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Merge pull request #9225 from liamwhite/debugger-instance

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Debugger improvements
This commit is contained in:
liamwhite 2022-11-12 21:04:00 -05:00 committed by GitHub
commit 040a01a5dd
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 254 additions and 74 deletions
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151
src/core/debugger/debugger.cpp
View file

@ -27,9 +27,18 @@ static void AsyncReceiveInto(Readable& r, Buffer& buffer, Callback&& c) {
const u8* buffer_start = reinterpret_cast<const u8*>(&buffer);
std::span<const u8> received_data{buffer_start, buffer_start + bytes_read};
c(received_data);
}
AsyncReceiveInto(r, buffer, c);
}
});
}
template <typename Callback>
static void AsyncAccept(boost::asio::ip::tcp::acceptor& acceptor, Callback&& c) {
acceptor.async_accept([&, c](const boost::system::error_code& error, auto&& peer_socket) {
if (!error.failed()) {
c(peer_socket);
AsyncAccept(acceptor, c);
}
});
}
@ -59,9 +68,7 @@ namespace Core {
class DebuggerImpl : public DebuggerBackend {
public:
explicit DebuggerImpl(Core::System& system_, u16 port)
: system{system_}, signal_pipe{io_context}, client_socket{io_context} {
frontend = std::make_unique<GDBStub>(*this, system);
explicit DebuggerImpl(Core::System& system_, u16 port) : system{system_} {
InitializeServer(port);
}
@ -70,10 +77,9 @@ public:
}
bool SignalDebugger(SignalInfo signal_info) {
{
std::scoped_lock lk{connection_lock};
if (stopped) {
if (stopped || !state) {
// Do not notify the debugger about another event.
// It should be ignored.
return false;
@ -81,28 +87,32 @@ public:
// Set up the state.
stopped = true;
info = signal_info;
}
state->info = signal_info;
// Write a single byte into the pipe to wake up the debug interface.
boost::asio::write(signal_pipe, boost::asio::buffer(&stopped, sizeof(stopped)));
boost::asio::write(state->signal_pipe, boost::asio::buffer(&stopped, sizeof(stopped)));
return true;
}
// These functions are callbacks from the frontend, and the lock will be held.
// There is no need to relock it.
std::span<const u8> ReadFromClient() override {
return ReceiveInto(client_socket, client_data);
return ReceiveInto(state->client_socket, state->client_data);
}
void WriteToClient(std::span<const u8> data) override {
boost::asio::write(client_socket, boost::asio::buffer(data.data(), data.size_bytes()));
boost::asio::write(state->client_socket,
boost::asio::buffer(data.data(), data.size_bytes()));
}
void SetActiveThread(Kernel::KThread* thread) override {
active_thread = thread;
state->active_thread = thread;
}
Kernel::KThread* GetActiveThread() override {
return active_thread;
return state->active_thread;
}
private:
@ -113,65 +123,78 @@ private:
// Run the connection thread.
connection_thread = std::jthread([&, port](std::stop_token stop_token) {
Common::SetCurrentThreadName("Debugger");
try {
// Initialize the listening socket and accept a new client.
tcp::endpoint endpoint{boost::asio::ip::address_v4::any(), port};
tcp::acceptor acceptor{io_context, endpoint};
acceptor.async_accept(client_socket, [](const auto&) {});
io_context.run_one();
io_context.restart();
AsyncAccept(acceptor, [&](auto&& peer) { AcceptConnection(std::move(peer)); });
if (stop_token.stop_requested()) {
return;
while (!stop_token.stop_requested() && io_context.run()) {
}
ThreadLoop(stop_token);
} catch (const std::exception& ex) {
LOG_CRITICAL(Debug_GDBStub, "Stopping server: {}", ex.what());
}
});
}
void AcceptConnection(boost::asio::ip::tcp::socket&& peer) {
LOG_INFO(Debug_GDBStub, "Accepting new peer connection");
std::scoped_lock lk{connection_lock};
// Ensure everything is stopped.
PauseEmulation();
// Set up the new frontend.
frontend = std::make_unique<GDBStub>(*this, system);
// Set the new state. This will tear down any existing state.
state = ConnectionState{
.client_socket{std::move(peer)},
.signal_pipe{io_context},
.info{},
.active_thread{},
.client_data{},
.pipe_data{},
};
// Set up the client signals for new data.
AsyncReceiveInto(state->signal_pipe, state->pipe_data, [&](auto d) { PipeData(d); });
AsyncReceiveInto(state->client_socket, state->client_data, [&](auto d) { ClientData(d); });
// Set the active thread.
UpdateActiveThread();
// Set up the frontend.
frontend->Connected();
}
void ShutdownServer() {
connection_thread.request_stop();
io_context.stop();
connection_thread.join();
}
void ThreadLoop(std::stop_token stop_token) {
Common::SetCurrentThreadName("Debugger");
// Set up the client signals for new data.
AsyncReceiveInto(signal_pipe, pipe_data, [&](auto d) { PipeData(d); });
AsyncReceiveInto(client_socket, client_data, [&](auto d) { ClientData(d); });
// Set the active thread.
UpdateActiveThread();
// Set up the frontend.
frontend->Connected();
// Main event loop.
while (!stop_token.stop_requested() && io_context.run()) {
}
}
void PipeData(std::span<const u8> data) {
switch (info.type) {
std::scoped_lock lk{connection_lock};
switch (state->info.type) {
case SignalType::Stopped:
case SignalType::Watchpoint:
// Stop emulation.
PauseEmulation();
// Notify the client.
active_thread = info.thread;
state->active_thread = state->info.thread;
UpdateActiveThread();
if (info.type == SignalType::Watchpoint) {
frontend->Watchpoint(active_thread, *info.watchpoint);
if (state->info.type == SignalType::Watchpoint) {
frontend->Watchpoint(state->active_thread, *state->info.watchpoint);
} else {
frontend->Stopped(active_thread);
frontend->Stopped(state->active_thread);
}
break;
@ -179,8 +202,8 @@ private:
frontend->ShuttingDown();
// Wait for emulation to shut down gracefully now.
signal_pipe.close();
client_socket.shutdown(boost::asio::socket_base::shutdown_both);
state->signal_pipe.close();
state->client_socket.shutdown(boost::asio::socket_base::shutdown_both);
LOG_INFO(Debug_GDBStub, "Shut down server");
break;
@ -188,17 +211,16 @@ private:
}
void ClientData(std::span<const u8> data) {
std::scoped_lock lk{connection_lock};
const auto actions{frontend->ClientData(data)};
for (const auto action : actions) {
switch (action) {
case DebuggerAction::Interrupt: {
{
std::scoped_lock lk{connection_lock};
stopped = true;
}
PauseEmulation();
UpdateActiveThread();
frontend->Stopped(active_thread);
frontend->Stopped(state->active_thread);
break;
}
case DebuggerAction::Continue:
@ -206,15 +228,15 @@ private:
break;
case DebuggerAction::StepThreadUnlocked:
MarkResumed([&] {
active_thread->SetStepState(Kernel::StepState::StepPending);
active_thread->Resume(Kernel::SuspendType::Debug);
ResumeEmulation(active_thread);
state->active_thread->SetStepState(Kernel::StepState::StepPending);
state->active_thread->Resume(Kernel::SuspendType::Debug);
ResumeEmulation(state->active_thread);
});
break;
case DebuggerAction::StepThreadLocked: {
MarkResumed([&] {
active_thread->SetStepState(Kernel::StepState::StepPending);
active_thread->Resume(Kernel::SuspendType::Debug);
state->active_thread->SetStepState(Kernel::StepState::StepPending);
state->active_thread->Resume(Kernel::SuspendType::Debug);
});
break;
}
@ -254,15 +276,14 @@ private:
template <typename Callback>
void MarkResumed(Callback&& cb) {
Kernel::KScopedSchedulerLock sl{system.Kernel()};
std::scoped_lock cl{connection_lock};
stopped = false;
cb();
}
void UpdateActiveThread() {
const auto& threads{ThreadList()};
if (std::find(threads.begin(), threads.end(), active_thread) == threads.end()) {
active_thread = threads[0];
if (std::find(threads.begin(), threads.end(), state->active_thread) == threads.end()) {
state->active_thread = threads[0];
}
}
@ -274,18 +295,22 @@ private:
System& system;
std::unique_ptr<DebuggerFrontend> frontend;
boost::asio::io_context io_context;
std::jthread connection_thread;
std::mutex connection_lock;
boost::asio::io_context io_context;
boost::process::async_pipe signal_pipe;
struct ConnectionState {
boost::asio::ip::tcp::socket client_socket;
boost::process::async_pipe signal_pipe;
SignalInfo info;
Kernel::KThread* active_thread;
bool pipe_data;
bool stopped;
std::array<u8, 4096> client_data;
bool pipe_data;
};
std::optional<ConnectionState> state{};
bool stopped{};
};
Debugger::Debugger(Core::System& system, u16 port) {

151
src/core/debugger/gdbstub.cpp
View file

@ -606,6 +606,8 @@ void GDBStub::HandleQuery(std::string_view command) {
} else if (command.starts_with("StartNoAckMode")) {
no_ack = true;
SendReply(GDB_STUB_REPLY_OK);
} else if (command.starts_with("Rcmd,")) {
HandleRcmd(Common::HexStringToVector(command.substr(5), false));
} else {
SendReply(GDB_STUB_REPLY_EMPTY);
}
@ -645,6 +647,155 @@ void GDBStub::HandleVCont(std::string_view command, std::vector<DebuggerAction>&
}
}
constexpr std::array<std::pair<const char*, Kernel::Svc::MemoryState>, 22> MemoryStateNames{{
{"----- Free -----", Kernel::Svc::MemoryState::Free},
{"Io ", Kernel::Svc::MemoryState::Io},
{"Static ", Kernel::Svc::MemoryState::Static},
{"Code ", Kernel::Svc::MemoryState::Code},
{"CodeData ", Kernel::Svc::MemoryState::CodeData},
{"Normal ", Kernel::Svc::MemoryState::Normal},
{"Shared ", Kernel::Svc::MemoryState::Shared},
{"AliasCode ", Kernel::Svc::MemoryState::AliasCode},
{"AliasCodeData ", Kernel::Svc::MemoryState::AliasCodeData},
{"Ipc ", Kernel::Svc::MemoryState::Ipc},
{"Stack ", Kernel::Svc::MemoryState::Stack},
{"ThreadLocal ", Kernel::Svc::MemoryState::ThreadLocal},
{"Transfered ", Kernel::Svc::MemoryState::Transfered},
{"SharedTransfered", Kernel::Svc::MemoryState::SharedTransfered},
{"SharedCode ", Kernel::Svc::MemoryState::SharedCode},
{"Inaccessible ", Kernel::Svc::MemoryState::Inaccessible},
{"NonSecureIpc ", Kernel::Svc::MemoryState::NonSecureIpc},
{"NonDeviceIpc ", Kernel::Svc::MemoryState::NonDeviceIpc},
{"Kernel ", Kernel::Svc::MemoryState::Kernel},
{"GeneratedCode ", Kernel::Svc::MemoryState::GeneratedCode},
{"CodeOut ", Kernel::Svc::MemoryState::CodeOut},
{"Coverage ", Kernel::Svc::MemoryState::Coverage},
}};
static constexpr const char* GetMemoryStateName(Kernel::Svc::MemoryState state) {
for (size_t i = 0; i < MemoryStateNames.size(); i++) {
if (std::get<1>(MemoryStateNames[i]) == state) {
return std::get<0>(MemoryStateNames[i]);
}
}
return "Unknown ";
}
static constexpr const char* GetMemoryPermissionString(const Kernel::Svc::MemoryInfo& info) {
if (info.state == Kernel::Svc::MemoryState::Free) {
return " ";
}
switch (info.permission) {
case Kernel::Svc::MemoryPermission::ReadExecute:
return "r-x";
case Kernel::Svc::MemoryPermission::Read:
return "r--";
case Kernel::Svc::MemoryPermission::ReadWrite:
return "rw-";
default:
return "---";
}
}
static VAddr GetModuleEnd(Kernel::KPageTable& page_table, VAddr base) {
Kernel::Svc::MemoryInfo mem_info;
VAddr cur_addr{base};
// Expect: r-x Code (.text)
mem_info = page_table.QueryInfo(cur_addr).GetSvcMemoryInfo();
cur_addr = mem_info.base_address + mem_info.size;
if (mem_info.state != Kernel::Svc::MemoryState::Code ||
mem_info.permission != Kernel::Svc::MemoryPermission::ReadExecute) {
return cur_addr - 1;
}
// Expect: r-- Code (.rodata)
mem_info = page_table.QueryInfo(cur_addr).GetSvcMemoryInfo();
cur_addr = mem_info.base_address + mem_info.size;
if (mem_info.state != Kernel::Svc::MemoryState::Code ||
mem_info.permission != Kernel::Svc::MemoryPermission::Read) {
return cur_addr - 1;
}
// Expect: rw- CodeData (.data)
mem_info = page_table.QueryInfo(cur_addr).GetSvcMemoryInfo();
cur_addr = mem_info.base_address + mem_info.size;
return cur_addr - 1;
}
void GDBStub::HandleRcmd(const std::vector<u8>& command) {
std::string_view command_str{reinterpret_cast<const char*>(&command[0]), command.size()};
std::string reply;
auto* process = system.CurrentProcess();
auto& page_table = process->PageTable();
if (command_str == "get info") {
Loader::AppLoader::Modules modules;
system.GetAppLoader().ReadNSOModules(modules);
reply = fmt::format("Process: {:#x} ({})\n"
"Program Id: {:#018x}\n",
process->GetProcessID(), process->GetName(), process->GetProgramID());
reply +=
fmt::format("Layout:\n"
" Alias: {:#012x} - {:#012x}\n"
" Heap: {:#012x} - {:#012x}\n"
" Aslr: {:#012x} - {:#012x}\n"
" Stack: {:#012x} - {:#012x}\n"
"Modules:\n",
page_table.GetAliasRegionStart(), page_table.GetAliasRegionEnd(),
page_table.GetHeapRegionStart(), page_table.GetHeapRegionEnd(),
page_table.GetAliasCodeRegionStart(), page_table.GetAliasCodeRegionEnd(),
page_table.GetStackRegionStart(), page_table.GetStackRegionEnd());
for (const auto& [vaddr, name] : modules) {
reply += fmt::format(" {:#012x} - {:#012x} {}\n", vaddr,
GetModuleEnd(page_table, vaddr), name);
}
} else if (command_str == "get mappings") {
reply = "Mappings:\n";
VAddr cur_addr = 0;
while (true) {
using MemoryAttribute = Kernel::Svc::MemoryAttribute;
auto mem_info = page_table.QueryInfo(cur_addr).GetSvcMemoryInfo();
if (mem_info.state != Kernel::Svc::MemoryState::Inaccessible ||
mem_info.base_address + mem_info.size - 1 != std::numeric_limits<u64>::max()) {
const char* state = GetMemoryStateName(mem_info.state);
const char* perm = GetMemoryPermissionString(mem_info);
const char l = True(mem_info.attribute & MemoryAttribute::Locked) ? 'L' : '-';
const char i = True(mem_info.attribute & MemoryAttribute::IpcLocked) ? 'I' : '-';
const char d = True(mem_info.attribute & MemoryAttribute::DeviceShared) ? 'D' : '-';
const char u = True(mem_info.attribute & MemoryAttribute::Uncached) ? 'U' : '-';
reply +=
fmt::format(" {:#012x} - {:#012x} {} {} {}{}{}{} [{}, {}]\n",
mem_info.base_address, mem_info.base_address + mem_info.size - 1,
perm, state, l, i, d, u, mem_info.ipc_count, mem_info.device_count);
}
const uintptr_t next_address = mem_info.base_address + mem_info.size;
if (next_address <= cur_addr) {
break;
}
cur_addr = next_address;
}
} else if (command_str == "help") {
reply = "Commands:\n get info\n get mappings\n";
} else {
reply = "Unknown command.\nCommands:\n get info\n get mappings\n";
}
std::span<const u8> reply_span{reinterpret_cast<u8*>(&reply.front()), reply.size()};
SendReply(Common::HexToString(reply_span, false));
}
Kernel::KThread* GDBStub::GetThreadByID(u64 thread_id) {
const auto& threads{system.GlobalSchedulerContext().GetThreadList()};
for (auto* thread : threads) {

1
src/core/debugger/gdbstub.h
View file

@ -32,6 +32,7 @@ private:
void ExecuteCommand(std::string_view packet, std::vector<DebuggerAction>& actions);
void HandleVCont(std::string_view command, std::vector<DebuggerAction>& actions);
void HandleQuery(std::string_view command);
void HandleRcmd(const std::vector<u8>& command);
void HandleBreakpointInsert(std::string_view command);
void HandleBreakpointRemove(std::string_view command);
std::vector<char>::const_iterator CommandEnd() const;

3
src/core/hle/kernel/k_page_table.h
View file

@ -320,6 +320,9 @@ public:
constexpr VAddr GetAliasCodeRegionStart() const {
return m_alias_code_region_start;
}
constexpr VAddr GetAliasCodeRegionEnd() const {
return m_alias_code_region_end;
}
constexpr VAddr GetAliasCodeRegionSize() const {
return m_alias_code_region_end - m_alias_code_region_start;
}