==== 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                  0xdab8fea5850  P readable   P unreadable
mmap xz                0xdac3b292000  P unreadable P unreadable
mmap x                 0xdab97a48000  P readable   P readable  
mmap nrx               0xdab4e237000  P readable   P readable  
mmap nwx               0xdab966e4000  P readable   P readable  
mmap xnwx              0xdab85150000  P readable   P readable  
main                   0xda94d13d410  P readable   P unreadable
libc                   0xdabb7c62e40  P readable   P unreadable