static void
syscall_handler (struct intr_frame *f )
{
/* VALUE */
int syscall_num;
int arg[5];
void *esp = f->esp;
/* VALUE */
check_address(esp, f->esp);
syscall_num = *(int *)esp;
switch(syscall_num)
{
case SYS_HALT:
halt();
break;
case SYS_EXIT:
get_argument(esp,arg,1);
exit(arg[0]);
break;
case SYS_EXEC:
get_argument(esp,arg,1);
check_valid_string((const void *)arg[0], f->esp);
f->eax = exec((const char *)arg[0]);
break;
case SYS_WAIT:
get_argument(esp,arg,1);
f->eax = wait(arg[0]);
break;
case SYS_CREATE:
get_argument(esp,arg,2);
check_valid_string((const void *)arg[0], f->esp);
f->eax = create((const char *)arg[0],(unsigned)arg[1]);
break;
case SYS_REMOVE:
get_argument(esp,arg,1);
check_valid_string((const void *)arg[0], f->esp);
f->eax=remove((const char *)arg[0]);
break;
case SYS_OPEN:
get_argument(esp,arg,1);
check_valid_string((const void *)arg[0], f->esp);
f->eax = open((const char *)arg[0]);
break;
case SYS_FILESIZE:
get_argument(esp,arg,1);
f->eax = filesize(arg[0]);
break;
case SYS_READ:
get_argument(esp,arg,3);
check_valid_buffer((void *)arg[1], (unsigned)arg[2], f->esp, true);
f->eax = read(arg[0],(void *)arg[1],(unsigned)arg[2]);
break;
case SYS_WRITE:
get_argument(esp,arg,3);
check_valid_buffer((void *)arg[1], (unsigned)arg[2], f->esp, false);
f->eax = write(arg[0],(void *)arg[1],(unsigned)arg[2]);
break;
case SYS_SEEK:
get_argument(esp,arg,2);
seek(arg[0],(unsigned)arg[1]);
break;
case SYS_TELL:
get_argument(esp,arg,1);
f->eax = tell(arg[0]);
break;
case SYS_CLOSE:
get_argument(esp,arg,1);
close(arg[0]);
break;
case SYS_MMAP:
get_argument(esp,arg,2);
f->eax = mmap(arg[0],(void *)arg[1]);
break;
case SYS_MUNMAP:
get_argument(esp,arg,1);
munmap(arg[0]);
break;
}
}
static void//
syscall_handler (struct intr_frame *f)
{
int args[3];
// The f-esp is void *, stack memory location, so dereference at location to get value
switch (* (int *) f->esp)
{
case SYS_HALT:
{
halt();
break;
}
case SYS_EXIT:
{
//printf("exiting\n");
get_args(f, args, 1);
f->eax = args[0];
exit(args[0]);
break;
}
case SYS_EXEC:
{
f->eax = 10;
get_args(f, args, 1);
args[0] = user_to_kernel_pointer((const void *) args[0]);
f->eax = exec((const char *) args[0]);
break;
}
case SYS_WRITE:
{
//printf("writing file\n");
get_args(f, args, 3);
check_valid_buffer((void *) args[1], (unsigned) args[2]);
const void *test = user_to_kernel_pointer((const void *) args[1]);
f->eax = write(args[0], test, (unsigned) args[2]);
break;
}
case SYS_WAIT:
{
get_args(f, args, 1);
f->eax = wait(args[0]);
break;
}
case SYS_CREATE:
{
//printf("creating file\n");
get_args(f, args, 2);
args[0] = user_to_kernel_pointer((const void *) args[0]);
f->eax = create((const char *) args[0], (unsigned) args[1]);
break;
}
case SYS_REMOVE:
{
//printf("removing file\n");
get_args(f, args, 1);
args[0] = user_to_kernel_pointer((const void *) args[0]);
f->eax = remove((const char *) args[0]);
}
case SYS_OPEN:
{
//printf("opening file\n");
get_args(f, args, 1);
args[0] = user_to_kernel_pointer((const void *) args[0]);
f->eax = open((const char *) args[0]);
break;
}
case SYS_FILESIZE:
{
//printf("checking filesize\n");
get_args(f, args, 1);
f->eax = filesize(args[0]);
}
case SYS_READ:
{
//printf("reading file\n");
get_args(f, args, 3);
check_valid_buffer((void *) args[1], (unsigned) args[2]);
args[1] = user_to_kernel_pointer((const void *) args[1]);
f->eax = read(args[0], (void *) args[1], (unsigned) args[2]);
break;
}
case SYS_SEEK:
{
//printf("seeking file\n");
get_args(f, args, 2);
seek(args[0], (unsigned) args[1]);
break;
}
case SYS_TELL:
{
//printf("telling file\n");
get_args(f, args, 1);
seek(args[0], (unsigned) args[1]);
break;
}
case SYS_CLOSE:
{
//printf("closing file\n");
get_args(f, args, 1);
close(args[0]);
break;
}
}
}