==== run-regress-xonly ====
cc -O2 -pipe  -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                  0x827171db000  P readable   P unreadable
mmap xz                0x82651940000  P unreadable P unreadable
mmap x                 0x82673a29000  P readable   P readable  
mmap nrx               0x826e645f000  P readable   P readable  
mmap nwx               0x8269ed54000  P readable   P readable  
mmap xnwx              0x82742fee000  P readable   P readable  
main                   0x8244e564430  P readable   P unreadable
libc                   0x826f1db2370  P readable   P unreadable