monitor.cpp - emulators/yapesdl - Rivoreo Source Code Repositories

 #include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <cstring>
 #include <vector>
 #include <string>
 #include "cpu.h"
 #include "monitor.h"

 using namespace std;

 #define COLS 80
 #define ROWS 20

 static struct {
 	char Str[128];
 	unsigned int Code;
 	char desc[128];
 } monCmds[] = {
 	{ "<dummy>", 0, "Dummy" },
 	//	{ "b [<address>]", MON_CMD_BREAKPOINT, "List all or set breakpoint to <address>.") },
 	{ "> [<address>] [<arg1>] [<arg2>] .. [<arg#>]", MON_CMD_CHANGEMEM, "Show/change memory from <address>." },
 	{ "d [<address>]", MON_CMD_DISASS, "Disassemble (from <address>)." },
 	{ "f <src_from> <src_to> <value>", MON_CMD_FILLMEM, "Fill memory range with <value>." },
 	{ "g [<address>]", MON_CMD_GO, "Go (to [<address>])." },
 	{ "m [<address>]", MON_CMD_MEM, "Memory dump (from [<address>])." },
 	{ "t <src_from> <src_to> <target>", MON_CMD_TRANSFER, "Memory copy transfer (from start address)." },
 	{ "x", MON_CMD_EXIT, "Exit monitor." },
 	{ "z", MON_CMD_STEP, "Debug" },
 	//{ "attach <filename>", MON_CMD_ATTACHIMAGE, "Attach image." },
 	//{ "detach", MON_CMD_DETACHIMAGE, "Detach current image." },
 	//	{ "loadbin <filename>", MON_CMD_LOADBIN, "Load binary file.") },
 	//	{ "loadrom [<filename>]", MON_CMD_LOADROM, "Load as ROM or restore default one.") },
 	//	{ "loadcharset [<filename>]", MON_CMD_LOADCHARSET, "Load charset or restore default one.") },
 	{ "reg", MON_CMD_REGS, "Register dump." },
 	{ "reset", MON_CMD_RESET, "Machine soft reset." },
 	//{ "restart", MON_CMD_RESTART, "Machine restart." },
 	//{ "savebin <filename> <from> <to>", MON_CMD_SAVEBIN, "Save binary file from address." },
 	//	{ "rmb [<address>]", MON_CMD_REMOVEBREAKPOINT, "Remove breakpoint(s) from <address> or all.") },
 	{ "sys <command>", MON_CMD_SYS, "Do OS <command>." },
 	//	{ "w <address>", MON_CMD_WATCHPOINT, "Watchpoint to <address>.") },
 	{ "?", MON_CMD_HELP, "Help" }
 };

 #define NR_OF_MON_CMDS (sizeof(monCmds)/sizeof(monCmds[0]))

 static CPU *cpuptr;
 static int disAssPc, memDumpPc;
 static unsigned int command;

 inline static char** new2d(int rows, int cols)
 {
 	char* data = new char [rows * cols];
 	char** rowpointers = new char *[rows * sizeof(*rowpointers)];
 	int i;
 	if (data == NULL || rowpointers == NULL)
 		return NULL;
 	rowpointers[0] = data;
 	for (i = 1; i < rows; ++i) {
 		rowpointers[i] = rowpointers[i-1] + cols;
 	}
 	return rowpointers;
 }

 inline static void free2d(char** rowpointers)
 {
 	if (rowpointers == NULL)
 		return;
 	delete rowpointers[0];
 	delete rowpointers;
 	rowpointers = NULL;
 }

 char cbmToASCII(unsigned char c)
 {
 	if (c >= 0x00 && c <= 0x1A)
 		return c ^ 0x40;
 	if (c >= 0x1b && c < 0x20)
 		return '_';
 	if (c == 0x25)
 		return '/';
 	if (c >= 0x41 && c <= 0x5A)
 		return c ^ 0x20;
 	if ((c >= 0xc1) && (c <= 0xda))
 		return c ^ 0x80;

 	return (char) c;
 }

 int xtoi(const char *str)
 {
 	size_t ln = strlen(str);
 	unsigned int i = 1;
 	unsigned int s = 0;

 	while (ln--) {
 		char c = tolower(str[ln]);
 		if (c >= 'a' && c <= 'f') {
 			s += (c - 'a' + 10) * i;
 		} else if (c >= '0' && c <= '9') {
 			s += (c - '0') * i;
 		}
 		i *= 16;
 	}
 	return s;
 }

 static void getFirstString(char *from, char *to)
 {
 	char *begin = from;

 	while (begin && begin[0] == ' ') begin++;
 	strcpy(to, begin);

 	char *end = strpbrk(to, " \r\n");
 	if (end) {
 		*end = 0;
 	}
 }

 static void showHelp()
 {
 	for(unsigned int i=1; i<NR_OF_MON_CMDS; i++) {
 		printf("%s : %s\n", monCmds[i].Str, monCmds[i].desc);
 	}
 }

 static void parseCommand(char *line, unsigned int &cmdCode)
 {
 	unsigned int i;

 	// Strip spaces
 	while (*line == ' ')
 		line++;

 	char commandString[256];
 	memset(commandString, 0, sizeof(commandString));
 	getFirstString(line, commandString);
 	cmdCode = MON_CMD_NONE;
 	if (0 == strlen(commandString))
 		return;

 	for(i=1; i<NR_OF_MON_CMDS; i++) {
 		if ( !strncmp(commandString, monCmds[i].Str, strlen(commandString)) ) { // CompareString
 			cmdCode = monCmds[i].Code;
 			break;
 		}
 	}
 }

 //static int parseArgs(char *line, char args[4][256])
 //{
 //	char *param;
 //	int argCount = 0;
 //
 //	// Strip spaces
 //	while (*line == ' ')
 //		line++;
 //	argCount = 0;
 //	param = strchr(line, ' ');
 //	while (param && param[1] && argCount<4) {
 //		line = param + 1;
 //		sscanf(line, "%s", args[argCount]);
 //		param = strchr(line, ' ');
 //		argCount += 1;
 //	}
 //	return argCount;
 //}

 static void memShow(int pc, int dumpwidth)
 {
 	unsigned short current_pc;
 	int i;
 	unsigned int rowcount, rows, cols;
 	char temp[256];
 	char line[256];
 	char **linebuffer;
 	MemoryHandler &mem = cpuptr->getMem();

 	//con->getDimensions(cols, rows);
 	cols = COLS;
 	rows = ROWS;

 	linebuffer = new2d(rows,cols);
 	if (memDumpPc == 0)
 		memDumpPc = pc;

 	current_pc = memDumpPc;
 	rowcount = 0;
 	while ( rowcount < rows ) {
 		sprintf( line, " %04X: ", current_pc );
 		for  ( i = 0; i<dumpwidth/2; i++) {
 			if ((i&0xF)==8) strcat( line, " ");
 			sprintf( temp, "%02X ", mem.Read(current_pc+i) & 0xFF);
 			strcat( line, temp);
 		}
 		strcat( line, ":");
 		for  ( i = 0; i<dumpwidth/2; i++) {
 			unsigned char a = mem.Read(current_pc+i);
 			if (!(a & 0x80))
 				sprintf(temp, "%c", cbmToASCII(a));
 			else
 				sprintf(temp, ".");
 			strcat( line, temp);
 		}
 		strcat( line, "\n");
 		printf("%s", line);
 		strcpy( line, "\0");
 		current_pc += dumpwidth/2;
 		rowcount++;
 	}
 	memDumpPc = current_pc;

 	free2d(linebuffer);
 }

 static void dumpRegs()
 {
 	char line[256];

 	cpuptr->regDump(line,0);
 	printf("%s", line);
 	cpuptr->regDump(line,1);
 	printf("%s", line);
 }

 static void memDump()
 {
 	int dumpwidth = ((COLS - 16) / 2) & 0xF8;
 	memShow(memDumpPc,dumpwidth);
 }

 static void memChange(vector<string> args)
 {
 	unsigned int argCount = (unsigned int) args.size();
 	if (argCount--) {
 		memDumpPc = xtoi(args[0].c_str()) & 0xffff;
 	} else {
 		memDump();
 		return;
 	}
 	while (argCount--) {
 		unsigned char a = xtoi(args[argCount + 1].c_str()) & 0xff;
 		cpuptr->getMem().Write(memDumpPc + argCount, a);
 	}
 }

 static void step()
 {
 	char line[256];
 	unsigned short current_pc = cpuptr->getPC();

 	disAssPc = cpuptr->disassemble(current_pc, line);
 	printf("%s", line);
 	cpuptr->step();
 	dumpRegs();
 }

 static void dumpDisAss(int pc)
 {
 	unsigned short current_pc;
 	unsigned int rows, cols, rowcount;
 	char **linebuffer;

 	//con->getDimensions(cols, rows);
 	cols = COLS;
 	rows = ROWS;

 	if (rows+cols == 0)
 		return;

 	linebuffer = new2d(rows,cols);
 	if (disAssPc == 0)
 		disAssPc = pc;

 	current_pc = disAssPc;
 	rowcount = 2;
 	while ( rowcount < rows ) {
 		current_pc = cpuptr->disassemble(current_pc, linebuffer[rowcount]);
 		//con->outDisassString(rowcount,linebuffer[rowcount++]);
 		printf("%s", linebuffer[rowcount++]);
 	}
 	disAssPc = current_pc;

 	free2d(linebuffer);
 }

 static void disAss(int dir)
 {
 	if (dir == 0) {
 		dumpDisAss(cpuptr->getPC());
 	} else {
 		dumpDisAss(disAssPc);
 	}
 }

 void executeCmd(unsigned int cmd, vector<string> &args, char *wholeLine)
 {
 	vector<unsigned int> argval;
 	unsigned int argCount = (unsigned int) args.size();
 	unsigned int r = 0;

 	while (r < argCount) {
 		argval.push_back(xtoi(args[r].c_str()));
 		r++;
 	}

 	switch (cmd) {

 		case 0:
 			// empty line
 			break;

 		case MON_CMD_MEM:
 			if (argCount >= 1) {
 				memDumpPc = argval[0];
 			}
 			memDump();
 			break;

 		case MON_CMD_CHANGEMEM:
 			memChange(args);
 			break;

 		case MON_CMD_FILLMEM:
 			if (argCount == 3) {
 				while (argval[0] <= argval[1]) {
 					cpuptr->getMem().Write(argval[0]++, argval[2]);
 				}
 			}
 			break;

 		case MON_CMD_TRANSFER:
 			if (argCount == 3) {
 				while (argval[0] <= argval[1]) {
 					int readval = cpuptr->getMem().Read(argval[0]++);
 					cpuptr->getMem().Write(argval[2]++, readval);
 				}
 			}
 			break;

 		case MON_CMD_DISASS:
 			if (argCount >= 1) {
 				disAssPc = argval[0];
 			}
 			disAss(+1);
 			break;

 		case MON_CMD_STEP:
 			step();
 			break;

 		case MON_CMD_REGS:
 			dumpRegs();
 			break;

 		case MON_CMD_GO:
 			if (argCount >= 1) {
 				cpuptr->setPC(argval[0]);
 			}
 			command = MON_CMD_EXIT;
 			break;

 		//case MON_CMD_ATTACHIMAGE:
 		//	if (argCount >= 1) {
 		//		theMachine->attachTape(args[0]);
 		//	}
 		//	break;

 		//case MON_CMD_DETACHIMAGE:
 		//	theMachine->detachTape();
 		//	break;

 		case MON_CMD_RESET:
 			cpuptr->Reset();
 			printf("Machine soft reset.\n");
 			break;

 		//case MON_CMD_RESTART:
 		//	theMachine->coldRestart();
 		//	printf("Machine restart.\n");
 		//	break;

 		case MON_CMD_LOADBIN:
 			if (argCount >= 2) {
 				//cpuptr->loadBinFromFile(args[0], argval[1]);
 			}
 			break;

 		case MON_CMD_SAVEBIN:
 			if (argCount >= 3) {
 				//cpuptr->saveToFile(args[0], argval[1], argval[2]);
 			}
 			break;

 		case MON_CMD_SYS:
 			if (argCount >= 1) {
 				wholeLine = strchr(wholeLine, ' ');
 				if (wholeLine) {
 					wholeLine++;
 					system(wholeLine);
 				}
 			}
 			break;

 		case MON_CMD_HELP:
 			showHelp();
 			break;

 		case MON_CMD_EXIT:
 			printf("Exiting the monitor...\n");
 			break;

 		default:
 			printf("Unknown command code: %i.\n", cmd);
 			break;
 	}
 }

 static void parseLine(char *line, unsigned int &cmdCode)
 {
 	vector<string> args;
 	const char *dl = " ,.-\n\r\t";

 	parseCommand(line, cmdCode);
 	// first token is command string
 	char *carg = strtok(line, dl);
 	carg = strtok(NULL, dl);
 	//
 	while (carg) {
 		args.push_back(carg);
 		carg = strtok(NULL, dl);
 	}
 	executeCmd(cmdCode, args, line);
 }

 void monitorEnter(CPU *cpu)
 {
 	char buffer[256];

 	cpuptr = cpu;
 	disAssPc = memDumpPc = cpuptr->getPC();

 	printf("Welcome to the monitor!\n");
 	printf("Type ? for help!\n");

 	do {
 		command = MON_CMD_NONE;
 		strcpy(buffer, "");
 		fgets(buffer, 256, stdin);
 		parseLine(buffer, command);
 	} while (command != MON_CMD_EXIT);
 }
	#include <ctype.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <cstring>
	#include <vector>
	#include <string>
	#include "cpu.h"
	#include "monitor.h"

	using namespace std;

	#define COLS 80
	#define ROWS 20

	static struct {
	char Str[128];
	unsigned int Code;
	char desc[128];
	} monCmds[] = {
	{ "<dummy>", 0, "Dummy" },
	// { "b [<address>]", MON_CMD_BREAKPOINT, "List all or set breakpoint to <address>.") },
	{ "> [<address>] [<arg1>] [<arg2>] .. [<arg#>]", MON_CMD_CHANGEMEM, "Show/change memory from <address>." },
	{ "d [<address>]", MON_CMD_DISASS, "Disassemble (from <address>)." },
	{ "f <src_from> <src_to> <value>", MON_CMD_FILLMEM, "Fill memory range with <value>." },
	{ "g [<address>]", MON_CMD_GO, "Go (to [<address>])." },
	{ "m [<address>]", MON_CMD_MEM, "Memory dump (from [<address>])." },
	{ "t <src_from> <src_to> <target>", MON_CMD_TRANSFER, "Memory copy transfer (from start address)." },
	{ "x", MON_CMD_EXIT, "Exit monitor." },
	{ "z", MON_CMD_STEP, "Debug" },
	//{ "attach <filename>", MON_CMD_ATTACHIMAGE, "Attach image." },
	//{ "detach", MON_CMD_DETACHIMAGE, "Detach current image." },
	// { "loadbin <filename>", MON_CMD_LOADBIN, "Load binary file.") },
	// { "loadrom [<filename>]", MON_CMD_LOADROM, "Load as ROM or restore default one.") },
	// { "loadcharset [<filename>]", MON_CMD_LOADCHARSET, "Load charset or restore default one.") },
	{ "reg", MON_CMD_REGS, "Register dump." },
	{ "reset", MON_CMD_RESET, "Machine soft reset." },
	//{ "restart", MON_CMD_RESTART, "Machine restart." },
	//{ "savebin <filename> <from> <to>", MON_CMD_SAVEBIN, "Save binary file from address." },
	// { "rmb [<address>]", MON_CMD_REMOVEBREAKPOINT, "Remove breakpoint(s) from <address> or all.") },
	{ "sys <command>", MON_CMD_SYS, "Do OS <command>." },
	// { "w <address>", MON_CMD_WATCHPOINT, "Watchpoint to <address>.") },
	{ "?", MON_CMD_HELP, "Help" }
	};

	#define NR_OF_MON_CMDS (sizeof(monCmds)/sizeof(monCmds[0]))

	static CPU *cpuptr;
	static int disAssPc, memDumpPc;
	static unsigned int command;

	inline static char** new2d(int rows, int cols)
	{
	char* data = new char [rows * cols];
	char** rowpointers = new char [rows sizeof(*rowpointers)];
	int i;
	if (data == NULL \|\| rowpointers == NULL)
	return NULL;
	rowpointers[0] = data;
	for (i = 1; i < rows; ++i) {
	rowpointers[i] = rowpointers[i-1] + cols;
	}
	return rowpointers;
	}

	inline static void free2d(char** rowpointers)
	{
	if (rowpointers == NULL)
	return;
	delete rowpointers[0];
	delete rowpointers;
	rowpointers = NULL;
	}

	char cbmToASCII(unsigned char c)
	{
	if (c >= 0x00 && c <= 0x1A)
	return c ^ 0x40;
	if (c >= 0x1b && c < 0x20)
	return '_';
	if (c == 0x25)
	return '/';
	if (c >= 0x41 && c <= 0x5A)
	return c ^ 0x20;
	if ((c >= 0xc1) && (c <= 0xda))
	return c ^ 0x80;

	return (char) c;
	}

	int xtoi(const char *str)
	{
	size_t ln = strlen(str);
	unsigned int i = 1;
	unsigned int s = 0;

	while (ln--) {
	char c = tolower(str[ln]);
	if (c >= 'a' && c <= 'f') {
	s += (c - 'a' + 10) * i;
	} else if (c >= '0' && c <= '9') {
	s += (c - '0') * i;
	}
	i *= 16;
	}
	return s;
	}

	static void getFirstString(char from, char to)
	{
	char *begin = from;

	while (begin && begin[0] == ' ') begin++;
	strcpy(to, begin);

	char *end = strpbrk(to, " \r\n");
	if (end) {
	*end = 0;
	}
	}

	static void showHelp()
	{
	for(unsigned int i=1; i<NR_OF_MON_CMDS; i++) {
	printf("%s : %s\n", monCmds[i].Str, monCmds[i].desc);
	}
	}

	static void parseCommand(char *line, unsigned int &cmdCode)
	{
	unsigned int i;

	// Strip spaces
	while (*line == ' ')
	line++;

	char commandString[256];
	memset(commandString, 0, sizeof(commandString));
	getFirstString(line, commandString);
	cmdCode = MON_CMD_NONE;
	if (0 == strlen(commandString))
	return;

	for(i=1; i<NR_OF_MON_CMDS; i++) {
	if ( !strncmp(commandString, monCmds[i].Str, strlen(commandString)) ) { // CompareString
	cmdCode = monCmds[i].Code;
	break;
	}
	}
	}

	//static int parseArgs(char *line, char args[4][256])
	//{
	// char *param;
	// int argCount = 0;
	//
	// // Strip spaces
	// while (*line == ' ')
	// line++;
	// argCount = 0;
	// param = strchr(line, ' ');
	// while (param && param[1] && argCount<4) {
	// line = param + 1;
	// sscanf(line, "%s", args[argCount]);
	// param = strchr(line, ' ');
	// argCount += 1;
	// }
	// return argCount;
	//}

	static void memShow(int pc, int dumpwidth)
	{
	unsigned short current_pc;
	int i;
	unsigned int rowcount, rows, cols;
	char temp[256];
	char line[256];
	char **linebuffer;
	MemoryHandler &mem = cpuptr->getMem();

	//con->getDimensions(cols, rows);
	cols = COLS;
	rows = ROWS;

	linebuffer = new2d(rows,cols);
	if (memDumpPc == 0)
	memDumpPc = pc;

	current_pc = memDumpPc;
	rowcount = 0;
	while ( rowcount < rows ) {
	sprintf( line, " %04X: ", current_pc );
	for ( i = 0; i<dumpwidth/2; i++) {
	if ((i&0xF)==8) strcat( line, " ");
	sprintf( temp, "%02X ", mem.Read(current_pc+i) & 0xFF);
	strcat( line, temp);
	}
	strcat( line, ":");
	for ( i = 0; i<dumpwidth/2; i++) {
	unsigned char a = mem.Read(current_pc+i);
	if (!(a & 0x80))
	sprintf(temp, "%c", cbmToASCII(a));
	else
	sprintf(temp, ".");
	strcat( line, temp);
	}
	strcat( line, "\n");
	printf("%s", line);
	strcpy( line, "\0");
	current_pc += dumpwidth/2;
	rowcount++;
	}
	memDumpPc = current_pc;

	free2d(linebuffer);
	}

	static void dumpRegs()
	{
	char line[256];

	cpuptr->regDump(line,0);
	printf("%s", line);
	cpuptr->regDump(line,1);
	printf("%s", line);
	}

	static void memDump()
	{
	int dumpwidth = ((COLS - 16) / 2) & 0xF8;
	memShow(memDumpPc,dumpwidth);
	}

	static void memChange(vector<string> args)
	{
	unsigned int argCount = (unsigned int) args.size();
	if (argCount--) {
	memDumpPc = xtoi(args[0].c_str()) & 0xffff;
	} else {
	memDump();
	return;
	}
	while (argCount--) {
	unsigned char a = xtoi(args[argCount + 1].c_str()) & 0xff;
	cpuptr->getMem().Write(memDumpPc + argCount, a);
	}
	}

	static void step()
	{
	char line[256];
	unsigned short current_pc = cpuptr->getPC();

	disAssPc = cpuptr->disassemble(current_pc, line);
	printf("%s", line);
	cpuptr->step();
	dumpRegs();
	}

	static void dumpDisAss(int pc)
	{
	unsigned short current_pc;
	unsigned int rows, cols, rowcount;
	char **linebuffer;

	//con->getDimensions(cols, rows);
	cols = COLS;
	rows = ROWS;

	if (rows+cols == 0)
	return;

	linebuffer = new2d(rows,cols);
	if (disAssPc == 0)
	disAssPc = pc;

	current_pc = disAssPc;
	rowcount = 2;
	while ( rowcount < rows ) {
	current_pc = cpuptr->disassemble(current_pc, linebuffer[rowcount]);
	//con->outDisassString(rowcount,linebuffer[rowcount++]);
	printf("%s", linebuffer[rowcount++]);
	}
	disAssPc = current_pc;

	free2d(linebuffer);
	}

	static void disAss(int dir)
	{
	if (dir == 0) {
	dumpDisAss(cpuptr->getPC());
	} else {
	dumpDisAss(disAssPc);
	}
	}

	void executeCmd(unsigned int cmd, vector<string> &args, char *wholeLine)
	{
	vector<unsigned int> argval;
	unsigned int argCount = (unsigned int) args.size();
	unsigned int r = 0;

	while (r < argCount) {
	argval.push_back(xtoi(args[r].c_str()));
	r++;
	}

	switch (cmd) {

	case 0:
	// empty line
	break;

	case MON_CMD_MEM:
	if (argCount >= 1) {
	memDumpPc = argval[0];
	}
	memDump();
	break;

	case MON_CMD_CHANGEMEM:
	memChange(args);
	break;

	case MON_CMD_FILLMEM:
	if (argCount == 3) {
	while (argval[0] <= argval[1]) {
	cpuptr->getMem().Write(argval[0]++, argval[2]);
	}
	}
	break;

	case MON_CMD_TRANSFER:
	if (argCount == 3) {
	while (argval[0] <= argval[1]) {
	int readval = cpuptr->getMem().Read(argval[0]++);
	cpuptr->getMem().Write(argval[2]++, readval);
	}
	}
	break;

	case MON_CMD_DISASS:
	if (argCount >= 1) {
	disAssPc = argval[0];
	}
	disAss(+1);
	break;

	case MON_CMD_STEP:
	step();
	break;

	case MON_CMD_REGS:
	dumpRegs();
	break;

	case MON_CMD_GO:
	if (argCount >= 1) {
	cpuptr->setPC(argval[0]);
	}
	command = MON_CMD_EXIT;
	break;

	//case MON_CMD_ATTACHIMAGE:
	// if (argCount >= 1) {
	// theMachine->attachTape(args[0]);
	// }
	// break;

	//case MON_CMD_DETACHIMAGE:
	// theMachine->detachTape();
	// break;

	case MON_CMD_RESET:
	cpuptr->Reset();
	printf("Machine soft reset.\n");
	break;

	//case MON_CMD_RESTART:
	// theMachine->coldRestart();
	// printf("Machine restart.\n");
	// break;

	case MON_CMD_LOADBIN:
	if (argCount >= 2) {
	//cpuptr->loadBinFromFile(args[0], argval[1]);
	}
	break;

	case MON_CMD_SAVEBIN:
	if (argCount >= 3) {
	//cpuptr->saveToFile(args[0], argval[1], argval[2]);
	}
	break;

	case MON_CMD_SYS:
	if (argCount >= 1) {
	wholeLine = strchr(wholeLine, ' ');
	if (wholeLine) {
	wholeLine++;
	system(wholeLine);
	}
	}
	break;

	case MON_CMD_HELP:
	showHelp();
	break;

	case MON_CMD_EXIT:
	printf("Exiting the monitor...\n");
	break;

	default:
	printf("Unknown command code: %i.\n", cmd);
	break;
	}
	}

	static void parseLine(char *line, unsigned int &cmdCode)
	{
	vector<string> args;
	const char *dl = " ,.-\n\r\t";

	parseCommand(line, cmdCode);
	// first token is command string
	char *carg = strtok(line, dl);
	carg = strtok(NULL, dl);
	//
	while (carg) {
	args.push_back(carg);
	carg = strtok(NULL, dl);
	}
	executeCmd(cmdCode, args, line);
	}

	void monitorEnter(CPU *cpu)
	{
	char buffer[256];

	cpuptr = cpu;
	disAssPc = memDumpPc = cpuptr->getPC();

	printf("Welcome to the monitor!\n");
	printf("Type ? for help!\n");

	do {
	command = MON_CMD_NONE;
	strcpy(buffer, "");
	fgets(buffer, 256, stdin);
	parseLine(buffer, command);
	} while (command != MON_CMD_EXIT);
	}