#define EFAULT 14

static int unsafe_put_user(int *value, int *ptr)
{
	asm goto ("1: movl %[value], %[mem]\n\t"
		  ".pushsection __ex_table\n\t"
		  ".long 1b - .\n\t"
		  ".long err - .\n\t"
		  ".popsection"
		  :: [value] "rmi" (*value), [mem] "m" (*ptr)
		  :: err );
	return 0;

err:
	return -EFAULT;
}

int test(int *user_a, int *user_b, int *user_c, int *user_d)
{
	int a = 1, b = 2, c = 3, d = 4;

	if (unsafe_put_user(&a, user_a))
		goto error;
	if (unsafe_put_user(&b, user_b))
		goto error;
	if (unsafe_put_user(&c, user_c))
		goto error;
	if (unsafe_put_user(&d, user_d))
		goto error;

	return 0;
	
error:
	return -EFAULT;
}