gdbstub_plugin/src/debugger.cpp

#include "cafe/coreinit.h"
#include "cafe/nsysnet.h"
#include "cafe/vpad.h"
#include "kernel.h"

#include "debugger.h"
#include "exceptions.h"
#include "screen.h"
#include "input.h"

#include <cstring>


bool BreakPoint::isRange(uint32_t addr, uint32_t length) {
	return address >= addr && address <= addr + length - 1;
}


BreakPoint *BreakPointMgr::find(uint32_t addr, bool includeSpecial) {
	BreakPoint *bp = breakpoints.find(addr);
	if (!bp && includeSpecial) {
		bp = special.find(addr);
	}
	return bp;
}

BreakPoint *BreakPointMgr::findRange(uint32_t addr, uint32_t length, int *index, bool includeSpecial) {
	BreakPoint *bp = breakpoints.findRange(addr, length, index);
	if (bp) {
		return bp;
	}
	
	if (includeSpecial) {
		int temp = *index - breakpoints.size();
		bp = special.findRange(addr, length, &temp);
		*index = temp + breakpoints.size();
		return bp;
	}
	
	return nullptr;
}

SpecialBreakPoint *BreakPointMgr::findSpecial(uint32_t addr, OSThread *thread) {
	int index = 0;
	SpecialBreakPoint *bp = special.findRange(addr, 4, &index);
	while (bp) {
		if (bp->thread == thread) {
			return bp;
		}
		bp = special.findRange(addr, 4, &index);
	}
	return nullptr;
}

bool BreakPointMgr::isCustom(uint32_t addr) {
	return find(addr, false);
}

bool BreakPointMgr::isSpecial(uint32_t addr) {
	return find(addr, true) && !find(addr, false);
}

bool BreakPointMgr::isSoftware(uint32_t addr) {
	uint32_t instr = getInstr(addr);
	uint32_t opcode = instr >> 26;
	if (opcode == 3) { //twi
		return true;
	}
	else if (opcode == 31) {
		return (instr & 0x7FF) == 8; //tw
	}
	return false;
}

void BreakPointMgr::disable(BreakPoint *bp) {
	uint32_t address = bp->address;
	if (bp->address) {
		bp->address = 0;
		if (!find(address, true)) {
			KernelWriteU32(address, bp->instruction);
		}
		bp->instruction = 0;
	}
}

void BreakPointMgr::enable(BreakPoint *bp, uint32_t addr) {
	BreakPoint *other = find(addr, true);
	if (other) {
		bp->instruction = other->instruction;
	}
	else {
		bp->instruction = *(uint32_t *)addr;
		KernelWriteU32(addr, TRAP);
	}
	bp->address = addr;
}

void BreakPointMgr::init() {
	OSInitMutex(&mutex);
}

void BreakPointMgr::lock() {
	OSLockMutex(&mutex);
}

void BreakPointMgr::unlock() {
	OSUnlockMutex(&mutex);
}

void BreakPointMgr::cleanup() {
	lock();
	breakpoints.cleanup();
	special.cleanup();
	unlock();
}

void BreakPointMgr::read(void *buffer, uint32_t addr, uint32_t length) {
	lock();
	
	memcpy(buffer, (void *)addr, length);
	
	int index = 0;
	BreakPoint *bp = findRange(addr, length, &index, true);
	while (bp) {
		uint32_t offset = bp->address - addr;
		char *bufptr = (char *)buffer + offset;
		if (bp->address > addr + length - 4) {
			uint32_t value = bp->instruction;
			for (int i = 0; i < length - offset; i++) {
				bufptr[i] = value >> 24;
				value <<= 8;
			}
		}
		else {
			*(uint32_t *)bufptr = bp->instruction;
		}
		bp = findRange(addr, length, &index, true);
	}
	unlock();
}

void BreakPointMgr::write(const void *buffer, uint32_t addr, uint32_t length) {
	lock();
	
	length = length & ~3;
	
	int index = 0;
	if (!findRange(addr, length, &index, true)) {
		KernelWrite(addr, buffer, length);
	}
	else {
		for (uint32_t i = 0; i < length; i += 4) {
			uint32_t value = *(uint32_t *)((char *)buffer + i);

			int index = 0;
			BreakPoint *bp = findRange(addr + i, 4, &index, true);
			if (!bp) {
				KernelWriteU32(addr + i, value);
			}
			else {
				while (bp) {
					bp->instruction = value;
					bp = findRange(addr + i, 4, &index, true);
				}
			}
		}
	}
	
	unlock();
}

void BreakPointMgr::toggle(uint32_t addr) {
	lock();
	
	BreakPoint *bp = find(addr, false);
	if (bp) {
		disable(bp);
	}
	else {
		BreakPoint *bp = breakpoints.alloc();
		bp->isSpecial = false;
		enable(bp, addr);
	}
	
	unlock();
}

uint32_t BreakPointMgr::getInstr(uint32_t addr) {
	lock();
	uint32_t instruction;
	BreakPoint *bp = find(addr, true);
	if (bp) {
		instruction = bp->instruction;
	}
	else {
		instruction = *(uint32_t *)addr;
	}
	unlock();
	return instruction;
}

void BreakPointMgr::clearSpecial(OSThread *thread) {
	lock();
	for (int i = 0; i < special.size(); i++) {
		SpecialBreakPoint *bp = special[i];
		if (bp->thread == thread) {
			disable(bp);
		}
	}
	unlock();
}

void BreakPointMgr::predictStep(ExceptionState *state, bool stepOver) {
	lock();
	
	uint32_t address = state->context.srr0;
	uint32_t instruction = getInstr(address);
	
	uint32_t target1 = address + 4;
	uint32_t target2 = 0;
	
	uint8_t opcode = instruction >> 26;
	if (opcode == 18) { //Branch
		bool AA = instruction & 2;
		bool LK = instruction & 1;
		
		uint32_t LI = instruction & 0x3FFFFFC;
		if (LI & 0x2000000) LI -= 0x4000000;
		
		if (!LK || !stepOver) {
			if (AA) target1 = LI;
			else {
				target1 = address + LI;
			}
		}
	}
	
	else if (opcode == 16) { //Conditional branch
		bool AA = instruction & 2;
		bool LK = instruction & 1;
		
		uint32_t BD = instruction & 0xFFFC;
		if (BD & 0x8000) BD -= 0x10000;
		
		if (!LK || !stepOver) {
			if (AA) target2 = BD;
			else {
				target2 = address + BD;
			}
		}
	}
	
	else if (opcode == 19) { //Conditional branch to lr/ctr
		uint16_t XO = (instruction >> 1) & 0x3FF;
		bool LK = instruction & 1;
		
		if (!LK || !stepOver) {
			if (XO == 16) target2 = state->context.lr;
			else if (XO == 528) target2 = state->context.ctr;
		}
	}
	
	SpecialBreakPoint *bp = special.alloc();
	bp->isSpecial = true;
	bp->thread = state->thread;
	enable(bp, target1);
	
	if (target2) {
		SpecialBreakPoint *bp = special.alloc();
		bp->isSpecial = true;
		bp->thread = state->thread;
		enable(bp, target2);
	}
	
	unlock();
}


bool ExceptionState::isBreakpoint() {
	return type == PROGRAM && context.srr1 & 0x20000;
}

void ExceptionState::resume() {
	OSLoadContext(&context);
}


void ExceptionMgr::init() {
	OSInitMutex(&mutex);
}

void ExceptionMgr::lock() {
	OSLockMutex(&mutex);
}

void ExceptionMgr::unlock() {
	OSUnlockMutex(&mutex);
}

void ExceptionMgr::cleanup() {
	OSMessage message;
	message.message = Debugger::STEP_CONTINUE;
	
	lock();
	
	for (int i = 0; i < list.size(); i++) {
		ExceptionState *state = list[i];
		if (state->isPaused) {
			OSSendMessage(&state->queue, &message, OS_MESSAGE_FLAGS_NONE);
		}
	}
	
	unlock();
}

ExceptionState *ExceptionMgr::find(OSThread *thread) {
	lock();
	for (int i = 0; i < list.size(); i++) {
		ExceptionState *state = list[i];
		if (state->thread == thread) {
			unlock();
			return state;
		}
	}
	unlock();
	return nullptr;
}

ExceptionState *ExceptionMgr::findOrCreate(OSThread *thread) {
	lock();
	ExceptionState *state = find(thread);
	if (!state) {
		state = new ExceptionState();
		state->thread = thread;
		state->isPaused = false;
		OSInitMessageQueue(&state->queue, &state->message, 1);
		list.push_back(state);
	}
	unlock();
	return state;
}


uint32_t StepMgr::buffer[96];

void StepMgr::init() {
	OSInitMutex(&mutex);
	usedMask = 0;
}

void StepMgr::lock() {
	OSLockMutex(&mutex);
}

void StepMgr::unlock() {
	OSUnlockMutex(&mutex);
}

uint32_t *StepMgr::alloc() {
	lock();
	int index = 0;
	uint32_t mask = usedMask;
	while (mask & 1) {
		mask >>= 1;
		index++;
	}
	usedMask |= 1 << index;
	unlock();
	
	if (index == 32) {
		OSFatal("Displaced step allocation failed");
	}
	return &buffer[index * 3];
}

void StepMgr::free(int index) {
	lock();
	usedMask &= ~(1 << index);
	unlock();
}

void StepMgr::branchConditional(ExceptionState *state, uint32_t instruction, uint32_t target, bool checkCtr) {
	Bits<5> BO = (instruction >> 21) & 0x1F;
	Bits<32> CR = state->context.cr;
	
	uint32_t BI = (instruction >> 16) & 0x1F;
	bool LK = instruction & 1;
	
	if (LK) {
		state->context.lr = state->context.srr0 + 4;
	}

	bool ctr_ok = true;
	if (checkCtr) {
		if (!BO[2]) {
			state->context.ctr--;
		}
		ctr_ok = BO[2] || ((state->context.ctr != 0) ^ BO[3]);
	}
	
	bool cond_ok = BO[0] || (CR[BI] == BO[1]);
	if (ctr_ok && cond_ok) {
		state->context.srr0 = target;
	}
}

void StepMgr::singleStep(ExceptionState *state, uint32_t instruction) {
	uint8_t opcode = instruction >> 26;
	
	if (opcode == 18) { //Branch
		bool AA = instruction & 2;
		bool LK = instruction & 1;
		
		uint32_t LI = instruction & 0x3FFFFFC;
		if (LI & 0x2000000) LI -= 0x4000000;
		
		if (LK) {
			state->context.lr = state->context.srr0 + 4;
		}
		
		if (AA) state->context.srr0 = LI;
		else {
			state->context.srr0 += LI;
		}
		return;
	}
	
	if (opcode == 16) { //Conditional branch
		bool AA = instruction & 2;
		
		uint32_t BD = instruction & 0xFFFC;
		if (BD & 0x8000) BD -= 0x10000;
		
		uint32_t target;
		if (AA) target = BD;
		else {
			target = state->context.srr0 + BD;
		}
		
		branchConditional(state, instruction, target, true);
		return;
	}
	
	if (opcode == 19) { //Conditional branch to lr/ctr
		uint16_t XO = (instruction >> 1) & 0x3FF;
		
		uint32_t target;
		if (XO == 16) {
			branchConditional(state, instruction, state->context.lr, true);
			return;
		}
		else if (XO == 528) {
			branchConditional(state, instruction, state->context.ctr, false);
			return;
		}
	}
	
	uint32_t *ptr = alloc();
	ptr[0] = instruction;
	ptr[1] = TRAP;
	ptr[2] = state->context.srr0;
	DCFlushRange(ptr, 12);
	ICInvalidateRange(ptr, 12);
	state->context.srr0 = (uint32_t)ptr;
}

void StepMgr::handleBreakPoint(ExceptionState *state) {
	uint32_t start = (uint32_t)buffer;
	uint32_t end = (uint32_t)buffer + sizeof(buffer);
	
	uint32_t addr = state->context.srr0;
	if (addr >= start && addr < end) {
		int offset = addr - start;
		if (offset % 12 != 4) {
			char buffer[100];
			snprintf(buffer, 100, "Unexpected srr0 after displaced step: %08X", addr);
			OSFatal(buffer);
		}
		
		int index = offset / 12;
		state->context.srr0 = buffer[index * 3 + 2] + 4;
		free(index);

		state->resume();
	}
}

void StepMgr::adjustAddress(ExceptionState *state) {
	uint32_t start = (uint32_t)buffer;
	uint32_t end = (uint32_t)buffer + sizeof(buffer);
	
	uint32_t addr = state->context.srr0;
	if (addr >= start && addr < end) {
		int index = (addr - start) / 12;
		state->context.srr0 = buffer[index * 3 + 2];
	}
}


bool Debugger::checkDataRead(uint32_t addr, uint32_t length) {
	uint32_t memStart, memSize;
	OSGetMemBound(MEM2, &memStart, &memSize);
	
	uint32_t memEnd = memStart + memSize;
	
	return addr >= 0x10000000 && addr + length <= memEnd;
}

Debugger::StepCommand Debugger::notifyBreak(ExceptionState *state) {
	OSMessage message;
	message.message = ExceptionState::PROGRAM;
	message.args[0] = (uint32_t)&state->context;
	message.args[1] = sizeof(OSContext);
	message.args[2] = (uint32_t)state->thread;
	OSSendMessage(&eventQueue, &message, OS_MESSAGE_FLAGS_BLOCKING);
	
	state->isPaused = true;
	OSReceiveMessage(&state->queue, &message, OS_MESSAGE_FLAGS_BLOCKING);
	state->isPaused = false;
	return (StepCommand)message.message;
}

void Debugger::resumeBreakPoint(ExceptionState *state) {
	uint32_t address = state->context.srr0;
	if (breakpoints.isSoftware(address)) {
		state->context.srr0 += 4;
		state->resume();
	}
	
	uint32_t instruction = breakpoints.getInstr(state->context.srr0);
	stepper.singleStep(state, instruction);
	state->resume();
}

void Debugger::processBreakPoint(ExceptionState *state) {
	StepCommand command = notifyBreak(state);
	if (command == STEP_INTO || command == STEP_OVER) {
		breakpoints.predictStep(state, command == STEP_OVER);
	}
}

void Debugger::handleBreakPoint(ExceptionState *state) {
	if (firstTrap) {
		firstTrap = false;

		Screen screen;
		screen.init();
		screen.drawText(
			0, 0, "Waiting for debugger connection.\n"
			      "Press the home button to continue without debugger.\n"
			      "You can still connect while the game is running."
		);
		screen.flip();
		
		while (!connected) {
			uint32_t buttons = GetInput(VPAD_BUTTON_HOME);
			if (buttons) {
				state->context.srr0 += 4;
				state->resume();
			}
		}
	}
	
	stepper.handleBreakPoint(state);
	
	if (!connected) {
		handleFatalCrash(&state->context, state->type);
	}
	
	uint32_t addr = state->context.srr0;
	bool trap;
	
	breakpoints.lock();
	trap = breakpoints.isCustom(addr) || breakpoints.isSoftware(addr) ||
	       breakpoints.findSpecial(addr, state->thread);
	breakpoints.unlock();
	
	breakpoints.clearSpecial(state->thread);
	if (trap) {
		processBreakPoint(state);
	}
	resumeBreakPoint(state);
}

void Debugger::handleCrash(ExceptionState *state) {
	stepper.adjustAddress(state);
	if (connected) {
		OSMessage message;
		message.message = state->type;
		message.args[0] = (uint32_t)&state->context;
		message.args[1] = sizeof(OSContext);
		message.args[2] = (uint32_t)state->thread;
		OSSendMessage(&eventQueue, &message, OS_MESSAGE_FLAGS_BLOCKING);
		
		while (true) {
			OSReceiveMessage(&state->queue, &message, OS_MESSAGE_FLAGS_BLOCKING);
		}
	}
	else {
		handleFatalCrash(&state->context, state->type);
	}
}

void Debugger::handleFatalCrash(OSContext *context, ExceptionState::Type type) {
	const char *name;
	if (type == ExceptionState::DSI) name = "A DSI";
	else if (type == ExceptionState::ISI) name = "An ISI";
	else {
		name = "A program";
	}
	DumpContext(context, name);
}

void Debugger::handleException(OSContext *context, ExceptionState::Type type) {
	OSThread *thread = OSGetCurrentThread();
	
	if (thread == serverThread) {
		handleFatalCrash(context, type);
	}
	
	ExceptionState *state = exceptions.findOrCreate(thread);
	memcpy(&state->context, context, sizeof(OSContext));
	state->type = type;
	
	delete context;
	
	if (state->isBreakpoint()) {
		handleBreakPoint(state);
	}
	else {
		handleCrash(state);
	}
}

void Debugger::exceptionHandler(OSContext *context, ExceptionState::Type type) {
	debugger->handleException(context, type);
}

bool Debugger::dsiHandler(OSContext *context) {
	OSContext *info = new OSContext();
	memcpy(info, context, sizeof(OSContext));
	context->srr0 = (uint32_t)exceptionHandler;
	context->gpr[3] = (uint32_t)info;
	context->gpr[4] = ExceptionState::DSI;
	return true;
}

bool Debugger::isiHandler(OSContext *context) {
	OSContext *info = new OSContext();
	memcpy(info, context, sizeof(OSContext));
	context->srr0 = (uint32_t)exceptionHandler;
	context->gpr[3] = (uint32_t)info;
	context->gpr[4] = ExceptionState::ISI;
	return true;
}

bool Debugger::programHandler(OSContext *context) {
	OSContext *info = new OSContext();
	memcpy(info, context, sizeof(OSContext));
	context->srr0 = (uint32_t)exceptionHandler;
	context->gpr[3] = (uint32_t)info;
	context->gpr[4] = ExceptionState::PROGRAM;
	return true;
}

void Debugger::cleanup() {
	breakpoints.cleanup();
	exceptions.cleanup();
	
	OSMessage message;
	while (OSReceiveMessage(&eventQueue, &message, OS_MESSAGE_FLAGS_NONE));
}

void Debugger::mainLoop(Client *client) {
	while (true) {
		uint8_t cmd;
		if (!client->recvall(&cmd, 1)) return;
		
		if (cmd == COMMAND_CLOSE) return;
		else if (cmd == COMMAND_READ) {
			uint32_t addr, length;
			if (!client->recvall(&addr, 4)) return;
			if (!client->recvall(&length, 4)) return;
			
			char *buffer = new char[length];
			breakpoints.read(buffer, addr, length);
			if (!client->sendall(buffer, length)) {
				delete buffer;
				return;
			}
			delete buffer;
		}
		else if (cmd == COMMAND_WRITE) {
			uint32_t addr, length;
			if (!client->recvall(&addr, 4)) return;
			if (!client->recvall(&length, 4)) return;
			if (!client->recvall((void *)addr, length)) return;
		}
		else if (cmd == COMMAND_WRITE_CODE) {
			uint32_t addr, length;
			if (!client->recvall(&addr, 4)) return;
			if (!client->recvall(&length, 4)) return;
			
			char *buffer = new char[length];
			if (!client->recvall(buffer, length)) {
				delete buffer;
				return;
			}
			breakpoints.write(buffer, addr, length);
			delete buffer;
		}
		else if (cmd == COMMAND_GET_MODULE_NAME) {
			char name[0x40];
			int length = 0x40;
			OSDynLoad_GetModuleName(-1, name, &length);
			
			length = strlen(name);
			if (!client->sendall(&length, 4)) return;
			if (!client->sendall(name, length)) return;
		}
		else if (cmd == COMMAND_GET_MODULE_LIST) {
			OSLockMutex(OSDynLoad_gLoaderLock);
			
			char buffer[0x1000]; //This should be enough
			uint32_t offset = 0;
			OSDynLoad_RPLInfo *current = FirstRPL;
			while (current) {
				OSDynLoad_NotifyData *info = current->notifyData;
				
				uint32_t namelen = strlen(current->name);
				if (offset + 0x18 + namelen > 0x1000) {
					break;
				}
				
				uint32_t *infobuf = (uint32_t *)(buffer + offset);
				infobuf[0] = info->textAddr;
				infobuf[1] = info->textSize;
				infobuf[2] = info->dataAddr;
				infobuf[3] = info->dataSize;
				infobuf[4] = (uint32_t)current->entryPoint;
				infobuf[5] = namelen;
				memcpy(&infobuf[6], current->name, namelen);
				offset += 0x18 + namelen;
				
				current = current->next;
			}
			
			OSUnlockMutex(OSDynLoad_gLoaderLock);
			
			if (!client->sendall(&offset, 4)) return;
			if (!client->sendall(buffer, offset)) return;
		}
		else if (cmd == COMMAND_GET_THREAD_LIST) {
			int state = OSDisableInterrupts();
			__OSLockScheduler(this);
			
			char buffer[0x1000]; //This should be enough
			uint32_t offset = 0;
			OSThread *current = ThreadList;
			while (current) {
				const char *name = OSGetThreadName(current);
				
				uint32_t namelen = 0;
				if (name) {
					namelen = strlen(name);
				}

				if (offset + 0x1C + namelen > 0x1000) {
					break;
				}
				
				int priority = current->basePriority;
				if (current->type == 1) {
					priority -= 0x20;
				}
				else if (current->type == 2) {
					priority -= 0x40;
				}
				
				uint32_t *infobuf = (uint32_t *)(buffer + offset);
				infobuf[0] = (uint32_t)current;
				infobuf[1] = current->attr & 7;
				infobuf[2] = priority;
				infobuf[3] = (uint32_t)current->stackBase;
				infobuf[4] = (uint32_t)current->stackEnd;
				infobuf[5] = (uint32_t)current->entryPoint;
				infobuf[6] = namelen;
				memcpy(&infobuf[7], name, namelen);
				offset += 0x1C + namelen;
				
				current = current->activeLink.next;
			}
			
			__OSUnlockScheduler(this);
			OSRestoreInterrupts(state);
			
			if (!client->sendall(&offset, 4)) return;
			if (!client->sendall(buffer, offset)) return;
		}
		else if (cmd == COMMAND_GET_STACK_TRACE) {
			OSThread *thread;
			if (!client->recvall(&thread, 4)) return;
			
			ExceptionState *state = exceptions.find(thread);
			if (state) {
				uint32_t sp = state->context.gpr[1];
				uint32_t trace[100];
				int index = 0;
				while (checkDataRead(sp, 4) && index < 100) {
					sp = *(uint32_t *)sp;
					if (!checkDataRead(sp, 4)) break;
						
					trace[index] = *(uint32_t *)(sp + 4);
					index++;
				}
				
				if (!client->sendall(&index, 4)) return;
				if (!client->sendall(trace, index * 4)) return;
			}
			else {
				int index = 0;
				if (!client->sendall(&index, 4)) return;
			}
		}
		else if (cmd == COMMAND_TOGGLE_BREAKPOINT) {
			uint32_t address;
			if (!client->recvall(&address, 4)) return;
			
			breakpoints.toggle(address);
		}
		else if (cmd == COMMAND_POKE_REGISTERS) {
			OSThread *thread;
			if (!client->recvall(&thread, 4)) return;
			
			uint32_t gpr[32];
			double fpr[32];
			if (!client->recvall(gpr, 4 * 32)) return;
			if (!client->recvall(fpr, 8 * 32)) return;
			
			exceptions.lock();
			ExceptionState *state = exceptions.find(thread);
			if (state) {
				memcpy(state->context.gpr, gpr, 4 * 32);
				memcpy(state->context.fpr, fpr, 8 * 32);
			}
			exceptions.unlock();
		}
		else if (cmd == COMMAND_RECEIVE_MESSAGES) {
			OSMessage messages[10];
			
			int count = 0;
			while (count < 10) {
				if (!OSReceiveMessage(&eventQueue, &messages[count], OS_MESSAGE_FLAGS_NONE)) {
					break;
				}
				count++;
			}
			
			if (!client->sendall(&count, 4)) return;
			for (int i = 0; i < count; i++) {
				if (!client->sendall(&messages[i], sizeof(OSMessage))) return;
				if (messages[i].args[0]) {
					void *data = (void *)messages[i].args[0];
					size_t length = messages[i].args[1];
					if (!client->sendall(data, length)) return;
				}
			}
		}
		else if (cmd == COMMAND_SEND_MESSAGE) {
			OSMessage message;
			if (!client->recvall(&message, sizeof(OSMessage))) return;
			
			OSThread *thread = (OSThread *)message.args[0];
			
			exceptions.lock();
			ExceptionState *state = exceptions.find(thread);
			if (state) {
				OSSendMessage(&state->queue, &message, OS_MESSAGE_FLAGS_NONE);
			}
			exceptions.unlock();
		}
	}
}

void Debugger::threadFunc() {
	int result = socket_lib_init();
	if (result < 0) {
		OSFatal("Failed to initialize socket library");
	}
	
	OSSetExceptionCallbackEx(OS_EXCEPTION_MODE_GLOBAL_ALL_CORES, OS_EXCEPTION_TYPE_DSI, dsiHandler);
	OSSetExceptionCallbackEx(OS_EXCEPTION_MODE_GLOBAL_ALL_CORES, OS_EXCEPTION_TYPE_ISI, isiHandler);
	OSSetExceptionCallbackEx(OS_EXCEPTION_MODE_GLOBAL_ALL_CORES, OS_EXCEPTION_TYPE_PROGRAM, programHandler);
	
	Server server;
	Client client;
	
	initialized = true;
	while (true) {
		if (!server.init(Socket::TCP)) continue;
		if (!server.bind(1560)) continue;
		if (!server.accept(&client)) continue;
		connected = true;
		mainLoop(&client);
		cleanup();
		connected = false;
		client.close();
		server.close();
	}
}

int Debugger::threadEntry(int argc, void *argv) {
	debugger->threadFunc();
	return 0;
}

void Debugger::start() {
	initialized = false;
	connected = false;
	firstTrap = true;
	
	OSInitMessageQueue(&eventQueue, eventMessages, MESSAGE_COUNT);
	
	breakpoints.init();
	exceptions.init();
	stepper.init();
	
	serverThread = new OSThread();	
	char *stack = new char[0x8000];

	OSCreateThread(
		serverThread, threadEntry, 0, 0,
		stack + STACK_SIZE, STACK_SIZE,
		0, 12
	);
	OSSetThreadName(serverThread, "Debug Server");
	OSResumeThread(serverThread);
	
	while (!initialized) {
		OSSleepTicks(OSMillisecondsToTicks(20));
	}
}

Debugger *debugger;