NLVAR
printf("max kernelsize = %ld\n", NLVAR(X_MAXKERNEL_SIZE));
if (destlen > NLVAR(X_MAXKERNEL_SIZE))
NLVAR(X_KERNEL_SIZE) = destlen;
NLVAR(X_KERNEL_LOADADDR) = lowaddr;
NLVAR(X_KERNEL_ENTRY) = ehdr.e_entry;