int main( int argc, char *argv[] ){
char *filename;
if ( argc != 2 ){
printf("Argc: %d\n", argc);
fprintf(stderr, "A file has not been supplied\n");
exit( 1 );
}
filename = argv[1];
load(filename); //load the contents of the file into memory
instructionCycle(); //this first function call represents the start of the
//fetch-execute cycle
return 0;
}
/**
Main menu
**/
void menu() {
int instrReturn;
char choice;
int bytesRead;
unsigned offset, length;
// initialize memory, declared in myMenu.h
char memory[MEMSIZE];
// initialize registers and reset, declared in myMenu.h
struct Registers myRegisters;
reset(&myRegisters);
while (1) {
// display menu
fprintf(stdout, "\n\n---------------------------------------------------");
fprintf(stdout, "\nSheranga Balasuriya: Welcome to my Virtual CPU\nPlease select one of the following");
fprintf(stdout, "\nd\tdump memory");
fprintf(stdout, "\ng\tgo");
fprintf(stdout, "\nl\tload a file into memory");
fprintf(stdout, "\nm\tmemory modify");
fprintf(stdout, "\nq\tquit");
fprintf(stdout, "\nr\tdisplay registers");
fprintf(stdout, "\nt\ttrace");
fprintf(stdout, "\nw\twrite file");
fprintf(stdout, "\nz\treset registers");
fprintf(stdout, "\nb\tenable/disable debugging");
fprintf(stdout, "\n? , h\tdisplay help\n");
fscanf(stdin, " %1c", &choice);
flush();
// check choice taken
switch (choice) {
case 'd':
case 'D':
// get offset from user
fprintf(stdout, "\nPleae enter the offset in hex: ");
fscanf(stdin, "%x", &offset);
flush();
// get length from user
fprintf(stdout, "\nPlease enter the length in hex: ");
fscanf(stdin, "%x", &length);
flush();
memDump(memory, offset, length);
break;
case 'g':
case 'G':
go(&myRegisters,memory);
break;
case 'l':
case 'L':
bytesRead = loadFile(memory, MEMSIZE);
if (bytesRead > 0)
fprintf(stdout, "\n%d(0x%X) bytes read into memory", bytesRead, bytesRead);
break;
case 'm':
case 'M':
modify(memory);
break;
case 'q':
case 'Q':
return;
break;
case 'r':
case 'R':
showRegisters(&myRegisters);
break;
case 't':
case 'T':
instrReturn = instructionCycle(&myRegisters, memory);
showRegisters(&myRegisters);
break;
case 'w':
case 'W':
writeFile(memory);
break;
case 'z':
case 'Z':
reset(&myRegisters);
break;
case 'b':
case 'B':
debug(&myRegisters);
break;
case '?':
case 'h':
case 'H':
help();
break;
default:
fprintf(stdout, "\nIncorrect entry, try again");
}
}
}
