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// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <string>
#include "common/logging/log.h"
#include "core/hle/ipc_helpers.h"
#include "core/hle/kernel/client_session.h"
#include "core/hle/service/lm/lm.h"
namespace Service {
namespace LM {
class Logger final : public ServiceFramework<Logger> {
public:
Logger() : ServiceFramework("Logger") {
static const FunctionInfo functions[] = {
{0x00000000, &Logger::Log, "Log"},
};
RegisterHandlers(functions);
}
~Logger() = default;
private:
struct MessageHeader {
enum Flags : u32_le {
IsHead = 1,
IsTail = 2,
};
u64_le pid;
u64_le threadContext;
union {
BitField<0, 16, Flags> flags;
BitField<16, 8, u32_le> severity;
BitField<24, 8, u32_le> verbosity;
};
u32_le payload_size;
/// Returns true if this is part of a single log message
bool IsSingleMessage() const {
return (flags & Flags::IsHead) && (flags & Flags::IsTail);
}
};
static_assert(sizeof(MessageHeader) == 0x18, "MessageHeader is incorrect size");
/// Log field type
enum class Field : u8 {
Message = 2,
Line = 3,
Filename = 4,
Function = 5,
Module = 6,
Thread = 7,
};
/**
* LM::Initialize service function
* Inputs:
* 0: 0x00000000
* Outputs:
* 0: ResultCode
*/
void Log(Kernel::HLERequestContext& ctx) {
// This function only succeeds - Get that out of the way
IPC::RequestBuilder rb{ctx, 1};
rb.Push(RESULT_SUCCESS);
// Read MessageHeader, despite not doing anything with it right now
MessageHeader header{};
VAddr addr{ctx.BufferDescriptorX()[0].Address()};
const VAddr end_addr{addr + ctx.BufferDescriptorX()[0].size};
Memory::ReadBlock(addr, &header, sizeof(MessageHeader));
addr += sizeof(MessageHeader);
if (!header.IsSingleMessage()) {
LOG_WARNING(Service, "Multi message logs are unimplemeneted");
return;
}
// Parse out log metadata
u32 line{};
std::string message, filename, function;
while (addr < end_addr) {
const Field field{static_cast<Field>(Memory::Read8(addr++))};
size_t length{Memory::Read8(addr++)};
switch (field) {
case Field::Message:
message = Memory::ReadCString(addr, length);
break;
case Field::Line:
line = Memory::Read32(addr);
break;
case Field::Filename:
filename = Memory::ReadCString(addr, length);
break;
case Field::Function:
function = Memory::ReadCString(addr, length);
break;
}
addr += length;
}
// Empty log - nothing to do here
if (message.empty()) {
return;
}
// Format a nicely printable string out of the log metadata
std::string output;
if (filename.size()) {
output += filename + ':';
}
if (function.size()) {
output += function + ':';
}
if (line) {
output += std::to_string(line) + ':';
}
if (output.back() == ':') {
output += ' ';
}
output += message;
LOG_DEBUG(Debug_Emulated, "%s", output.c_str());
}
};
void InstallInterfaces(SM::ServiceManager& service_manager) {
std::make_shared<LM>()->InstallAsService(service_manager);
}
/**
* LM::Initialize service function
* Inputs:
* 0: 0x00000000
* Outputs:
* 0: ResultCode
*/
void LM::Initialize(Kernel::HLERequestContext& ctx) {
auto client_port = std::make_shared<Logger>()->CreatePort();
auto session = client_port->Connect();
if (session.Succeeded()) {
LOG_DEBUG(Service_SM, "called, initialized logger -> session=%u",
(*session)->GetObjectId());
IPC::RequestBuilder rb{ctx, 1, 0, 1};
rb.Push(RESULT_SUCCESS);
rb.PushMoveObjects(std::move(session).Unwrap());
registered_loggers.emplace_back(std::move(client_port));
} else {
UNIMPLEMENTED();
}
LOG_INFO(Service_SM, "called");
}
LM::LM() : ServiceFramework("lm") {
static const FunctionInfo functions[] = {
{0x00000000, &LM::Initialize, "Initialize"},
};
RegisterHandlers(functions);
}
} // namespace LM
} // namespace Service
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