@@ -0,0 +1,71 @@
+#include "GDBController.h"
+
+#include "GameController.h"
+
+using namespace QGBA;
+
+GDBController::GDBController(GameController* controller, QObject* parent)
+	: QObject(parent)
+	, m_gameController(controller)
+	, m_port(2345)
+	, m_bindAddress(0)
+{
+	GDBStubCreate(&m_gdbStub);
+}
+
+ushort GDBController::port() {
+	return m_port;
+}
+
+uint32_t GDBController::bindAddress() {
+	return m_bindAddress;
+}
+
+bool GDBController::isAttached() {
+	return m_gameController->debugger() == &m_gdbStub.d;
+}
+
+void GDBController::setPort(ushort port) {
+	m_port = port;
+}
+
+void GDBController::setBindAddress(uint32_t bindAddress) {
+	m_bindAddress = bindAddress;
+}
+
+void GDBController::attach() {
+	if (isAttached()) {
+		return;
+	}
+	m_gameController->setDebugger(&m_gdbStub.d);
+}
+
+void GDBController::detach() {
+	if (!isAttached()) {
+		return;
+	}
+	bool wasPaused = m_gameController->isPaused();
+	disconnect(m_gameController, SIGNAL(frameAvailable(const uint32_t*)), this, SLOT(updateGDB()));
+	m_gameController->setPaused(true);
+	GDBStubShutdown(&m_gdbStub);
+	m_gameController->setDebugger(nullptr);
+	m_gameController->setPaused(wasPaused);
+}
+
+void GDBController::listen() {
+	if (!isAttached()) {
+		attach();
+	}
+	bool wasPaused = m_gameController->isPaused();
+	connect(m_gameController, SIGNAL(frameAvailable(const uint32_t*)), this, SLOT(updateGDB()));
+	m_gameController->setPaused(true);
+	GDBStubListen(&m_gdbStub, m_port, m_bindAddress);
+	m_gameController->setPaused(wasPaused);
+}
+
+void GDBController::updateGDB() {
+	bool wasPaused = m_gameController->isPaused();
+	m_gameController->setPaused(true);
+	GDBStubUpdate(&m_gdbStub);
+	m_gameController->setPaused(wasPaused);
+}

@@ -0,0 +1,44 @@
+#ifndef QGBA_GDB_CONTROLLER
+#define QGBA_GDB_CONTROLLER
+
+#include <QObject>
+
+extern "C" {
+#include "gdb-stub.h"
+}
+
+namespace QGBA {
+
+class GameController;
+
+class GDBController : public QObject {
+Q_OBJECT
+
+public:
+	GDBController(GameController* controller, QObject* parent = nullptr);
+
+public:
+	ushort port();
+	uint32_t bindAddress();
+	bool isAttached();
+
+public slots:
+	void setPort(ushort port);
+	void setBindAddress(uint32_t bindAddress);
+	void attach();
+	void detach();
+	void listen();
+
+private slots:
+	void updateGDB();
+
+private:
+	GDBStub m_gdbStub;
+	GameController* m_gameController;
+
+	ushort m_port;
+	uint32_t m_bindAddress;
+};
+
+}
+#endif

@@ -0,0 +1,96 @@
+#include "GDBWindow.h"
+
+#include <QGridLayout>
+#include <QGroupBox>
+#include <QLabel>
+#include <QLineEdit>
+#include <QPushButton>
+#include <QVBoxLayout>
+
+#include "GDBController.h"
+
+using namespace QGBA;
+
+GDBWindow::GDBWindow(GDBController* controller, QWidget* parent)
+	: QWidget(parent)
+	, m_gdbController(controller)
+{
+	setWindowFlags(windowFlags() & ~Qt::WindowFullscreenButtonHint);
+	QVBoxLayout* mainSegment = new QVBoxLayout;
+	setLayout(mainSegment);
+	QGroupBox* settings = new QGroupBox(tr("Server settings"));
+	mainSegment->addWidget(settings);
+
+	QGridLayout* settingsGrid = new QGridLayout;
+	settings->setLayout(settingsGrid);
+
+	QLabel* portLabel = new QLabel(tr("Local port"));
+	settingsGrid->addWidget(portLabel, 0, 0, Qt::AlignRight);
+	QLabel* bindAddressLabel = new QLabel(tr("Bind address"));
+	settingsGrid->addWidget(bindAddressLabel, 1, 0, Qt::AlignRight);
+
+	m_portEdit = new QLineEdit("2345");
+	m_portEdit->setMaxLength(5);
+	connect(m_portEdit, SIGNAL(textChanged(const QString&)), this, SLOT(portChanged(const QString&)));
+	settingsGrid->addWidget(m_portEdit, 0, 1, Qt::AlignLeft);
+
+	m_bindAddressEdit = new QLineEdit("0.0.0.0");
+	m_bindAddressEdit->setMaxLength(15);
+	connect(m_bindAddressEdit, SIGNAL(textChanged(const QString&)), this, SLOT(bindAddressChanged(const QString&)));
+	settingsGrid->addWidget(m_bindAddressEdit, 1, 1, Qt::AlignLeft);
+
+	m_startStopButton = new QPushButton(tr("Start"));
+	connect(m_startStopButton, SIGNAL(clicked()), m_gdbController, SLOT(listen()));
+	connect(m_startStopButton, SIGNAL(clicked()), this, SLOT(started()));
+	mainSegment->addWidget(m_startStopButton);
+}
+
+void GDBWindow::portChanged(const QString& portString) {
+	bool ok = false;
+	ushort port = portString.toUShort(&ok);
+	if (ok) {
+		m_gdbController->setPort(port);
+	}
+}
+
+void GDBWindow::bindAddressChanged(const QString& bindAddressString) {
+	bool ok = false;
+	QStringList parts = bindAddressString.split('.');
+	if (parts.length() != 4) {
+		return;
+	}
+	int i;
+	uint32_t address = 0;
+	for (i = 0; i < 4; ++i) {
+		ushort octet = parts[i].toUShort(&ok);
+		if (!ok) {
+			return;
+		}
+		if (octet > 0xFF) {
+			return;
+		}
+		address <<= 8;
+		address += octet;
+	}
+	m_gdbController->setBindAddress(address);
+}
+
+void GDBWindow::started() {
+	m_portEdit->setEnabled(false);
+	m_bindAddressEdit->setEnabled(false);
+	m_startStopButton->setText(tr("Stop"));
+	disconnect(m_startStopButton, SIGNAL(clicked()), m_gdbController, SLOT(listen()));
+	disconnect(m_startStopButton, SIGNAL(clicked()), this, SLOT(started()));
+	connect(m_startStopButton, SIGNAL(clicked()), m_gdbController, SLOT(detach()));
+	connect(m_startStopButton, SIGNAL(clicked()), this, SLOT(stopped()));
+}
+
+void GDBWindow::stopped() {
+	m_portEdit->setEnabled(true);
+	m_bindAddressEdit->setEnabled(true);
+	m_startStopButton->setText(tr("Start"));
+	disconnect(m_startStopButton, SIGNAL(clicked()), m_gdbController, SLOT(detach()));
+	disconnect(m_startStopButton, SIGNAL(clicked()), this, SLOT(stopped()));
+	connect(m_startStopButton, SIGNAL(clicked()), m_gdbController, SLOT(listen()));
+	connect(m_startStopButton, SIGNAL(clicked()), this, SLOT(started()));
+}

@@ -0,0 +1,36 @@
+#ifndef QGBA_GDB_WINDOW
+#define QGBA_GDB_WINDOW
+
+#include <QWidget>
+
+class QLineEdit;
+class QPushButton;
+
+namespace QGBA {
+
+class GDBController;
+
+class GDBWindow : public QWidget {
+Q_OBJECT
+
+public:
+	GDBWindow(GDBController* controller, QWidget* parent = nullptr);
+
+private slots:
+	void portChanged(const QString&);
+	void bindAddressChanged(const QString&);
+
+	void started();
+	void stopped();
+
+private:
+	GDBController* m_gdbController;
+
+	QLineEdit* m_portEdit;
+	QLineEdit* m_bindAddressEdit;
+	QPushButton* m_startStopButton;
+};
+
+}
+
+#endif