2 files changed, 233 insertions, 0 deletions

diff --git a/src/core/hle/service/lm/manager.cpp b/src/core/hle/service/lm/manager.cpp
new file mode 100644
index 000000000..fd8edaf46
--- /dev/null
+++ b/src/core/hle/service/lm/manager.cpp
@@ -0,0 +1,129 @@
+// Copyright 2019 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/assert.h"
+#include "common/logging/log.h"
+#include "common/string_util.h"
+#include "core/hle/service/lm/manager.h"
+#include "core/reporter.h"
+
+namespace Service::LM {
+
+std::ostream& operator<<(std::ostream& os, DestinationFlag dest) {
+    std::vector<std::string> array;
+    const auto check_single_flag = [dest, &array](DestinationFlag check, std::string name) {
+        if ((static_cast<u32>(check) & static_cast<u32>(dest)) > 0) {
+            array.emplace_back(std::move(name));
+        }
+    };
+
+    check_single_flag(DestinationFlag::Default, "Default");
+    check_single_flag(DestinationFlag::UART, "UART");
+    check_single_flag(DestinationFlag::UARTSleeping, "UART (Sleeping)");
+
+    os << "[";
+    for (const auto& entry : array) {
+        os << entry << ", ";
+    }
+    return os << "]";
+}
+
+std::ostream& operator<<(std::ostream& os, MessageHeader::Severity severity) {
+    switch (severity) {
+    case MessageHeader::Severity::Trace:
+        return os << "Trace";
+    case MessageHeader::Severity::Info:
+        return os << "Info";
+    case MessageHeader::Severity::Warning:
+        return os << "Warning";
+    case MessageHeader::Severity::Error:
+        return os << "Error";
+    case MessageHeader::Severity::Critical:
+        return os << "Critical";
+    default:
+        return os << fmt::format("{:08X}", static_cast<u32>(severity));
+    }
+}
+
+std::ostream& operator<<(std::ostream& os, Field field) {
+    switch (field) {
+    case Field::Skip:
+        return os << "Skip";
+    case Field::Message:
+        return os << "Message";
+    case Field::Line:
+        return os << "Line";
+    case Field::Filename:
+        return os << "Filename";
+    case Field::Function:
+        return os << "Function";
+    case Field::Module:
+        return os << "Module";
+    case Field::Thread:
+        return os << "Thread";
+    default:
+        return os << fmt::format("{:08X}", static_cast<u32>(field));
+    }
+}
+
+std::string FormatField(Field type, const std::vector<u8>& data) {
+    switch (type) {
+    case Field::Skip:
+        return "";
+    case Field::Line:
+        if (data.size() >= sizeof(u32)) {
+            u32 line;
+            std::memcpy(&line, data.data(), sizeof(u32));
+            return fmt::format("{:08X}", line);
+        }
+        return "[ERROR DECODING LINE NUMBER]";
+    case Field::Message:
+    case Field::Filename:
+    case Field::Function:
+    case Field::Module:
+    case Field::Thread:
+        return Common::StringFromFixedZeroTerminatedBuffer(
+            reinterpret_cast<const char*>(data.data()), data.size());
+    default:
+        UNIMPLEMENTED();
+    }
+}
+
+Manager::Manager(Core::Reporter& reporter) : reporter(reporter) {}
+
+Manager::~Manager() = default;
+
+void Manager::SetEnabled(bool enabled) {
+    this->enabled = enabled;
+}
+
+void Manager::SetDestination(DestinationFlag destination) {
+    this->destination = destination;
+}
+
+void Manager::Log(LogMessage message) {
+    if (message.header.IsHeadLog()) {
+        InitializeLog();
+    }
+
+    current_log.emplace_back(std::move(message));
+
+    if (current_log.back().header.IsTailLog()) {
+        FinalizeLog();
+    }
+}
+
+void Manager::InitializeLog() {
+    current_log.clear();
+
+    LOG_INFO(Service_LM, "Initialized new log session!");
+}
+
+void Manager::FinalizeLog() {
+    reporter.SaveLogReport(static_cast<u32>(destination), std::move(current_log));
+
+    LOG_INFO(Service_LM, "Finalized current log session!");
+}
+
+} // namespace Service::LM
diff --git a/src/core/hle/service/lm/manager.h b/src/core/hle/service/lm/manager.h
new file mode 100644
index 000000000..af0a27257
--- /dev/null
+++ b/src/core/hle/service/lm/manager.h
@@ -0,0 +1,104 @@
+// Copyright 2019 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <map>
+#include <ostream>
+#include <vector>
+#include "common/bit_field.h"
+#include "common/common_types.h"
+#include "common/swap.h"
+
+namespace Core {
+class Reporter;
+}
+
+namespace Service::LM {
+
+enum class DestinationFlag : u32 {
+    Default = 1,
+    UART = 2,
+    UARTSleeping = 4,
+
+    All = 0xFFFF,
+};
+
+struct MessageHeader {
+    enum Flags : u32_le {
+        IsHead = 1,
+        IsTail = 2,
+    };
+    enum Severity : u32_le {
+        Trace,
+        Info,
+        Warning,
+        Error,
+        Critical,
+    };
+
+    u64_le pid;
+    u64_le thread_context;
+    union {
+        BitField<0, 16, Flags> flags;
+        BitField<16, 8, Severity> severity;
+        BitField<24, 8, u32> verbosity;
+    };
+    u32_le payload_size;
+
+    bool IsHeadLog() const {
+        return flags & IsHead;
+    }
+    bool IsTailLog() const {
+        return flags & IsTail;
+    }
+};
+static_assert(sizeof(MessageHeader) == 0x18, "MessageHeader is incorrect size");
+
+enum class Field : u8 {
+    Skip = 1,
+    Message = 2,
+    Line = 3,
+    Filename = 4,
+    Function = 5,
+    Module = 6,
+    Thread = 7,
+};
+
+std::ostream& operator<<(std::ostream& os, DestinationFlag dest);
+std::ostream& operator<<(std::ostream& os, MessageHeader::Severity severity);
+std::ostream& operator<<(std::ostream& os, Field field);
+
+using FieldMap = std::map<Field, std::vector<u8>>;
+
+struct LogMessage {
+    MessageHeader header;
+    FieldMap fields;
+};
+
+std::string FormatField(Field type, const std::vector<u8>& data);
+
+class Manager {
+public:
+    Manager(Core::Reporter& reporter);
+    ~Manager();
+
+    void SetEnabled(bool enabled);
+    void SetDestination(DestinationFlag destination);
+
+    void Log(LogMessage message);
+
+private:
+    void InitializeLog();
+    void FinalizeLog();
+
+    bool enabled = true;
+    DestinationFlag destination = DestinationFlag::All;
+
+    std::vector<LogMessage> current_log;
+
+    Core::Reporter& reporter;
+};
+
+} // namespace Service::LM