Merge pull request #4847 from zhaowenlan1779/ipc-debugger

core, citra_qt: IPC Recorder

src/core/hle/kernel/hle_ipc.cpp

@@ -10,6 +10,7 @@
 #include "core/hle/kernel/event.h"
 #include "core/hle/kernel/handle_table.h"
 #include "core/hle/kernel/hle_ipc.h"
+#include "core/hle/kernel/ipc_debugger/recorder.h"
 #include "core/hle/kernel/kernel.h"
 #include "core/hle/kernel/process.h"
 
@@ -107,6 +108,13 @@ ResultCode HLERequestContext::PopulateFromIncomingCommandBuffer(const u32_le* sr
 
     std::copy_n(src_cmdbuf, untranslated_size, cmd_buf.begin());
 
+    const bool should_record = kernel.GetIPCRecorder().IsEnabled();
+
+    std::vector<u32> untranslated_cmdbuf;
+    if (should_record) {
+        untranslated_cmdbuf = std::vector<u32>{src_cmdbuf, src_cmdbuf + command_size};
+    }
+
     std::size_t i = untranslated_size;
     while (i < command_size) {
         u32 descriptor = cmd_buf[i] = src_cmdbuf[i];
@@ -160,6 +168,12 @@ ResultCode HLERequestContext::PopulateFromIncomingCommandBuffer(const u32_le* sr
         }
     }
 
+    if (should_record) {
+        std::vector<u32> translated_cmdbuf{cmd_buf.begin(), cmd_buf.begin() + command_size};
+        kernel.GetIPCRecorder().SetRequestInfo(SharedFrom(thread), std::move(untranslated_cmdbuf),
+                                               std::move(translated_cmdbuf));
+    }
+
     return RESULT_SUCCESS;
 }
 
@@ -173,6 +187,13 @@ ResultCode HLERequestContext::WriteToOutgoingCommandBuffer(u32_le* dst_cmdbuf,
 
     std::copy_n(cmd_buf.begin(), untranslated_size, dst_cmdbuf);
 
+    const bool should_record = kernel.GetIPCRecorder().IsEnabled();
+
+    std::vector<u32> untranslated_cmdbuf;
+    if (should_record) {
+        untranslated_cmdbuf = std::vector<u32>{cmd_buf.begin(), cmd_buf.begin() + command_size};
+    }
+
     std::size_t i = untranslated_size;
     while (i < command_size) {
         u32 descriptor = dst_cmdbuf[i] = cmd_buf[i];
@@ -225,6 +246,12 @@ ResultCode HLERequestContext::WriteToOutgoingCommandBuffer(u32_le* dst_cmdbuf,
         }
     }
 
+    if (should_record) {
+        std::vector<u32> translated_cmdbuf{dst_cmdbuf, dst_cmdbuf + command_size};
+        kernel.GetIPCRecorder().SetReplyInfo(SharedFrom(thread), std::move(untranslated_cmdbuf),
+                                             std::move(translated_cmdbuf));
+    }
+
     return RESULT_SUCCESS;
 }
 
@@ -233,6 +260,12 @@ MappedBuffer& HLERequestContext::GetMappedBuffer(u32 id_from_cmdbuf) {
     return request_mapped_buffers[id_from_cmdbuf];
 }
 
+void HLERequestContext::ReportUnimplemented() const {
+    if (kernel.GetIPCRecorder().IsEnabled()) {
+        kernel.GetIPCRecorder().SetHLEUnimplemented(SharedFrom(thread));
+    }
+}
+
 MappedBuffer::MappedBuffer(Memory::MemorySystem& memory, const Process& process, u32 descriptor,
                            VAddr address, u32 id)
     : memory(&memory), id(id), address(address), process(&process) {

src/core/hle/kernel/hle_ipc.h

@@ -234,6 +234,9 @@ public:
     /// Writes data from this context back to the requesting process/thread.
     ResultCode WriteToOutgoingCommandBuffer(u32_le* dst_cmdbuf, Process& dst_process) const;
 
+    /// Reports an unimplemented function.
+    void ReportUnimplemented() const;
+
 private:
     KernelSystem& kernel;
     std::array<u32, IPC::COMMAND_BUFFER_LENGTH> cmd_buf;

src/core/hle/kernel/ipc.cpp

@@ -8,6 +8,7 @@
 #include "core/hle/ipc.h"
 #include "core/hle/kernel/handle_table.h"
 #include "core/hle/kernel/ipc.h"
+#include "core/hle/kernel/ipc_debugger/recorder.h"
 #include "core/hle/kernel/kernel.h"
 #include "core/hle/kernel/memory.h"
 #include "core/hle/kernel/process.h"
@@ -16,7 +17,8 @@
 
 namespace Kernel {
 
-ResultCode TranslateCommandBuffer(Memory::MemorySystem& memory, std::shared_ptr<Thread> src_thread,
+ResultCode TranslateCommandBuffer(Kernel::KernelSystem& kernel, Memory::MemorySystem& memory,
+                                  std::shared_ptr<Thread> src_thread,
                                   std::shared_ptr<Thread> dst_thread, VAddr src_address,
                                   VAddr dst_address,
                                   std::vector<MappedBufferContext>& mapped_buffer_context,
@@ -37,6 +39,13 @@ ResultCode TranslateCommandBuffer(Memory::MemorySystem& memory, std::shared_ptr<
     std::array<u32, IPC::COMMAND_BUFFER_LENGTH> cmd_buf;
     memory.ReadBlock(*src_process, src_address, cmd_buf.data(), command_size * sizeof(u32));
 
+    const bool should_record = kernel.GetIPCRecorder().IsEnabled();
+
+    std::vector<u32> untranslated_cmdbuf;
+    if (should_record) {
+        untranslated_cmdbuf = std::vector<u32>{cmd_buf.begin(), cmd_buf.begin() + command_size};
+    }
+
     std::size_t i = untranslated_size;
     while (i < command_size) {
         u32 descriptor = cmd_buf[i];
@@ -218,6 +227,17 @@ ResultCode TranslateCommandBuffer(Memory::MemorySystem& memory, std::shared_ptr<
         }
     }
 
+    if (should_record) {
+        std::vector<u32> translated_cmdbuf{cmd_buf.begin(), cmd_buf.begin() + command_size};
+        if (reply) {
+            kernel.GetIPCRecorder().SetReplyInfo(dst_thread, std::move(untranslated_cmdbuf),
+                                                 std::move(translated_cmdbuf));
+        } else {
+            kernel.GetIPCRecorder().SetRequestInfo(src_thread, std::move(untranslated_cmdbuf),
+                                                   std::move(translated_cmdbuf), dst_thread);
+        }
+    }
+
     memory.WriteBlock(*dst_process, dst_address, cmd_buf.data(), command_size * sizeof(u32));
 
     return RESULT_SUCCESS;

src/core/hle/kernel/ipc.h

@@ -16,6 +16,8 @@ class MemorySystem;
 
 namespace Kernel {
 
+class KernelSystem;
+
 struct MappedBufferContext {
     IPC::MappedBufferPermissions permissions;
     u32 size;
@@ -27,7 +29,8 @@ struct MappedBufferContext {
 };
 
 /// Performs IPC command buffer translation from one process to another.
-ResultCode TranslateCommandBuffer(Memory::MemorySystem& memory, std::shared_ptr<Thread> src_thread,
+ResultCode TranslateCommandBuffer(KernelSystem& system, Memory::MemorySystem& memory,
+                                  std::shared_ptr<Thread> src_thread,
                                   std::shared_ptr<Thread> dst_thread, VAddr src_address,
                                   VAddr dst_address,
                                   std::vector<MappedBufferContext>& mapped_buffer_context,

src/core/hle/kernel/ipc_debugger/recorder.cpp

@@ -0,0 +1,165 @@
+// Copyright 2019 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/assert.h"
+#include "common/logging/log.h"
+#include "core/hle/kernel/client_port.h"
+#include "core/hle/kernel/client_session.h"
+#include "core/hle/kernel/ipc_debugger/recorder.h"
+#include "core/hle/kernel/process.h"
+#include "core/hle/kernel/server_port.h"
+#include "core/hle/kernel/server_session.h"
+#include "core/hle/kernel/session.h"
+#include "core/hle/kernel/thread.h"
+#include "core/hle/service/service.h"
+
+namespace IPCDebugger {
+
+namespace {
+ObjectInfo GetObjectInfo(const Kernel::Object* object) {
+    if (object == nullptr) {
+        return {};
+    }
+    return {object->GetTypeName(), object->GetName(), static_cast<int>(object->GetObjectId())};
+}
+
+ObjectInfo GetObjectInfo(const Kernel::Thread* thread) {
+    if (thread == nullptr) {
+        return {};
+    }
+    return {thread->GetTypeName(), thread->GetName(), static_cast<int>(thread->GetThreadId())};
+}
+
+ObjectInfo GetObjectInfo(const Kernel::Process* process) {
+    if (process == nullptr) {
+        return {};
+    }
+    return {process->GetTypeName(), process->GetName(), static_cast<int>(process->process_id)};
+}
+} // namespace
+
+Recorder::Recorder() = default;
+Recorder::~Recorder() = default;
+
+bool Recorder::IsEnabled() const {
+    return enabled.load(std::memory_order_relaxed);
+}
+
+void Recorder::RegisterRequest(const std::shared_ptr<Kernel::ClientSession>& client_session,
+                               const std::shared_ptr<Kernel::Thread>& client_thread) {
+    const u32 thread_id = client_thread->GetThreadId();
+
+    RequestRecord record = {/* id */ ++record_count,
+                            /* status */ RequestStatus::Sent,
+                            /* client_process */ GetObjectInfo(client_thread->owner_process),
+                            /* client_thread */ GetObjectInfo(client_thread.get()),
+                            /* client_session */ GetObjectInfo(client_session.get()),
+                            /* client_port */ GetObjectInfo(client_session->parent->port.get()),
+                            /* server_process */ {},
+                            /* server_thread */ {},
+                            /* server_session */ GetObjectInfo(client_session->parent->server)};
+    record_map.insert_or_assign(thread_id, std::make_unique<RequestRecord>(record));
+    client_session_map.insert_or_assign(thread_id, client_session);
+
+    InvokeCallbacks(record);
+}
+
+void Recorder::SetRequestInfo(const std::shared_ptr<Kernel::Thread>& client_thread,
+                              std::vector<u32> untranslated_cmdbuf,
+                              std::vector<u32> translated_cmdbuf,
+                              const std::shared_ptr<Kernel::Thread>& server_thread) {
+    const u32 thread_id = client_thread->GetThreadId();
+    if (!record_map.count(thread_id)) {
+        // This is possible when the recorder is enabled after application started
+        LOG_ERROR(Kernel, "No request is assoicated with the thread");
+        return;
+    }
+
+    auto& record = *record_map[thread_id];
+    record.status = RequestStatus::Handling;
+    record.untranslated_request_cmdbuf = std::move(untranslated_cmdbuf);
+    record.translated_request_cmdbuf = std::move(translated_cmdbuf);
+
+    if (server_thread) {
+        record.server_process = GetObjectInfo(server_thread->owner_process);
+        record.server_thread = GetObjectInfo(server_thread.get());
+    } else {
+        record.is_hle = true;
+    }
+
+    // Function name
+    ASSERT_MSG(client_session_map.count(thread_id), "Client session is missing");
+    const auto& client_session = client_session_map[thread_id];
+    if (client_session->parent->port &&
+        client_session->parent->port->GetServerPort()->hle_handler) {
+
+        record.function_name = std::dynamic_pointer_cast<Service::ServiceFrameworkBase>(
+                                   client_session->parent->port->GetServerPort()->hle_handler)
+                                   ->GetFunctionName(record.untranslated_request_cmdbuf[0]);
+    }
+    client_session_map.erase(thread_id);
+
+    InvokeCallbacks(record);
+}
+
+void Recorder::SetReplyInfo(const std::shared_ptr<Kernel::Thread>& client_thread,
+                            std::vector<u32> untranslated_cmdbuf,
+                            std::vector<u32> translated_cmdbuf) {
+    const u32 thread_id = client_thread->GetThreadId();
+    if (!record_map.count(thread_id)) {
+        // This is possible when the recorder is enabled after application started
+        LOG_ERROR(Kernel, "No request is assoicated with the thread");
+        return;
+    }
+
+    auto& record = *record_map[thread_id];
+    if (record.status != RequestStatus::HLEUnimplemented) {
+        record.status = RequestStatus::Handled;
+    }
+
+    record.untranslated_reply_cmdbuf = std::move(untranslated_cmdbuf);
+    record.translated_reply_cmdbuf = std::move(translated_cmdbuf);
+    InvokeCallbacks(record);
+
+    record_map.erase(thread_id);
+}
+
+void Recorder::SetHLEUnimplemented(const std::shared_ptr<Kernel::Thread>& client_thread) {
+    const u32 thread_id = client_thread->GetThreadId();
+    if (!record_map.count(thread_id)) {
+        // This is possible when the recorder is enabled after application started
+        LOG_ERROR(Kernel, "No request is assoicated with the thread");
+        return;
+    }
+
+    auto& record = *record_map[thread_id];
+    record.status = RequestStatus::HLEUnimplemented;
+}
+
+CallbackHandle Recorder::BindCallback(CallbackType callback) {
+    std::unique_lock lock(callback_mutex);
+    CallbackHandle handle = std::make_shared<CallbackType>(callback);
+    callbacks.emplace(handle);
+    return handle;
+}
+
+void Recorder::UnbindCallback(const CallbackHandle& handle) {
+    std::unique_lock lock(callback_mutex);
+    callbacks.erase(handle);
+}
+
+void Recorder::InvokeCallbacks(const RequestRecord& request) {
+    {
+        std::shared_lock lock(callback_mutex);
+        for (const auto& iter : callbacks) {
+            (*iter)(request);
+        }
+    }
+}
+
+void Recorder::SetEnabled(bool enabled_) {
+    enabled.store(enabled_, std::memory_order_relaxed);
+}
+
+} // namespace IPCDebugger

src/core/hle/kernel/ipc_debugger/recorder.h

@@ -0,0 +1,129 @@
+// Copyright 2019 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <atomic>
+#include <functional>
+#include <memory>
+#include <set>
+#include <shared_mutex>
+#include <string>
+#include <unordered_map>
+#include <vector>
+#include "common/common_types.h"
+
+namespace Kernel {
+class ClientSession;
+class Thread;
+} // namespace Kernel
+
+namespace IPCDebugger {
+
+/**
+ * Record of a kernel object, for debugging purposes.
+ */
+struct ObjectInfo {
+    std::string type;
+    std::string name;
+    int id = -1;
+};
+
+/**
+ * Status of a request.
+ */
+enum class RequestStatus {
+    Invalid,          ///< Invalid status
+    Sent,             ///< The request is sent to the kernel and is waiting to be handled
+    Handling,         ///< The request is being handled
+    Handled,          ///< The request is handled with reply sent
+    HLEUnimplemented, ///< The request is unimplemented by HLE, and unhandled
+};
+
+/**
+ * Record of an IPC request.
+ */
+struct RequestRecord {
+    int id;
+    RequestStatus status = RequestStatus::Invalid;
+    ObjectInfo client_process;
+    ObjectInfo client_thread;
+    ObjectInfo client_session;
+    ObjectInfo client_port;    // Not available for portless
+    ObjectInfo server_process; // Only available for LLE requests
+    ObjectInfo server_thread;  // Only available for LLE requests
+    ObjectInfo server_session;
+    std::string function_name; // Not available for LLE or portless
+    bool is_hle = false;
+    // Request info is only available when status is not `Invalid` or `Sent`
+    std::vector<u32> untranslated_request_cmdbuf;
+    std::vector<u32> translated_request_cmdbuf;
+    // Reply info is only available when status is `Handled`
+    std::vector<u32> untranslated_reply_cmdbuf;
+    std::vector<u32> translated_reply_cmdbuf;
+};
+
+using CallbackType = std::function<void(const RequestRecord&)>;
+using CallbackHandle = std::shared_ptr<CallbackType>;
+
+class Recorder {
+public:
+    explicit Recorder();
+    ~Recorder();
+
+    /**
+     * Returns whether the recorder is enabled.
+     */
+    bool IsEnabled() const;
+
+    /**
+     * Registers a request into the recorder. The request is then assoicated with the client thread.
+     */
+    void RegisterRequest(const std::shared_ptr<Kernel::ClientSession>& client_session,
+                         const std::shared_ptr<Kernel::Thread>& client_thread);
+
+    /**
+     * Sets the request information of the request record associated with the client thread.
+     * When the server thread is empty, the request will be considered HLE.
+     */
+    void SetRequestInfo(const std::shared_ptr<Kernel::Thread>& client_thread,
+                        std::vector<u32> untranslated_cmdbuf, std::vector<u32> translated_cmdbuf,
+                        const std::shared_ptr<Kernel::Thread>& server_thread = {});
+
+    /**
+     * Sets the reply information of the request record assoicated with the client thread.
+     * The request is then unlinked from the client thread.
+     */
+    void SetReplyInfo(const std::shared_ptr<Kernel::Thread>& client_thread,
+                      std::vector<u32> untranslated_cmdbuf, std::vector<u32> translated_cmdbuf);
+
+    /**
+     * Set the status of a record to HLEUnimplemented.
+     */
+    void SetHLEUnimplemented(const std::shared_ptr<Kernel::Thread>& client_thread);
+
+    /**
+     * Set the status of the debugger (enabled/disabled).
+     */
+    void SetEnabled(bool enabled);
+
+    CallbackHandle BindCallback(CallbackType callback);
+    void UnbindCallback(const CallbackHandle& handle);
+
+private:
+    void InvokeCallbacks(const RequestRecord& request);
+
+    std::unordered_map<u32, std::unique_ptr<RequestRecord>> record_map;
+    int record_count{};
+
+    // Temporary client session map for function name handling
+    std::unordered_map<u32, std::shared_ptr<Kernel::ClientSession>> client_session_map;
+
+    std::atomic_bool enabled{false};
+
+    std::set<CallbackHandle> callbacks;
+    mutable std::shared_mutex callback_mutex;
+};
+
+} // namespace IPCDebugger

src/core/hle/kernel/kernel.cpp

@@ -5,6 +5,7 @@
 #include "core/hle/kernel/client_port.h"
 #include "core/hle/kernel/config_mem.h"
 #include "core/hle/kernel/handle_table.h"
+#include "core/hle/kernel/ipc_debugger/recorder.h"
 #include "core/hle/kernel/kernel.h"
 #include "core/hle/kernel/memory.h"
 #include "core/hle/kernel/process.h"
@@ -25,6 +26,7 @@ KernelSystem::KernelSystem(Memory::MemorySystem& memory, Core::Timing& timing,
     resource_limits = std::make_unique<ResourceLimitList>(*this);
     thread_manager = std::make_unique<ThreadManager>(*this);
     timer_manager = std::make_unique<TimerManager>(timing);
+    ipc_recorder = std::make_unique<IPCDebugger::Recorder>();
 }
 
 /// Shutdown the kernel
@@ -87,6 +89,14 @@ const SharedPage::Handler& KernelSystem::GetSharedPageHandler() const {
     return *shared_page_handler;
 }
 
+IPCDebugger::Recorder& KernelSystem::GetIPCRecorder() {
+    return *ipc_recorder;
+}
+
+const IPCDebugger::Recorder& KernelSystem::GetIPCRecorder() const {
+    return *ipc_recorder;
+}
+
 void KernelSystem::AddNamedPort(std::string name, std::shared_ptr<ClientPort> port) {
     named_ports.emplace(std::move(name), std::move(port));
 }

src/core/hle/kernel/kernel.h

@@ -32,6 +32,10 @@ namespace Core {
 class Timing;
 }
 
+namespace IPCDebugger {
+class Recorder;
+}
+
 namespace Kernel {
 
 class AddressArbiter;
@@ -222,6 +226,9 @@ public:
     SharedPage::Handler& GetSharedPageHandler();
     const SharedPage::Handler& GetSharedPageHandler() const;
 
+    IPCDebugger::Recorder& GetIPCRecorder();
+    const IPCDebugger::Recorder& GetIPCRecorder() const;
+
     MemoryRegionInfo* GetMemoryRegion(MemoryRegion region);
 
     void HandleSpecialMapping(VMManager& address_space, const AddressMapping& mapping);
@@ -274,6 +281,8 @@ private:
 
     std::unique_ptr<ConfigMem::Handler> config_mem_handler;
     std::unique_ptr<SharedPage::Handler> shared_page_handler;
+
+    std::unique_ptr<IPCDebugger::Recorder> ipc_recorder;
 };
 
 } // namespace Kernel

src/core/hle/kernel/svc.cpp

@@ -19,6 +19,7 @@
 #include "core/hle/kernel/event.h"
 #include "core/hle/kernel/handle_table.h"
 #include "core/hle/kernel/ipc.h"
+#include "core/hle/kernel/ipc_debugger/recorder.h"
 #include "core/hle/kernel/memory.h"
 #include "core/hle/kernel/mutex.h"
 #include "core/hle/kernel/process.h"
@@ -387,7 +388,13 @@ ResultCode SVC::SendSyncRequest(Handle handle) {
 
     system.PrepareReschedule();
 
-    return session->SendSyncRequest(SharedFrom(kernel.GetThreadManager().GetCurrentThread()));
+    auto thread = SharedFrom(kernel.GetThreadManager().GetCurrentThread());
+
+    if (kernel.GetIPCRecorder().IsEnabled()) {
+        kernel.GetIPCRecorder().RegisterRequest(session, thread);
+    }
+
+    return session->SendSyncRequest(thread);
 }
 
 /// Close a handle
@@ -593,7 +600,7 @@ ResultCode SVC::WaitSynchronizationN(s32* out, VAddr handles_address, s32 handle
     }
 }
 
-static ResultCode ReceiveIPCRequest(Memory::MemorySystem& memory,
+static ResultCode ReceiveIPCRequest(Kernel::KernelSystem& kernel, Memory::MemorySystem& memory,
                                     std::shared_ptr<ServerSession> server_session,
                                     std::shared_ptr<Thread> thread) {
     if (server_session->parent->client == nullptr) {
@@ -603,9 +610,9 @@ static ResultCode ReceiveIPCRequest(Memory::MemorySystem& memory,
     VAddr target_address = thread->GetCommandBufferAddress();
     VAddr source_address = server_session->currently_handling->GetCommandBufferAddress();
 
-    ResultCode translation_result =
-        TranslateCommandBuffer(memory, server_session->currently_handling, thread, source_address,
-                               target_address, server_session->mapped_buffer_context, false);
+    ResultCode translation_result = TranslateCommandBuffer(
+        kernel, memory, server_session->currently_handling, thread, source_address, target_address,
+        server_session->mapped_buffer_context, false);
 
     // If a translation error occurred, immediately resume the client thread.
     if (translation_result.IsError()) {
@@ -670,9 +677,9 @@ ResultCode SVC::ReplyAndReceive(s32* index, VAddr handles_address, s32 handle_co
         VAddr source_address = thread->GetCommandBufferAddress();
         VAddr target_address = request_thread->GetCommandBufferAddress();
 
-        ResultCode translation_result =
-            TranslateCommandBuffer(memory, SharedFrom(thread), request_thread, source_address,
-                                   target_address, session->mapped_buffer_context, true);
+        ResultCode translation_result = TranslateCommandBuffer(
+            kernel, memory, SharedFrom(thread), request_thread, source_address, target_address,
+            session->mapped_buffer_context, true);
 
         // Note: The real kernel seems to always panic if the Server->Client buffer translation
         // fails for whatever reason.
@@ -707,7 +714,7 @@ ResultCode SVC::ReplyAndReceive(s32* index, VAddr handles_address, s32 handle_co
             return RESULT_SUCCESS;
 
         auto server_session = static_cast<ServerSession*>(object);
-        return ReceiveIPCRequest(memory, SharedFrom(server_session), SharedFrom(thread));
+        return ReceiveIPCRequest(kernel, memory, SharedFrom(server_session), SharedFrom(thread));
     }
 
     // No objects were ready to be acquired, prepare to suspend the thread.
@@ -723,9 +730,9 @@ ResultCode SVC::ReplyAndReceive(s32* index, VAddr handles_address, s32 handle_co
 
     thread->wait_objects = std::move(objects);
 
-    thread->wakeup_callback = [& memory = this->memory](ThreadWakeupReason reason,
-                                                        std::shared_ptr<Thread> thread,
-                                                        std::shared_ptr<WaitObject> object) {
+    thread->wakeup_callback = [& kernel = this->kernel, &memory = this->memory](
+                                  ThreadWakeupReason reason, std::shared_ptr<Thread> thread,
+                                  std::shared_ptr<WaitObject> object) {
         ASSERT(thread->status == ThreadStatus::WaitSynchAny);
         ASSERT(reason == ThreadWakeupReason::Signal);
 
@@ -733,7 +740,7 @@ ResultCode SVC::ReplyAndReceive(s32* index, VAddr handles_address, s32 handle_co
 
         if (object->GetHandleType() == HandleType::ServerSession) {
             auto server_session = DynamicObjectCast<ServerSession>(object);
-            result = ReceiveIPCRequest(memory, server_session, thread);
+            result = ReceiveIPCRequest(kernel, memory, server_session, thread);
         }
 
         thread->SetWaitSynchronizationResult(result);

src/core/hle/service/service.cpp

@@ -171,6 +171,7 @@ void ServiceFrameworkBase::HandleSyncRequest(Kernel::HLERequestContext& context)
     auto itr = handlers.find(header_code);
     const FunctionInfoBase* info = itr == handlers.end() ? nullptr : &itr->second;
     if (info == nullptr || info->handler_callback == nullptr) {
+        context.ReportUnimplemented();
         return ReportUnimplementedFunction(context.CommandBuffer(), info);
     }
 
@@ -179,6 +180,14 @@ void ServiceFrameworkBase::HandleSyncRequest(Kernel::HLERequestContext& context)
     handler_invoker(this, info->handler_callback, context);
 }
 
+std::string ServiceFrameworkBase::GetFunctionName(u32 header) const {
+    if (!handlers.count(header)) {
+        return "";
+    }
+
+    return handlers.at(header).name;
+}
+
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // Module interface
 

src/core/hle/service/service.h

@@ -64,6 +64,9 @@ public:
 
     void HandleSyncRequest(Kernel::HLERequestContext& context) override;
 
+    /// Retrieves name of a function based on the header code. For IPC Recorder.
+    std::string GetFunctionName(u32 header) const;
+
 protected:
     /// Member-function pointer type of SyncRequest handlers.
     template <typename Self>

src/core/hle/service/sm/sm.cpp

@@ -42,6 +42,7 @@ ResultVal<std::shared_ptr<Kernel::ServerPort>> ServiceManager::RegisterService(
 
     auto [server_port, client_port] = system.Kernel().CreatePortPair(max_sessions, name);
 
+    registered_services_inverse.emplace(client_port->GetObjectId(), name);
     registered_services.emplace(std::move(name), std::move(client_port));
     return MakeResult(std::move(server_port));
 }
@@ -65,4 +66,12 @@ ResultVal<std::shared_ptr<Kernel::ClientSession>> ServiceManager::ConnectToServi
     return client_port->Connect();
 }
 
+std::string ServiceManager::GetServiceNameByPortId(u32 port) const {
+    if (registered_services_inverse.count(port)) {
+        return registered_services_inverse.at(port);
+    }
+
+    return "";
+}
+
 } // namespace Service::SM

src/core/hle/service/sm/sm.h

@@ -51,6 +51,8 @@ public:
                                                                    unsigned int max_sessions);
     ResultVal<std::shared_ptr<Kernel::ClientPort>> GetServicePort(const std::string& name);
     ResultVal<std::shared_ptr<Kernel::ClientSession>> ConnectToService(const std::string& name);
+    // For IPC Recorder
+    std::string GetServiceNameByPortId(u32 port) const;
 
     template <typename T>
     std::shared_ptr<T> GetService(const std::string& service_name) const {
@@ -74,6 +76,10 @@ private:
 
     /// Map of registered services, retrieved using GetServicePort or ConnectToService.
     std::unordered_map<std::string, std::shared_ptr<Kernel::ClientPort>> registered_services;
+
+    // For IPC Recorder
+    /// client port Object id -> service name
+    std::unordered_map<u32, std::string> registered_services_inverse;
 };
 
 } // namespace Service::SM