Add thread debugger

CMakeLists.txt

@@ -732,10 +732,12 @@ if(NOT BUILD_HYDRA_CORE AND NOT BUILD_LIBRETRO_CORE)
         set(FRONTEND_SOURCE_FILES src/panda_qt/main.cpp src/panda_qt/screen.cpp src/panda_qt/main_window.cpp src/panda_qt/about_window.cpp
             src/panda_qt/config_window.cpp src/panda_qt/zep.cpp src/panda_qt/text_editor.cpp src/panda_qt/cheats_window.cpp src/panda_qt/mappings.cpp
             src/panda_qt/patch_window.cpp src/panda_qt/elided_label.cpp src/panda_qt/shader_editor.cpp src/panda_qt/translations.cpp
+            src/panda_qt/thread_debugger.cpp
         )
         set(FRONTEND_HEADER_FILES include/panda_qt/screen.hpp include/panda_qt/main_window.hpp include/panda_qt/about_window.hpp
             include/panda_qt/config_window.hpp include/panda_qt/text_editor.hpp include/panda_qt/cheats_window.hpp
             include/panda_qt/patch_window.hpp include/panda_qt/elided_label.hpp include/panda_qt/shader_editor.hpp
+            include/panda_qt/thread_debugger.hpp
         )
 
         source_group("Source Files\\Qt" FILES ${FRONTEND_SOURCE_FILES})

include/emulator.hpp

@@ -127,6 +127,7 @@ class Emulator {
 	Scheduler& getScheduler() { return scheduler; }
 	Memory& getMemory() { return memory; }
 	AudioDeviceInterface& getAudioDevice() { return audioDevice; }
+	Kernel& getKernel() { return kernel; }
 
 	RendererType getRendererType() const { return config.rendererType; }
 	Renderer* getRenderer() { return gpu.getRenderer(); }

include/kernel/kernel.hpp

@@ -225,9 +225,7 @@ public:
 		return handleCounter++;
 	}
 
-	std::vector<KernelObject>& getObjects() {
-		return objects;
-	}
+	std::vector<KernelObject>& getObjects() { return objects; }
 
 	// Get pointer to the object with the specified handle
 	KernelObject* getObject(Handle handle) {
@@ -255,4 +253,14 @@ public:
 	void clearInstructionCache();
 	void clearInstructionCacheRange(u32 start, u32 size);
 	u32 getSharedFontVaddr();
+
+	// For debuggers: Returns information about the main process' (alive) threads in a vector for the frontend to display
+	std::vector<Thread> getMainProcessThreads();
+
+	// For debuggers: Sets the entrypoint and initial SP for the main thread (thread 0) so that the debugger can display them
+	void setMainThreadEntrypointAndSP(u32 entrypoint, u32 initialSP) {
+		auto& t = threads[0];
+		t.entrypoint = entrypoint;
+		t.initialSP = initialSP;
+	}
 };

include/panda_qt/main_window.hpp

@@ -21,6 +21,7 @@
 #include "panda_qt/screen.hpp"
 #include "panda_qt/shader_editor.hpp"
 #include "panda_qt/text_editor.hpp"
+#include "panda_qt/thread_debugger.hpp"
 #include "services/hid.hpp"
 
 struct CheatMessage {
@@ -109,6 +110,7 @@ class MainWindow : public QMainWindow {
 	TextEditorWindow* luaEditor;
 	PatchWindow* patchWindow;
 	ShaderEditorWindow* shaderEditor;
+	ThreadDebugger* threadDebugger;
 
 	// We use SDL's game controller API since it's the sanest API that supports as many controllers as possible
 	SDL_GameController* gameController = nullptr;
@@ -157,4 +159,7 @@ class MainWindow : public QMainWindow {
 
 	void handleScreenResize(u32 width, u32 height);
 	void handleTouchscreenPress(QMouseEvent* event);
+
+  signals:
+	void emulatorPaused();
 };

include/panda_qt/thread_debugger.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <QString>
+#include <QTableWidget>
+#include <QTimer>
+#include <QVBoxLayout>
+#include <QtWidgets>
+#include <atomic>
+#include <chrono>
+#include <thread>
+
+#include "emulator.hpp"
+
+class ThreadDebugger : public QWidget {
+	Q_OBJECT
+	Emulator* emu;
+
+	QVBoxLayout* mainLayout;
+	QTableWidget* threadTable;
+
+  public:
+	ThreadDebugger(Emulator* emu, QWidget* parent = nullptr);
+	void update();
+
+  private:
+	void setListItem(int row, int column, const QString& str);
+	void setListItem(int row, int column, const std::string& str);
+};

src/core/kernel/idle_thread.cpp

@@ -1,4 +1,5 @@
 #include <cstring>
+
 #include "arm_defs.hpp"
 #include "kernel.hpp"
 
@@ -40,6 +41,7 @@ void Kernel::setupIdleThread() {
 	std::memcpy(&mem.getFCRAM()[fcramIndex], idleThreadCode, sizeof(idleThreadCode));
 
 	t.entrypoint = codeAddress;
+	t.initialSP = 0;
 	t.tlsBase = 0;
 	t.gprs[13] = 0;  // Set SP & LR to 0 just in case. The idle thread should never access memory, but let's be safe
 	t.gprs[14] = 0;

src/core/kernel/threads.cpp

@@ -1,3 +1,4 @@
+#include <algorithm>
 #include <bit>
 #include <cassert>
 #include <cstring>
@@ -697,3 +698,18 @@ bool Kernel::shouldWaitOnObject(KernelObject* object) {
 			return true;
 	}
 }
+
+std::vector<Thread> Kernel::getMainProcessThreads() {
+	// Sort the thread indices so that they appear nicer in the debugger
+	auto indices = threadIndices;
+	std::sort(indices.begin(), indices.end());
+
+	std::vector<Thread> ret;
+	ret.reserve(indices.size());
+
+	for (const auto& index : indices) {
+		ret.push_back(threads[index]);
+	}
+
+	return ret;
+}

src/emulator.cpp

@@ -272,6 +272,11 @@ bool Emulator::loadROM(const std::filesystem::path& path) {
 		romType = ROMType::None;
 	}
 
+	if (success) {
+		// Update the main thread entrypoint and SP so that the thread debugger can display them.
+		kernel.setMainThreadEntrypointAndSP(cpu.getReg(15), cpu.getReg(13));
+	}
+
 	resume();  // Start the emulator
 	return success;
 }

src/panda_qt/main_window.cpp

@@ -66,6 +66,7 @@ MainWindow::MainWindow(QApplication* app, QWidget* parent) : QMainWindow(parent)
 	auto cheatsEditorAction = toolsMenu->addAction(tr("Open Cheats Editor"));
 	auto patchWindowAction = toolsMenu->addAction(tr("Open Patch Window"));
 	auto shaderEditorAction = toolsMenu->addAction(tr("Open Shader Editor"));
+	auto threadDebuggerAction = toolsMenu->addAction(tr("Open Thread Debugger"));
 	auto dumpDspFirmware = toolsMenu->addAction(tr("Dump loaded DSP firmware"));
 
 	connect(dumpRomFSAction, &QAction::triggered, this, &MainWindow::dumpRomFS);
@@ -73,8 +74,11 @@ MainWindow::MainWindow(QApplication* app, QWidget* parent) : QMainWindow(parent)
 	connect(shaderEditorAction, &QAction::triggered, this, [this]() { shaderEditor->show(); });
 	connect(cheatsEditorAction, &QAction::triggered, this, [this]() { cheatsEditor->show(); });
 	connect(patchWindowAction, &QAction::triggered, this, [this]() { patchWindow->show(); });
+	connect(threadDebuggerAction, &QAction::triggered, this, [this]() { threadDebugger->show(); });
 	connect(dumpDspFirmware, &QAction::triggered, this, &MainWindow::dumpDspFirmware);
 
+	connect(this, &MainWindow::emulatorPaused, this, [this]() { threadDebugger->update(); }, Qt::BlockingQueuedConnection);
+
 	auto aboutAction = aboutMenu->addAction(tr("About Panda3DS"));
 	aboutAction->setMenuRole(QAction::AboutRole);
 	connect(aboutAction, &QAction::triggered, this, &MainWindow::showAboutMenu);
@@ -89,6 +93,7 @@ MainWindow::MainWindow(QApplication* app, QWidget* parent) : QMainWindow(parent)
 	patchWindow = new PatchWindow(this);
 	luaEditor = new TextEditorWindow(this, "script.lua", "");
 	shaderEditor = new ShaderEditorWindow(this, "shader.glsl", "");
+	threadDebugger = new ThreadDebugger(emu, this);
 
 	shaderEditor->setEnable(emu->getRenderer()->supportsShaderReload());
 	if (shaderEditor->supported) {
@@ -381,9 +386,19 @@ void MainWindow::dispatchMessage(const EmulatorMessage& message) {
 			delete message.cheat.c;
 		} break;
 
-		case MessageType::Pause: emu->pause(); break;
 		case MessageType::Resume: emu->resume(); break;
-		case MessageType::TogglePause: emu->togglePause(); break;
+		case MessageType::Pause:
+			emu->pause();
+			emit emulatorPaused();
+			break;
+
+		case MessageType::TogglePause:
+			emu->togglePause();
+			if (!emu->running) {
+				emit emulatorPaused();
+			};
+			break;
+
 		case MessageType::Reset: emu->reset(Emulator::ReloadOption::Reload); break;
 		case MessageType::PressKey: emu->getServiceManager().getHID().pressKey(message.key.key); break;
 		case MessageType::ReleaseKey: emu->getServiceManager().getHID().releaseKey(message.key.key); break;

src/panda_qt/thread_debugger.cpp

@@ -0,0 +1,76 @@
+#include "panda_qt/thread_debugger.hpp"
+
+#include <fmt/format.h>
+
+static QString threadStatusToQString(ThreadStatus status) {
+	switch (status) {
+		case ThreadStatus::Running: return QObject::tr("Running");
+		case ThreadStatus::Ready: return QObject::tr("Ready");
+		case ThreadStatus::WaitArbiter: return QObject::tr("Waiting on arbiter");
+		case ThreadStatus::WaitSleep: return QObject::tr("Sleeping");
+		case ThreadStatus::WaitSync1: return QObject::tr("WaitSync (1)");
+		case ThreadStatus::WaitSyncAny: return QObject::tr("WaitSync (Any)");
+		case ThreadStatus::WaitSyncAll: return QObject::tr("WaitSync (All)");
+		case ThreadStatus::WaitIPC: return QObject::tr("Waiting for IPC");
+		case ThreadStatus::Dormant: return QObject::tr("Dormant");
+		case ThreadStatus::Dead: return QObject::tr("Dead");
+		default: return QObject::tr("Unknown thread status");
+	}
+}
+
+ThreadDebugger::ThreadDebugger(Emulator* emu, QWidget* parent) : emu(emu), QWidget(parent, Qt::Window) {
+	setWindowTitle(tr("Thread Debugger"));
+	resize(700, 600);
+
+	mainLayout = new QVBoxLayout(this);
+	threadTable = new QTableWidget(this);
+	threadTable->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
+
+	mainLayout->addWidget(threadTable);
+}
+
+void ThreadDebugger::update() {
+	threadTable->clear();
+
+	threadTable->setSelectionMode(QAbstractItemView::NoSelection);
+	threadTable->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
+	threadTable->setHorizontalScrollMode(QAbstractItemView::ScrollPerPixel);
+	threadTable->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+
+	threadTable->setColumnCount(5);
+	threadTable->verticalHeader()->setVisible(false);
+	threadTable->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
+	threadTable->setHorizontalHeaderLabels(QStringList({"ID", "Status", "PC", "Entrypoint", "Stack Top"}));
+
+	const auto threads = emu->getKernel().getMainProcessThreads();
+	const usize count = threads.size();
+	threadTable->setRowCount(count);
+
+	for (int i = 0; i < count; i++) {
+		const auto& thread = threads[i];
+		setListItem(i, 0, fmt::format("{}", thread.index));
+		setListItem(i, 1, threadStatusToQString(thread.status));
+		setListItem(i, 2, fmt::format("{:08X}", thread.gprs[15]));
+		setListItem(i, 3, fmt::format("{:08X}", thread.entrypoint));
+		setListItem(i, 4, fmt::format("{:08X}", thread.initialSP));
+	}
+}
+
+void ThreadDebugger::setListItem(int row, int column, const std::string& str) { setListItem(row, column, QString::fromStdString(str)); }
+
+void ThreadDebugger::setListItem(int row, int column, const QString& str) {
+	QTableWidgetItem* item = new QTableWidgetItem();
+	QWidget* widget = new QWidget(this);
+	QVBoxLayout* layout = new QVBoxLayout(widget);
+	QLabel* label = new QLabel(widget);
+
+	layout->setAlignment(Qt::AlignVCenter);
+	layout->setContentsMargins(5, 0, 5, 0);
+
+	label->setText(str);
+	layout->addWidget(label);
+	widget->setLayout(layout);
+
+	threadTable->setItem(row, column, item);
+	threadTable->setCellWidget(row, column, widget);
+}