain);
-
-    /**
      * Closes a handle, removing it from the table and decreasing the object's ref-count.
      * @return `RESULT_SUCCESS` or one of the following errors:
      *           - `ERR_INVALID_HANDLE`: an invalid handle was passed in.
diff --git a/src/core/hle/kernel/hle_ipc.cpp b/src/core/hle/kernel/hle_ipc.cpp
index ecf32c18a..db104e8a2 100644
--- a/src/core/hle/kernel/hle_ipc.cpp
+++ b/src/core/hle/kernel/hle_ipc.cpp
@@ -7,7 +7,6 @@
 #include "common/common_funcs.h"
 #include "common/common_types.h"
 #include "core/hle/ipc_helpers.h"
-#include "core/hle/kernel/domain.h"
 #include "core/hle/kernel/handle_table.h"
 #include "core/hle/kernel/hle_ipc.h"
 #include "core/hle/kernel/kernel.h"
@@ -26,10 +25,6 @@ void SessionRequestHandler::ClientDisconnected(SharedPtr<ServerSession> server_s
     boost::range::remove_erase(connected_sessions, server_session);
 }
 
-HLERequestContext::HLERequestContext(SharedPtr<Kernel::Domain> domain) : domain(std::move(domain)) {
-    cmd_buf[0] = 0;
-}
-
 HLERequestContext::HLERequestContext(SharedPtr<Kernel::ServerSession> server_session)
     : server_session(std::move(server_session)) {
     cmd_buf[0] = 0;
@@ -87,7 +82,7 @@ void HLERequestContext::ParseCommandBuffer(u32_le* src_cmdbuf, bool incoming) {
     // Padding to align to 16 bytes
     rp.AlignWithPadding();
 
-    if (IsDomain() && (command_header->type == IPC::CommandType::Request || !incoming)) {
+    if (Session()->IsDomain() && (command_header->type == IPC::CommandType::Request || !incoming)) {
         // If this is an incoming message, only CommandType "Request" has a domain header
         // All outgoing domain messages have the domain header
         domain_message_header =
@@ -200,12 +195,12 @@ ResultCode HLERequestContext::WriteToOutgoingCommandBuffer(u32_le* dst_cmdbuf, P
 
     // TODO(Subv): Translate the X/A/B/W buffers.
 
-    if (IsDomain()) {
+    if (Session()->IsDomain()) {
         ASSERT(domain_message_header->num_objects == domain_objects.size());
         // Write the domain objects to the command buffer, these go after the raw untranslated data.
         // TODO(Subv): This completely ignores C buffers.
         size_t domain_offset = size - domain_message_header->num_objects;
-        auto& request_handlers = domain->request_handlers;
+        auto& request_handlers = server_session->domain_request_handlers;
 
         for (auto& object : domain_objects) {
             request_handlers.emplace_back(object);
diff --git a/src/core/hle/kernel/hle_ipc.h b/src/core/hle/kernel/hle_ipc.h
index 80fa48d7f..da8335b35 100644
--- a/src/core/hle/kernel/hle_ipc.h
+++ b/src/core/hle/kernel/hle_ipc.h
@@ -86,7 +86,6 @@ protected:
  */
 class HLERequestContext {
 public:
-    HLERequestContext(SharedPtr<Kernel::Domain> domain);
     HLERequestContext(SharedPtr<Kernel::ServerSession> session);
     ~HLERequestContext();
 
@@ -96,17 +95,10 @@ public:
     }
 
     /**
-     * Returns the domain through which this request was made.
-     */
-    const SharedPtr<Kernel::Domain>& Domain() const {
-        return domain;
-    }
-
-    /**
      * 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>& ServerSession() const {
+    const SharedPtr<Kernel::ServerSession>& Session() const {
         return server_session;
     }
 
@@ -151,10 +143,6 @@ public:
         return domain_message_header;
     }
 
-    bool IsDomain() const {
-        return domain != nullptr;
-    }
-
     template <typename T>
     SharedPtr<T> GetCopyObject(size_t index) {
         ASSERT(index < copy_objects.size());
@@ -187,9 +175,20 @@ public:
         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();
+    }
+
 private:
     std::array<u32, IPC::COMMAND_BUFFER_LENGTH> cmd_buf;
-    SharedPtr<Kernel::Domain> domain;
     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;
diff --git a/src/core/hle/kernel/kernel.h b/src/core/hle/kernel/kernel.h
index 4d9549e45..c77e58f3c 100644
--- a/src/core/hle/kernel/kernel.h
+++ b/src/core/hle/kernel/kernel.h
@@ -31,7 +31,6 @@ enum class HandleType : u32 {
     ServerPort,
     ClientSession,
     ServerSession,
-    Domain,
 };
 
 enum {
@@ -84,27 +83,12 @@ public:
         case HandleType::CodeSet:
         case HandleType::ClientPort:
         case HandleType::ClientSession:
-        case HandleType::Domain:
             return false;
         }
 
         UNREACHABLE();
     }
 
-    /**
-     * Check if svcSendSyncRequest can be called on the object
-     * @return True svcSendSyncRequest can be called on the object, otherwise false
-     */
-    bool IsSyncable() const {
-        switch (GetHandleType()) {
-        case HandleType::ClientSession:
-        case HandleType::Domain:
-            return true;
-        }
-
-        UNREACHABLE();
-    }
-
 public:
     static unsigned int next_object_id;
 
diff --git a/src/core/hle/kernel/server_session.cpp b/src/core/hle/kernel/server_session.cpp
index 09d02a691..54481f7f1 100644
--- a/src/core/hle/kernel/server_session.cpp
+++ b/src/core/hle/kernel/server_session.cpp
@@ -4,6 +4,7 @@
 
 #include <tuple>
 
+#include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/client_port.h"
 #include "core/hle/kernel/client_session.h"
 #include "core/hle/kernel/handle_table.h"
@@ -61,6 +62,38 @@ ResultCode ServerSession::HandleSyncRequest(SharedPtr<Thread> thread) {
     // from its ClientSession, so wake up any threads that may be waiting on a svcReplyAndReceive or
     // similar.
 
+    Kernel::HLERequestContext context(this);
+    u32* cmd_buf = (u32*)Memory::GetPointer(thread->GetTLSAddress());
+    context.PopulateFromIncomingCommandBuffer(cmd_buf, *Kernel::g_current_process,
+                                              Kernel::g_handle_table);
+
+    // If the session has been converted to a domain, handle the doomain request
+    if (IsDomain()) {
+        auto& domain_message_header = context.GetDomainMessageHeader();
+        if (domain_message_header) {
+            // If there is a DomainMessageHeader, then this is CommandType "Request"
+            const u32 object_id{context.GetDomainMessageHeader()->object_id};
+            switch (domain_message_header->command) {
+            case IPC::DomainMessageHeader::CommandType::SendMessage:
+                return domain_request_handlers[object_id - 1]->HandleSyncRequest(context);
+
+            case IPC::DomainMessageHeader::CommandType::CloseVirtualHandle: {
+                LOG_DEBUG(IPC, "CloseVirtualHandle, object_id=0x%08X", object_id);
+
+                domain_request_handlers[object_id - 1] = nullptr;
+
+                IPC::ResponseBuilder rb{context, 2};
+                rb.Push(RESULT_SUCCESS);
+                return RESULT_SUCCESS;
+            }
+            }
+
+            LOG_CRITICAL(IPC, "Unknown domain command=%d", domain_message_header->command.Value());
+            ASSERT(false);
+        }
+        // If there is no domain header, the regular session handler is used
+    }
+
     // If this ServerSession has an associated HLE handler, forward the request to it.
     ResultCode result{RESULT_SUCCESS};
     if (hle_handler != nullptr) {
@@ -69,11 +102,6 @@ ResultCode ServerSession::HandleSyncRequest(SharedPtr<Thread> thread) {
         if (translate_result.IsError())
             return translate_result;
 
-        Kernel::HLERequestContext context(this);
-        u32* cmd_buf = (u32*)Memory::GetPointer(Kernel::GetCurrentThread()->GetTLSAddress());
-        context.PopulateFromIncomingCommandBuffer(cmd_buf, *Kernel::g_current_process,
-                                                  Kernel::g_handle_table);
-
         result = hle_handler->HandleSyncRequest(context);
     } else {
         // Add the thread to the list of threads that have issued a sync request with this
@@ -84,6 +112,15 @@ ResultCode ServerSession::HandleSyncRequest(SharedPtr<Thread> thread) {
     // If this ServerSession does not have an HLE implementation, just wake up the threads waiting
     // on it.
     WakeupAllWaitingThreads();
+
+    // Handle scenario when ConvertToDomain command was issued, as we must do the conversion at the
+    // end of the command such that only commands following this one are handled as domains
+    if (convert_to_domain) {
+        ASSERT_MSG(domain_request_handlers.empty(), "already a domain");
+        domain_request_handlers = {hle_handler};
+        convert_to_domain = false;
+    }
+
     return result;
 }
 
diff --git a/src/core/hle/kernel/server_session.h b/src/core/hle/kernel/server_session.h
index 6ff4ef8c1..144692106 100644
--- a/src/core/hle/kernel/server_session.h
+++ b/src/core/hle/kernel/server_session.h
@@ -79,7 +79,10 @@ public:
     std::string name;                ///< The name of this session (optional)
     std::shared_ptr<Session> parent; ///< The parent session, which links to the client endpoint.
     std::shared_ptr<SessionRequestHandler>
-        hle_handler; ///< This session's HLE request handler (optional)
+        hle_handler; ///< This session's HLE request handler (applicable when not a domain)
+
+    /// This is the list of domain request handlers (after conversion to a domain)
+    std::vector<std::shared_ptr<SessionRequestHandler>> domain_request_handlers;
 
     /// List of threads that are pending a response after a sync request. This list is processed in
     /// a LIFO manner, thus, the last request will be dispatched first.
@@ -91,6 +94,16 @@ public:
     /// TODO(Subv): Find a better name for this.
     SharedPtr<Thread> currently_handling;
 
+    /// Returns true if the session has been converted to a domain, otherwise False
+    bool IsDomain() const {
+        return !domain_request_handlers.empty();
+    }
+
+    /// Converts the session to a domain at the end of the current command
+    void ConvertToDomain() {
+        convert_to_domain = true;
+    }
+
 private:
     ServerSession();
     ~ServerSession() override;
@@ -102,6 +115,9 @@ private:
      * @return The created server session
      */
     static ResultVal<SharedPtr<ServerSession>> Create(std::string name = "Unknown");
+
+    /// When set to True, converts the session to a domain at the end of the command
+    bool convert_to_domain{};
 };
 
 /**
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp
index 516309036..4c0276cf0 100644
--- a/src/core/hle/kernel/svc.cpp
+++ b/src/core/hle/kernel/svc.cpp
@@ -20,7 +20,6 @@
 #include "core/hle/kernel/shared_memory.h"
 #include "core/hle/kernel/svc.h"
 #include "core/hle/kernel/svc_wrap.h"
-#include "core/hle/kernel/sync_object.h"
 #include "core/hle/kernel/thread.h"
 #include "core/hle/lock.h"
 #include "core/hle/result.h"
@@ -87,7 +86,7 @@ static ResultCode ConnectToNamedPort(Handle* out_handle, VAddr port_name_address
 
 /// Makes a blocking IPC call to an OS service.
 static ResultCode SendSyncRequest(Handle handle) {
-    SharedPtr<SyncObject> session = g_handle_table.Get<SyncObject>(handle);
+    SharedPtr<ClientSession> session = g_handle_table.Get<ClientSession>(handle);
     if (!session) {
         LOG_ERROR(Kernel_SVC, "called with invalid handle=0x%08X", handle);
         return ERR_INVALID_HANDLE;
diff --git a/src/core/hle/kernel/sync_object.h b/src/core/hle/kernel/sync_object.h
deleted file mode 100644
index f2befa2ea..000000000
--- a/src/core/hle/kernel/sync_object.h
+++ /dev/null
@@ -1,35 +0,0 @@
-// Copyright 2018 yuzu emulator team
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#pragma once
-
-#include <boost/smart_ptr/intrusive_ptr.hpp>
-#include "core/hle/kernel/kernel.h"
-#include "core/hle/result.h"
-
-namespace Kernel {
-
-class Thread;
-
-/// Class that represents a Kernel object that svcSendSyncRequest can be called on
-class SyncObject : public Object {
-public:
-    /**
-     * Handle a sync request from the emulated application.
-     * @param thread Thread that initiated the request.
-     * @returns ResultCode from the operation.
-     */
-    virtual ResultCode SendSyncRequest(SharedPtr<Thread> thread) = 0;
-};
-
-// Specialization of DynamicObjectCast for SyncObjects
-template <>
-inline SharedPtr<SyncObject> DynamicObjectCast<SyncObject>(SharedPtr<Object> object) {
-    if (object != nullptr && object->IsSyncable()) {
-        return boost::static_pointer_cast<SyncObject>(std::move(object));
-    }
-    return nullptr;
-}
-
-} // namespace Kernel
diff --git a/src/core/hle/service/acc/acc_u0.cpp b/src/core/hle/service/acc/acc_u0.cpp
index 7f0192fd3..67f05aad4 100644
--- a/src/core/hle/service/acc/acc_u0.cpp
+++ b/src/core/hle/service/acc/acc_u0.cpp
@@ -22,7 +22,7 @@ private:
     void GetBase(Kernel::HLERequestContext& ctx) {
         LOG_WARNING(Service, "(STUBBED) called");
         ProfileBase profile_base{};
-        IPC::RequestBuilder rb{ctx, 16};
+        IPC::ResponseBuilder rb{ctx, 16};
         rb.Push(RESULT_SUCCESS);
         rb.PushRaw(profile_base);
     }
@@ -40,7 +40,7 @@ public:
 private:
     void CheckAvailability(Kernel::HLERequestContext& ctx) {
         LOG_WARNING(Service, "(STUBBED) called");
-        IPC::RequestBuilder rb{ctx, 3};
+        IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);
         rb.Push(true); // TODO: Check when this is supposed to return true and when not
     }
@@ -48,13 +48,13 @@ private:
 
 void ACC_U0::GetUserExistence(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service, "(STUBBED) called");
-    IPC::RequestBuilder rb{ctx, 3};
+    IPC::ResponseBuilder rb{ctx, 3};
     rb.Push(RESULT_SUCCESS);
     rb.Push(true); // TODO: Check when this is supposed to return true and when not
 }
 
 void ACC_U0::GetProfile(Kernel::HLERequestContext& ctx) {
-    IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
     rb.PushIpcInterface<IProfile>();
     LOG_DEBUG(Service, "called");
@@ -62,12 +62,12 @@ void ACC_U0::GetProfile(Kernel::HLERequestContext& ctx) {
 
 void ACC_U0::InitializeApplicationInfo(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service, "(STUBBED) called");
-    IPC::RequestBuilder rb{ctx, 2};
+    IPC::ResponseBuilder rb{ctx, 2};
     rb.Push(RESULT_SUCCESS);
 }
 
 void ACC_U0::GetBaasAccountManagerForApplication(Kernel::HLERequestContext& ctx) {
-    IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
     rb.PushIpcInterface<IManagerForApplication>();
     LOG_DEBUG(Service, "called");
diff --git a/src/core/hle/service/am/applet_oe.cpp b/src/core/hle/service/am/applet_oe.cpp
index 7d16b45f3..15b7701e0 100644
--- a/src/core/hle/service/am/applet_oe.cpp
+++ b/src/core/hle/service/am/applet_oe.cpp
@@ -25,14 +25,14 @@ public:
 private:
     void GetAppletResourceUserId(Kernel::HLERequestContext& ctx) {
         LOG_WARNING(Service, "(STUBBED) called");
-        IPC::RequestBuilder rb{ctx, 4};
+        IPC::ResponseBuilder rb{ctx, 4};
         rb.Push(RESULT_SUCCESS);
         rb.Push<u64>(0);
     }
 
     void AcquireForegroundRights(Kernel::HLERequestContext& ctx) {
         LOG_WARNING(Service, "(STUBBED) called");
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
 };
@@ -86,14 +86,14 @@ private:
         };
         auto flags = rp.PopRaw<FocusHandlingModeParams>();
 
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
 
         LOG_WARNING(Service, "(STUBBED) called");
     }
 
     void SetRestartMessageEnabled(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
 
         LOG_WARNING(Service, "(STUBBED) called");
@@ -104,7 +104,7 @@ private:
 
         bool flag = rp.Pop<bool>();
 
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
 
         LOG_WARNING(Service, "(STUBBED) called flag=%u", static_cast<u32>(flag));
@@ -115,7 +115,7 @@ private:
 
         bool flag = rp.Pop<bool>();
 
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
 
         LOG_WARNING(Service, "(STUBBED) called flag=%u", static_cast<u32>(flag));
@@ -128,21 +128,21 @@ private:
 
         bool enabled = rp.Pop<bool>();
 
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
 
         LOG_WARNING(Service, "(STUBBED) called enabled=%u", static_cast<u32>(enabled));
     }
 
     void LockExit(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
 
         LOG_WARNING(Service, "(STUBBED) called");
     }
 
     void UnlockExit(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
 
         LOG_WARNING(Service, "(STUBBED) called");
@@ -154,7 +154,7 @@ private:
         u64 display_id = nvflinger->OpenDisplay("Default");
         u64 layer_id = nvflinger->CreateLayer(display_id);
 
-        IPC::RequestBuilder rb{ctx, 4};
+        IPC::ResponseBuilder rb{ctx, 4};
         rb.Push(RESULT_SUCCESS);
         rb.Push(layer_id);
 
@@ -193,7 +193,7 @@ private:
     void GetEventHandle(Kernel::HLERequestContext& ctx) {
         event->Signal();
 
-        IPC::RequestBuilder rb{ctx, 2, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 1};
         rb.Push(RESULT_SUCCESS);
         rb.PushCopyObjects(event);
 
@@ -201,7 +201,7 @@ private:
     }
 
     void ReceiveMessage(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 3};
+        IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);
         rb.Push<u32>(15);
 
@@ -209,7 +209,7 @@ private:
     }
 
     void GetCurrentFocusState(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 3};
+        IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);
         rb.Push(static_cast<u8>(FocusState::InFocus));
 
@@ -217,7 +217,7 @@ private:
     }
 
     void GetOperationMode(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 3};
+        IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);
         rb.Push(static_cast<u8>(OperationMode::Handheld));
 
@@ -225,7 +225,7 @@ private:
     }
 
     void GetPerformanceMode(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 3};
+        IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);
         rb.Push(static_cast<u32>(APM::PerformanceMode::Handheld));
 
@@ -250,7 +250,7 @@ private:
     std::vector<u8> buffer;
 
     void GetSize(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 4};
+        IPC::ResponseBuilder rb{ctx, 4};
 
         rb.Push(RESULT_SUCCESS);
         rb.Push(static_cast<u64>(buffer.size()));
@@ -269,7 +269,7 @@ private:
 
         Memory::WriteBlock(output_buffer.Address(), buffer.data() + offset, output_buffer.Size());
 
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
 
         rb.Push(RESULT_SUCCESS);
 
@@ -291,7 +291,7 @@ private:
     std::vector<u8> buffer;
 
     void Open(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
 
         rb.Push(RESULT_SUCCESS);
         rb.PushIpcInterface<AM::IStorageAccessor>(buffer);
@@ -328,7 +328,7 @@ private:
 
         std::vector<u8> buffer(data, data + sizeof(data));
 
-        IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
 
         rb.Push(RESULT_SUCCESS);
         rb.PushIpcInterface<AM::IStorage>(buffer);
@@ -343,34 +343,34 @@ private:
         IPC::RequestParser rp{ctx};
         u32 result = rp.Pop<u32>();
 
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
 
         LOG_WARNING(Service, "(STUBBED) called, result=0x%08X", result);
     }
 
     void GetDesiredLanguage(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 4};
+        IPC::ResponseBuilder rb{ctx, 4};
         rb.Push(RESULT_SUCCESS);
         rb.Push<u64>(SystemLanguage::English);
         LOG_WARNING(Service, "(STUBBED) called");
     }
 
     void InitializeGamePlayRecording(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
         LOG_WARNING(Service, "(STUBBED) called");
     }
 
     void SetGamePlayRecordingState(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
 
         LOG_WARNING(Service, "(STUBBED) called");
     }
 
     void NotifyRunning(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 3};
+        IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);
         rb.Push<u8>(0); // Unknown, seems to be ignored by official processes
 
@@ -402,56 +402,56 @@ public:
 
 private:
     void GetAudioController(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
         rb.Push(RESULT_SUCCESS);
         rb.PushIpcInterface<IAudioController>();
         LOG_DEBUG(Service, "called");
     }
 
     void GetDisplayController(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
         rb.Push(RESULT_SUCCESS);
         rb.PushIpcInterface<IDisplayController>();
         LOG_DEBUG(Service, "called");
     }
 
     void GetDebugFunctions(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
         rb.Push(RESULT_SUCCESS);
         rb.PushIpcInterface<IDebugFunctions>();
         LOG_DEBUG(Service, "called");
     }
 
     void GetWindowController(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
         rb.Push(RESULT_SUCCESS);
         rb.PushIpcInterface<IWindowController>();
         LOG_DEBUG(Service, "called");
     }
 
     void GetSelfController(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
         rb.Push(RESULT_SUCCESS);
         rb.PushIpcInterface<ISelfController>(nvflinger);
         LOG_DEBUG(Service, "called");
     }
 
     void GetCommonStateGetter(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
         rb.Push(RESULT_SUCCESS);
         rb.PushIpcInterface<ICommonStateGetter>();
         LOG_DEBUG(Service, "called");
     }
 
     void GetLibraryAppletCreator(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
         rb.Push(RESULT_SUCCESS);
         rb.PushIpcInterface<ILibraryAppletCreator>();
         LOG_DEBUG(Service, "called");
     }
 
     void GetApplicationFunctions(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
         rb.Push(RESULT_SUCCESS);
         rb.PushIpcInterface<IApplicationFunctions>();
         LOG_DEBUG(Service, "called");
@@ -461,7 +461,7 @@ private:
 };
 
 void AppletOE::OpenApplicationProxy(Kernel::HLERequestContext& ctx) {
-    IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
     rb.PushIpcInterface<IApplicationProxy>(nvflinger);
     LOG_DEBUG(Service, "called");
diff --git a/src/core/hle/service/apm/apm.cpp b/src/core/hle/service/apm/apm.cpp
index bf7e12288..c4b1723c5 100644
--- a/src/core/hle/service/apm/apm.cpp
+++ b/src/core/hle/service/apm/apm.cpp
@@ -30,7 +30,7 @@ private:
         auto mode = static_cast<PerformanceMode>(rp.Pop<u32>());
         u32 config = rp.Pop<u32>();
 
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
 
         LOG_WARNING(Service, "(STUBBED) called mode=%u config=%u", static_cast<u32>(mode), config);
@@ -41,7 +41,7 @@ private:
 
         auto mode = static_cast<PerformanceMode>(rp.Pop<u32>());
 
-        IPC::RequestBuilder rb{ctx, 3};
+        IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);
         rb.Push<u32>(0); // Performance configuration
 
@@ -58,7 +58,7 @@ APM::APM() : ServiceFramework("apm") {
 }
 
 void APM::OpenSession(Kernel::HLERequestContext& ctx) {
-    IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
     rb.PushIpcInterface<ISession>();
 }
diff --git a/src/core/hle/service/audio/audout_u.cpp b/src/core/hle/service/audio/audout_u.cpp
index df04d636e..f56ba2ea1 100644
--- a/src/core/hle/service/audio/audout_u.cpp
+++ b/src/core/hle/service/audio/audout_u.cpp
@@ -23,7 +23,7 @@ constexpr u64 audio_ticks{static_cast<u64>(BASE_CLOCK_RATE / 500)};
 
 class IAudioOut final : public ServiceFramework<IAudioOut> {
 public:
-    IAudioOut() : ServiceFramework("IAudioOut"), audio_out_state(Stopped) {
+    IAudioOut() : ServiceFramework("IAudioOut"), audio_out_state(AudioState::Stopped) {
         static const FunctionInfo functions[] = {
             {0x0, nullptr, "GetAudioOutState"},
             {0x1, &IAudioOut::StartAudioOut, "StartAudioOut"},
@@ -58,29 +58,29 @@ private:
     void StartAudioOut(Kernel::HLERequestContext& ctx) {
         LOG_WARNING(Service_Audio, "(STUBBED) called");
 
-        // start audio
-        audio_out_state = Started;
+        // Start audio
+        audio_out_state = AudioState::Started;
 
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
 
     void StopAudioOut(Kernel::HLERequestContext& ctx) {
         LOG_WARNING(Service_Audio, "(STUBBED) called");
 
-        // stop audio
-        audio_out_state = Stopped;
+        // Stop audio
+        audio_out_state = AudioState::Stopped;
 
         queue_keys.clear();
 
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
 
     void RegisterBufferEvent(Kernel::HLERequestContext& ctx) {
         LOG_WARNING(Service_Audio, "(STUBBED) called");
 
-        IPC::RequestBuilder rb{ctx, 2, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 1};
         rb.Push(RESULT_SUCCESS);
         rb.PushCopyObjects(buffer_event);
     }
@@ -89,11 +89,10 @@ private:
         LOG_WARNING(Service_Audio, "(STUBBED) called");
         IPC::RequestParser rp{ctx};
 
-        u64 key = rp.Pop<u64>();
-
+        const u64 key{rp.Pop<u64>()};
         queue_keys.insert(queue_keys.begin(), key);
 
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
 
@@ -102,11 +101,10 @@ private:
 
         const auto& buffer = ctx.BufferDescriptorB()[0];
 
-        // TODO(st4rk): this is how libtransistor currently implements the
-        // GetReleasedAudioOutBuffer, it should return the key (a VAddr) to the APP and this address
+        // TODO(st4rk): This is how libtransistor currently implements the
+        // GetReleasedAudioOutBuffer, it should return the key (a VAddr) to the app and this address
         // is used to know which buffer should be filled with data and send again to the service
         // through AppendAudioOutBuffer. Check if this is the proper way to do it.
-
         u64 key{0};
 
         if (queue_keys.size()) {
@@ -116,7 +114,7 @@ private:
 
         Memory::WriteBlock(buffer.Address(), &key, sizeof(u64));
 
-        IPC::RequestBuilder rb{ctx, 3};
+        IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);
         // TODO(st4rk): This might be the total of released buffers, needs to be verified on
         // hardware
@@ -124,8 +122,7 @@ private:
     }
 
     void UpdateAudioBuffersCallback() {
-
-        if (audio_out_state != Started) {
+        if (audio_out_state != AudioState::Started) {
             return;
         }
 
@@ -136,7 +133,7 @@ private:
         buffer_event->Signal();
     }
 
-    enum AudioState : u32 {
+    enum class AudioState : u32 {
         Started,
         Stopped,
     };
@@ -148,10 +145,10 @@ private:
     /// This is the evend handle used to check if the audio buffer was released
     Kernel::SharedPtr<Kernel::Event> buffer_event;
 
-    /// (st4rk): this is just a temporary workaround for the future implementation. Libtransistor
+    /// (st4rk): This is just a temporary workaround for the future implementation. Libtransistor
     /// uses the key as an address in the App, so we need to return when the
     /// GetReleasedAudioOutBuffer_1 is called, otherwise we'll run in problems, because
-    /// libtransistor uses the key returned as an pointer;
+    /// libtransistor uses the key returned as an pointer.
     std::vector<u64> queue_keys;
 
     AudioState audio_out_state;
@@ -166,14 +163,12 @@ void AudOutU::ListAudioOuts(Kernel::HLERequestContext& ctx) {
 
     Memory::WriteBlock(buffer.Address(), &audio_interface[0], audio_interface.size());
 
-    IPC::RequestBuilder rb = rp.MakeBuilder(3, 0, 0, 0);
+    IPC::ResponseBuilder rb = rp.MakeBuilder(3, 0, 0);
 
     rb.Push(RESULT_SUCCESS);
-    // TODO(st4rk): we're currently returning only one audio interface
-    // (stringlist size)
-    // however, it's highly possible to have more than one interface (despite that
-    // libtransistor
-    // requires only one).
+    // TODO(st4rk): We're currently returning only one audio interface (stringlist size). However,
+    // it's highly possible to have more than one interface (despite that libtransistor requires
+    // only one).
     rb.Push<u32>(1);
 }
 
@@ -184,20 +179,13 @@ void AudOutU::OpenAudioOut(Kernel::HLERequestContext& ctx) {
         audio_out_interface = std::make_shared<IAudioOut>();
     }
 
-    auto sessions = Kernel::ServerSession::CreateSessionPair(audio_out_interface->GetServiceName());
-    auto server = std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions);
-    auto client = std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions);
-    audio_out_interface->ClientConnected(server);
-    LOG_DEBUG(Service, "called, initialized IAudioOut -> session=%u", client->GetObjectId());
-    IPC::RequestBuilder rb{ctx, 6, 0, 1};
-
+    IPC::ResponseBuilder rb{ctx, 6, 0, 1};
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(sample_rate);
     rb.Push<u32>(audio_channels);
     rb.Push<u32>(static_cast<u32>(PcmFormat::Int16));
-    // this field is unknown
-    rb.Push<u32>(0);
-    rb.PushMoveObjects(std::move(client));
+    rb.Push<u32>(0); // This field is unknown
+    rb.PushIpcInterface<Audio::IAudioOut>(audio_out_interface);
 }
 
 AudOutU::AudOutU() : ServiceFramework("audout:u") {
diff --git a/src/core/hle/service/filesystem/fsp_srv.cpp b/src/core/hle/service/filesystem/fsp_srv.cpp
index ef1915e5a..71b82393e 100644
--- a/src/core/hle/service/filesystem/fsp_srv.cpp
+++ b/src/core/hle/service/filesystem/fsp_srv.cpp
@@ -40,12 +40,12 @@ private:
         // Error checking
         ASSERT_MSG(length == descriptor.Size(), "unexpected size difference");
         if (length < 0) {
-            IPC::RequestBuilder rb{ctx, 2};
+            IPC::ResponseBuilder rb{ctx, 2};
             rb.Push(ResultCode(ErrorModule::FS, ErrorDescription::InvalidLength));
             return;
         }
         if (offset < 0) {
-            IPC::RequestBuilder rb{ctx, 2};
+            IPC::ResponseBuilder rb{ctx, 2};
             rb.Push(ResultCode(ErrorModule::FS, ErrorDescription::InvalidOffset));
             return;
         }
@@ -54,7 +54,7 @@ private:
         std::vector<u8> output(length);
         ResultVal<size_t> res = backend->Read(offset, length, output.data());
         if (res.Failed()) {
-            IPC::RequestBuilder rb{ctx, 2};
+            IPC::ResponseBuilder rb{ctx, 2};
             rb.Push(res.Code());
             return;
         }
@@ -62,7 +62,7 @@ private:
         // Write the data to memory
         Memory::WriteBlock(descriptor.Address(), output.data(), descriptor.Size());
 
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
 };
@@ -91,14 +91,14 @@ void FSP_SRV::TryLoadRomFS() {
 void FSP_SRV::Initalize(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service_FS, "(STUBBED) called");
 
-    IPC::RequestBuilder rb{ctx, 2};
+    IPC::ResponseBuilder rb{ctx, 2};
     rb.Push(RESULT_SUCCESS);
 }
 
 void FSP_SRV::GetGlobalAccessLogMode(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service_FS, "(STUBBED) called");
 
-    IPC::RequestBuilder rb{ctx, 4};
+    IPC::ResponseBuilder rb{ctx, 3};
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(5);
 }
@@ -110,7 +110,7 @@ void FSP_SRV::OpenDataStorageByCurrentProcess(Kernel::HLERequestContext& ctx) {
     if (!romfs) {
         // TODO (bunnei): Find the right error code to use here
         LOG_CRITICAL(Service_FS, "no file system interface available!");
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(ResultCode(-1));
         return;
     }
@@ -119,12 +119,12 @@ void FSP_SRV::OpenDataStorageByCurrentProcess(Kernel::HLERequestContext& ctx) {
     auto storage = romfs->OpenFile({}, {});
     if (storage.Failed()) {
         LOG_CRITICAL(Service_FS, "no storage interface available!");
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(storage.Code());
         return;
     }
 
-    IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
     rb.PushIpcInterface<IStorage>(std::move(storage.Unwrap()));
 }
diff --git a/src/core/hle/service/hid/hid.cpp b/src/core/hle/service/hid/hid.cpp
index ae60cc7b4..326e0a4ab 100644
--- a/src/core/hle/service/hid/hid.cpp
+++ b/src/core/hle/service/hid/hid.cpp
@@ -46,7 +46,7 @@ public:
 
 private:
     void GetSharedMemoryHandle(Kernel::HLERequestContext& ctx) {
-        IPC::RequestBuilder rb{ctx, 2, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 1};
         rb.Push(RESULT_SUCCESS);
         rb.PushCopyObjects(shared_mem);
         LOG_DEBUG(Service, "called");
@@ -169,19 +169,10 @@ private:
             applet_resource = std::make_shared<IAppletResource>();
         }
 
-        // TODO(Subv): Verify if this should return the interface as a domain object when called
-        // from within a domain.
-
-        auto sessions = Kernel::ServerSession::CreateSessionPair(applet_resource->GetServiceName());
-        auto server = std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions);
-        auto client = std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions);
-        applet_resource->ClientConnected(server);
-
-        LOG_DEBUG(Service, "called, initialized IAppletResource -> session=%u",
-                  client->GetObjectId());
-        IPC::RequestBuilder rb{ctx, 2, 0, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 0, 1};
         rb.Push(RESULT_SUCCESS);
-        rb.PushMoveObjects(std::move(client));
+        rb.PushIpcInterface<IAppletResource>(applet_resource);
+        LOG_DEBUG(Service, "called");
     }
 };
 
diff --git a/src/core/hle/service/lm/lm.cpp b/src/core/hle/service/lm/lm.cpp
index b505cdcaf..2843e0e40 100644
--- a/src/core/hle/service/lm/lm.cpp
+++ b/src/core/hle/service/lm/lm.cpp
@@ -65,7 +65,7 @@ private:
      */
     void Log(Kernel::HLERequestContext& ctx) {
         // This function only succeeds - Get that out of the way
-        IPC::RequestBuilder rb{ctx, 1};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
 
         // Read MessageHeader, despite not doing anything with it right now
@@ -130,7 +130,7 @@ private:
         }
         output += message;
 
-        LOG_DEBUG(Debug_Emulated, "%s", output.c_str());
+        LOG_INFO(Debug_Emulated, "%s", output.c_str());
     }
 };
 
@@ -146,21 +146,11 @@ void InstallInterfaces(SM::ServiceManager& service_manager) {
  *      0: ResultCode
  */
 void LM::Initialize(Kernel::HLERequestContext& ctx) {
-    // TODO(Subv): Verify if this should return the interface as a domain object when called from
-    // within a domain.
-
-    auto logger = std::make_shared<Logger>();
-    auto sessions = Kernel::ServerSession::CreateSessionPair(logger->GetServiceName());
-    auto server = std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions);
-    auto client = std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions);
-    logger->ClientConnected(server);
-
-    LOG_DEBUG(Service_SM, "called, initialized logger -> session=%u", client->GetObjectId());
-    IPC::RequestBuilder rb{ctx, 2, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
-    rb.PushMoveObjects(std::move(client));
+    rb.PushIpcInterface<Logger>();
 
-    LOG_INFO(Service_SM, "called");
+    LOG_DEBUG(Service, "called");
 }
 
 LM::LM() : ServiceFramework("lm") {
diff --git a/src/core/hle/service/nvdrv/interface.cpp b/src/core/hle/service/nvdrv/interface.cpp
index 0181d1b4f..85ecde6d2 100644
--- a/src/core/hle/service/nvdrv/interface.cpp
+++ b/src/core/hle/service/nvdrv/interface.cpp
@@ -18,7 +18,7 @@ void NVDRV::Open(Kernel::HLERequestContext& ctx) {
     std::string device_name = Memory::ReadCString(buffer.Address(), buffer.Size());
 
     u32 fd = nvdrv->Open(device_name);
-    IPC::RequestBuilder rb{ctx, 4};
+    IPC::ResponseBuilder rb{ctx, 4};
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(fd);
     rb.Push<u32>(0);
@@ -43,7 +43,7 @@ void NVDRV::Ioctl(Kernel::HLERequestContext& ctx) {
 
     Memory::WriteBlock(output_buffer.Address(), output.data(), output_buffer.Size());
 
-    IPC::RequestBuilder rb{ctx, 3};
+    IPC::ResponseBuilder rb{ctx, 3};
     rb.Push(RESULT_SUCCESS);
     rb.Push(nv_result);
 }
@@ -56,13 +56,13 @@ void NVDRV::Close(Kernel::HLERequestContext& ctx) {
 
     auto result = nvdrv->Close(fd);
 
-    IPC::RequestBuilder rb{ctx, 2};
+    IPC::ResponseBuilder rb{ctx, 2};
     rb.Push(result);
 }
 
 void NVDRV::Initialize(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service, "(STUBBED) called");
-    IPC::RequestBuilder rb{ctx, 3};
+    IPC::ResponseBuilder rb{ctx, 3};
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(0);
 }
@@ -72,7 +72,7 @@ void NVDRV::SetClientPID(Kernel::HLERequestContext& ctx) {
     pid = rp.Pop<u64>();
 
     LOG_INFO(Service, "called, pid=0x%lx", pid);
-    IPC::RequestBuilder rb{ctx, 3};
+    IPC::ResponseBuilder rb{ctx, 3};
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(0);
 }
diff --git a/src/core/hle/service/pctl/pctl_a.cpp b/src/core/hle/service/pctl/pctl_a.cpp
index 7978aecb8..c808b764b 100644
--- a/src/core/hle/service/pctl/pctl_a.cpp
+++ b/src/core/hle/service/pctl/pctl_a.cpp
@@ -15,7 +15,7 @@ public:
 };
 
 void PCTL_A::GetService(Kernel::HLERequestContext& ctx) {
-    IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
     rb.PushIpcInterface<IParentalControlService>();
     LOG_DEBUG(Service, "called");
diff --git a/src/core/hle/service/service.cpp b/src/core/hle/service/service.cpp
index 1b8565351..294351b76 100644
--- a/src/core/hle/service/service.cpp
+++ b/src/core/hle/service/service.cpp
@@ -132,7 +132,7 @@ void ServiceFrameworkBase::InvokeRequest(Kernel::HLERequestContext& ctx) {
 ResultCode ServiceFrameworkBase::HandleSyncRequest(Kernel::HLERequestContext& context) {
     switch (context.GetCommandType()) {
     case IPC::CommandType::Close: {
-        IPC::RequestBuilder rb{context, 1};
+        IPC::ResponseBuilder rb{context, 2};
         rb.Push(RESULT_SUCCESS);
         return ResultCode(ErrorModule::HIPC, ErrorDescription::RemoteProcessDead);
     }
diff --git a/src/core/hle/service/set/set.cpp b/src/core/hle/service/set/set.cpp
index 3715acd74..e0e157fe1 100644
--- a/src/core/hle/service/set/set.cpp
+++ b/src/core/hle/service/set/set.cpp
@@ -19,7 +19,7 @@ void SET::GetAvailableLanguageCodes(Kernel::HLERequestContext& ctx) {
 
     Memory::WriteBlock(output_buffer.Address(), lang_codes.data(), lang_codes.size());
 
-    IPC::RequestBuilder rb{ctx, 4};
+    IPC::ResponseBuilder rb{ctx, 4};
 
     rb.Push(RESULT_SUCCESS);
     rb.Push(static_cast<u64>(lang_codes.size()));
diff --git a/src/core/hle/service/sm/controller.cpp b/src/core/hle/service/sm/controller.cpp
index 7b1c8ee37..a81ff9f49 100644
--- a/src/core/hle/service/sm/controller.cpp
+++ b/src/core/hle/service/sm/controller.cpp
@@ -4,30 +4,26 @@
 
 #include "common/logging/log.h"
 #include "core/hle/ipc_helpers.h"
-#include "core/hle/kernel/domain.h"
 #include "core/hle/service/sm/controller.h"
 
 namespace Service {
 namespace SM {
 
 void Controller::ConvertSessionToDomain(Kernel::HLERequestContext& ctx) {
-    auto domain = Kernel::Domain::CreateFromSession(*ctx.ServerSession()->parent).Unwrap();
+    ASSERT_MSG(!ctx.Session()->IsDomain(), "session is alread a domain");
+    ctx.Session()->ConvertToDomain();
 
-    IPC::RequestBuilder rb{ctx, 3};
+    IPC::ResponseBuilder rb{ctx, 3};
     rb.Push(RESULT_SUCCESS);
-    rb.Push(static_cast<u32>(domain->request_handlers.size()));
+    rb.Push<u32>(1); // Converted sessions start with 1 request handler
 
-    LOG_DEBUG(Service, "called, domain=%d", domain->GetObjectId());
+    LOG_DEBUG(Service, "called, server_session=%d", ctx.Session()->GetObjectId());
 }
 
 void Controller::DuplicateSession(Kernel::HLERequestContext& ctx) {
-    IPC::RequestBuilder rb{ctx, 2, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1, IPC::ResponseBuilder::Flags::AlwaysMoveHandles};
     rb.Push(RESULT_SUCCESS);
-    // TODO(Subv): Check if this is correct
-    if (ctx.IsDomain())
-        rb.PushMoveObjects(ctx.Domain());
-    else
-        rb.PushMoveObjects(ctx.ServerSession());
+    rb.PushMoveObjects(ctx.Session());
 
     LOG_DEBUG(Service, "called");
 }
@@ -39,7 +35,7 @@ void Controller::DuplicateSessionEx(Kernel::HLERequestContext& ctx) {
 }
 
 void Controller::QueryPointerBufferSize(Kernel::HLERequestContext& ctx) {
-    IPC::RequestBuilder rb{ctx, 3};
+    IPC::ResponseBuilder rb{ctx, 3};
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(0x500);
 
diff --git a/src/core/hle/service/sm/sm.cpp b/src/core/hle/service/sm/sm.cpp
index c4078f02f..73aa013e3 100644
--- a/src/core/hle/service/sm/sm.cpp
+++ b/src/core/hle/service/sm/sm.cpp
@@ -83,7 +83,7 @@ std::shared_ptr<ServiceManager> g_service_manager;
  *      0: ResultCode
  */
 void SM::Initialize(Kernel::HLERequestContext& ctx) {
-    IPC::RequestBuilder rb{ctx, 1};
+    IPC::ResponseBuilder rb{ctx, 2};
     rb.Push(RESULT_SUCCESS);
     LOG_DEBUG(Service_SM, "called");
 }
@@ -99,7 +99,7 @@ void SM::GetService(Kernel::HLERequestContext& ctx) {
 
     auto client_port = service_manager->GetServicePort(name);
     if (client_port.Failed()) {
-        IPC::RequestBuilder rb = rp.MakeBuilder(2, 0, 0, 0);
+        IPC::ResponseBuilder rb = rp.MakeBuilder(2, 0, 0);
         rb.Push(client_port.Code());
         LOG_ERROR(Service_SM, "called service=%s -> error 0x%08X", name.c_str(),
                   client_port.Code().raw);
@@ -112,7 +112,8 @@ void SM::GetService(Kernel::HLERequestContext& ctx) {
     if (session.Succeeded()) {
         LOG_DEBUG(Service_SM, "called service=%s -> session=%u", name.c_str(),
                   (*session)->GetObjectId());
-        IPC::RequestBuilder rb = rp.MakeBuilder(2, 0, 1, 0);
+        IPC::ResponseBuilder rb =
+            rp.MakeBuilder(2, 0, 1, IPC::ResponseBuilder::Flags::AlwaysMoveHandles);
         rb.Push(session.Code());
         rb.PushMoveObjects(std::move(session).Unwrap());
     }
diff --git a/src/core/hle/service/sockets/bsd_u.cpp b/src/core/hle/service/sockets/bsd_u.cpp
index a819acc96..4fd960bd8 100644
--- a/src/core/hle/service/sockets/bsd_u.cpp
+++ b/src/core/hle/service/sockets/bsd_u.cpp
@@ -11,7 +11,7 @@ namespace Sockets {
 void BSD_U::RegisterClient(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service, "(STUBBED) called");
 
-    IPC::RequestBuilder rb{ctx, 3};
+    IPC::ResponseBuilder rb{ctx, 3};
 
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(0); // bsd errno
@@ -28,7 +28,7 @@ void BSD_U::Socket(Kernel::HLERequestContext& ctx) {
 
     u32 fd = next_fd++;
 
-    IPC::RequestBuilder rb{ctx, 4};
+    IPC::ResponseBuilder rb{ctx, 4};
 
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(fd);
@@ -38,7 +38,7 @@ void BSD_U::Socket(Kernel::HLERequestContext& ctx) {
 void BSD_U::Connect(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service, "(STUBBED) called");
 
-    IPC::RequestBuilder rb{ctx, 4};
+    IPC::ResponseBuilder rb{ctx, 4};
 
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(0); // ret
@@ -48,7 +48,7 @@ void BSD_U::Connect(Kernel::HLERequestContext& ctx) {
 void BSD_U::SendTo(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service, "(STUBBED) called");
 
-    IPC::RequestBuilder rb{ctx, 4};
+    IPC::ResponseBuilder rb{ctx, 4};
 
     rb.Push(RESULT_SUCCESS);
     rb.Push<u32>(0); // ret
diff --git a/src/core/hle/service/time/time.cpp b/src/core/hle/service/time/time.cpp
index 448ef8544..96ccee50d 100644
--- a/src/core/hle/service/time/time.cpp
+++ b/src/core/hle/service/time/time.cpp
@@ -19,7 +19,7 @@ public:
     ISystemClock() : ServiceFramework("ISystemClock") {
         static const FunctionInfo functions[] = {
             {0, &ISystemClock::GetCurrentTime, "GetCurrentTime"},
-        };
+            {2, &ISystemClock::GetSystemClockContext, "GetSystemClockContext"}};
         RegisterHandlers(functions);
     }
 
@@ -28,10 +28,18 @@ private:
         const s64 time_since_epoch{std::chrono::duration_cast<std::chrono::seconds>(
                                        std::chrono::system_clock::now().time_since_epoch())
                                        .count()};
-        IPC::RequestBuilder rb{ctx, 4};
+        LOG_DEBUG(Service, "called");
+        IPC::ResponseBuilder rb{ctx, 4};
         rb.Push(RESULT_SUCCESS);
         rb.Push<u64>(time_since_epoch);
-        LOG_DEBUG(Service, "called");
+    }
+
+    void GetSystemClockContext(Kernel::HLERequestContext& ctx) {
+        LOG_WARNING(Service, "(STUBBED) called");
+        SystemClockContext system_clock_ontext{};
+        IPC::ResponseBuilder rb{ctx, (sizeof(SystemClockContext) / 4) + 2};
+        rb.Push(RESULT_SUCCESS);
+        rb.PushRaw(system_clock_ontext);
     }
 };
 
@@ -55,14 +63,14 @@ private:
     void GetDeviceLocationName(Kernel::HLERequestContext& ctx) {
         LOG_WARNING(Service, "(STUBBED) called");
         LocationName location_name{};
-        IPC::RequestBuilder rb{ctx, (sizeof(LocationName) / 4) + 2};
+        IPC::ResponseBuilder rb{ctx, (sizeof(LocationName) / 4) + 2};
         rb.Push(RESULT_SUCCESS);
         rb.PushRaw(location_name);
     }
 
     void GetTotalLocationNameCount(Kernel::HLERequestContext& ctx) {
         LOG_WARNING(Service, "(STUBBED) called");
-        IPC::RequestBuilder rb{ctx, 3};
+        IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(RESULT_SUCCESS);
         rb.Push<u32>(0);
     }
@@ -75,7 +83,7 @@ private:
 
         CalendarTime calendar_time{2018, 1, 1, 0, 0, 0};
         CalendarAdditionalInfo additional_info{};
-        IPC::RequestBuilder rb{ctx, 10};
+        IPC::ResponseBuilder rb{ctx, 10};
         rb.Push(RESULT_SUCCESS);
         rb.PushRaw(calendar_time);
         rb.PushRaw(additional_info);
@@ -83,49 +91,28 @@ private:
 };
 
 void Module::Interface::GetStandardUserSystemClock(Kernel::HLERequestContext& ctx) {
-    // TODO(Subv): Verify if this should return the interface as a domain object when called from
-    // within a domain.
-    auto system_clock = std::make_shared<ISystemClock>();
-    auto sessions = Kernel::ServerSession::CreateSessionPair(system_clock->GetServiceName());
-    auto server = std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions);
-    auto client = std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions);
-    system_clock->ClientConnected(server);
-    LOG_DEBUG(Service, "called, initialized ISystemClock -> session=%u", client->GetObjectId());
-    IPC::RequestBuilder rb{ctx, 2, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
-    rb.PushMoveObjects(std::move(client));
+    rb.PushIpcInterface<ISystemClock>();
+    LOG_DEBUG(Service, "called");
 }
 
 void Module::Interface::GetStandardNetworkSystemClock(Kernel::HLERequestContext& ctx) {
-    // TODO(Subv): Verify if this should return the interface as a domain object when called from
-    // within a domain.
-    auto system_clock = std::make_shared<ISystemClock>();
-    auto sessions = Kernel::ServerSession::CreateSessionPair(system_clock->GetServiceName());
-    auto server = std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions);
-    auto client = std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions);
-    system_clock->ClientConnected(server);
-    LOG_DEBUG(Service, "called, initialized ISystemClock -> session=%u", client->GetObjectId());
-    IPC::RequestBuilder rb{ctx, 2, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
-    rb.PushMoveObjects(std::move(client));
+    rb.PushIpcInterface<ISystemClock>();
+    LOG_DEBUG(Service, "called");
 }
 
 void Module::Interface::GetStandardSteadyClock(Kernel::HLERequestContext& ctx) {
-    // TODO(Subv): Verify if this should return the interface as a domain object when called from
-    // within a domain.
-    auto steady_clock = std::make_shared<ISteadyClock>();
-    auto sessions = Kernel::ServerSession::CreateSessionPair(steady_clock->GetServiceName());
-    auto server = std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions);
-    auto client = std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions);
-    steady_clock->ClientConnected(server);
-    LOG_DEBUG(Service, "called, initialized ISteadyClock -> session=%u", client->GetObjectId());
-    IPC::RequestBuilder rb{ctx, 2, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
-    rb.PushMoveObjects(std::move(client));
+    rb.PushIpcInterface<ISteadyClock>();
+    LOG_DEBUG(Service, "called");
 }
 
 void Module::Interface::GetTimeZoneService(Kernel::HLERequestContext& ctx) {
-    IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
     rb.PushIpcInterface<ITimeZoneService>();
     LOG_DEBUG(Service, "called");
diff --git a/src/core/hle/service/time/time.h b/src/core/hle/service/time/time.h
index 399f474d6..cd936a50c 100644
--- a/src/core/hle/service/time/time.h
+++ b/src/core/hle/service/time/time.h
@@ -33,6 +33,13 @@ struct CalendarAdditionalInfo {
 static_assert(sizeof(CalendarAdditionalInfo) == 0x18,
               "CalendarAdditionalInfo structure has incorrect size");
 
+// TODO(bunnei) RE this structure
+struct SystemClockContext {
+    INSERT_PADDING_BYTES(0x20);
+};
+static_assert(sizeof(SystemClockContext) == 0x20,
+              "SystemClockContext structure has incorrect size");
+
 class Module final {
 public:
     class Interface : public ServiceFramework<Interface> {
diff --git a/src/core/hle/service/vi/vi.cpp b/src/core/hle/service/vi/vi.cpp
index 6576f81db..3b993f36c 100644
--- a/src/core/hle/service/vi/vi.cpp
+++ b/src/core/hle/service/vi/vi.cpp
@@ -486,7 +486,7 @@ private:
         }
 
         LOG_WARNING(Service, "(STUBBED) called");
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
 
@@ -497,7 +497,7 @@ private:
         u32 type = rp.Pop<u32>();
 
         LOG_WARNING(Service, "(STUBBED) called id=%u, addval=%08X, type=%08X", id, addval, type);
-        IPC::RequestBuilder rb{ctx, 2};
+        IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
 
@@ -511,7 +511,7 @@ private:
         // TODO(Subv): Find out what this actually is.
 
         LOG_WARNING(Service, "(STUBBED) called id=%u, unknown=%08X", id, unknown);
-        IPC::RequestBuilder rb{ctx, 2, 1};
+        IPC::ResponseBuilder rb{ctx, 2, 1};
         rb.Push(RESULT_SUCCESS);
         rb.PushCopyObjects(buffer_queue->GetNativeHandle());
     }
@@ -537,7 +537,7 @@ private:
         u64 layer_id = rp.Pop<u64>();
         u64 z_value = rp.Pop<u64>();
 
-        IPC::RequestBuilder rb = rp.MakeBuilder(2, 0, 0, 0);
+        IPC::ResponseBuilder rb = rp.MakeBuilder(2, 0, 0);
         rb.Push(RESULT_SUCCESS);
     }
 };
@@ -562,7 +562,7 @@ private:
         IPC::RequestParser rp{ctx};
         u64 display = rp.Pop<u64>();
 
-        IPC::RequestBuilder rb = rp.MakeBuilder(2, 0, 0, 0);
+        IPC::ResponseBuilder rb = rp.MakeBuilder(2, 0, 0);
         rb.Push(RESULT_SUCCESS);
     }
 
@@ -576,7 +576,7 @@ private:
 
         u64 layer_id = nv_flinger->CreateLayer(display);
 
-        IPC::RequestBuilder rb = rp.MakeBuilder(4, 0, 0, 0);
+        IPC::ResponseBuilder rb = rp.MakeBuilder(4, 0, 0);
         rb.Push(RESULT_SUCCESS);
         rb.Push(layer_id);
     }
@@ -587,7 +587,7 @@ private:
         u32 stack = rp.Pop<u32>();
         u64 layer_id = rp.Pop<u64>();
 
-        IPC::RequestBuilder rb = rp.MakeBuilder(2, 0, 0, 0);
+        IPC::ResponseBuilder rb = rp.MakeBuilder(2, 0, 0);
         rb.Push(RESULT_SUCCESS);
     }
 
@@ -597,7 +597,7 @@ private:
 void IApplicationDisplayService::GetRelayService(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service, "(STUBBED) called");
 
-    IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
     rb.PushIpcInterface<IHOSBinderDriver>(nv_flinger);
 }
@@ -605,7 +605,7 @@ void IApplicationDisplayService::GetRelayService(Kernel::HLERequestContext& ctx)
 void IApplicationDisplayService::GetSystemDisplayService(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service, "(STUBBED) called");
 
-    IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
     rb.PushIpcInterface<ISystemDisplayService>();
 }
@@ -613,7 +613,7 @@ void IApplicationDisplayService::GetSystemDisplayService(Kernel::HLERequestConte
 void IApplicationDisplayService::GetManagerDisplayService(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service, "(STUBBED) called");
 
-    IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
     rb.PushIpcInterface<IManagerDisplayService>(nv_flinger);
 }
@@ -622,7 +622,7 @@ void IApplicationDisplayService::GetIndirectDisplayTransactionService(
     Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service, "(STUBBED) called");
 
-    IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
     rb.Push(RESULT_SUCCESS);
     rb.PushIpcInterface<IHOSBinderDriver>(nv_flinger);
 }
@@ -637,7 +637,7 @@ void IApplicationDisplayService::OpenDisplay(Kernel::HLERequestContext& ctx) {
 
     ASSERT_MSG(name == "Default", "Non-default displays aren't supported yet");
 
-    IPC::RequestBuilder rb = rp.MakeBuilder(4, 0, 0, 0);
+    IPC::ResponseBuilder rb = rp.MakeBuilder(4, 0, 0);
     rb.Push(RESULT_SUCCESS);
     rb.Push<u64>(nv_flinger->OpenDisplay(name));
 }
@@ -647,7 +647,7 @@ void IApplicationDisplayService::CloseDisplay(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     u64 display_id = rp.Pop<u64>();
 
-    IPC::RequestBuilder rb = rp.MakeBuilder(4, 0, 0, 0);
+    IPC::ResponseBuilder rb = rp.MakeBuilder(4, 0, 0);
     rb.Push(RESULT_SUCCESS);
 }
 
@@ -671,7 +671,7 @@ void IApplicationDisplayService::OpenLayer(Kernel::HLERequestContext& ctx) {
     auto data = native_window.Serialize();
     Memory::WriteBlock(buffer.Address(), data.data(), data.size());
 
-    IPC::RequestBuilder rb = rp.MakeBuilder(4, 0, 0, 0);
+    IPC::ResponseBuilder rb = rp.MakeBuilder(4, 0, 0);
     rb.Push(RESULT_SUCCESS);
     rb.Push<u64>(data.size());
 }
@@ -694,7 +694,7 @@ void IApplicationDisplayService::CreateStrayLayer(Kernel::HLERequestContext& ctx
     auto data = native_window.Serialize();
     Memory::WriteBlock(buffer.Address(), data.data(), data.size());
 
-    IPC::RequestBuilder rb = rp.MakeBuilder(6, 0, 0, 0);
+    IPC::ResponseBuilder rb = rp.MakeBuilder(6, 0, 0);
     rb.Push(RESULT_SUCCESS);
     rb.Push(layer_id);
     rb.Push<u64>(data.size());
@@ -706,7 +706,7 @@ void IApplicationDisplayService::DestroyStrayLayer(Kernel::HLERequestContext& ct
     IPC::RequestParser rp{ctx};
     u64 layer_id = rp.Pop<u64>();
 
-    IPC::RequestBuilder rb = rp.MakeBuilder(2, 0, 0, 0);
+    IPC::ResponseBuilder rb = rp.MakeBuilder(2, 0, 0);
     rb.Push(RESULT_SUCCESS);
 }
 
@@ -716,7 +716,7 @@ void IApplicationDisplayService::SetLayerScalingMode(Kernel::HLERequestContext&
     u32 scaling_mode = rp.Pop<u32>();
     u64 unknown = rp.Pop<u64>();
 
-    IPC::RequestBuilder rb = rp.MakeBuilder(2, 0, 0, 0);
+    IPC::ResponseBuilder rb = rp.MakeBuilder(2, 0, 0);
     rb.Push(RESULT_SUCCESS);
 }
 
@@ -727,7 +727,7 @@ void IApplicationDisplayService::GetDisplayVsyncEvent(Kernel::HLERequestContext&
 
     auto vsync_event = nv_flinger->GetVsyncEvent(display_id);
 
-    IPC::RequestBuilder rb = rp.MakeBuilder(2, 1, 0, 0);
+    IPC::ResponseBuilder rb = rp.MakeBuilder(2, 1, 0);
     rb.Push(RESULT_SUCCESS);
     rb.PushCopyObjects(vsync_event);
 }
diff --git a/src/core/hle/service/vi/vi_m.cpp b/src/core/hle/service/vi/vi_m.cpp
index 20b24658e..bb440cadb 100644
--- a/src/core/hle/service/vi/vi_m.cpp
+++ b/src/core/hle/service/vi/vi_m.cpp
@@ -13,7 +13,8 @@ namespace VI {
 void VI_M::GetDisplayService(Kernel::HLERequestContext& ctx) {
     LOG_WARNING(Service, "(STUBBED) called");
 
-    IPC::RequestBuilder rb{ctx, 2, 0, 0, 1};
+    IPC::ResponseBuilder rb{ctx, 2, 0, 1};
+    rb.Push(RESULT_SUCCESS);
     rb.PushIpcInterface<IApplicationDisplayService>(nv_flinger);
 }