==== run-regress-xonly ====
cc -O2 -pipe  -g -Wall -Wpointer-arith -Wuninitialized -Wstrict-prototypes -Wmissing-prototypes -Wunused -Wsign-compare -Wshadow  -MD -MP  -c /home/src/regress/sys/kern/xonly/xonly.c
cc   -o xonly xonly.o 
./xonly
                                      userland     kernel
ld.so                  0xf98de5cb5f0  P readable   P unreadable
mmap xz                0xf99110b3000  P unreadable P unreadable
mmap x                 0xf9987132000  P readable   P readable  
mmap nrx               0xf990b1b7000  P readable   P readable  
mmap nwx               0xf993e060000  P readable   P readable  
mmap xnwx              0xf9938276000  P readable   P readable  
main                   0xf9692f45410  P readable   P unreadable
libc                   0xf98980bb6c0  P readable   P unreadable