==== 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                  0xa31f605d720  P readable   P unreadable
mmap xz                0xa329eb61000  P unreadable P unreadable
mmap x                 0xa3249ee7000  P readable   P readable  
mmap nrx               0xa31f2bdd000  P readable   P readable  
mmap nwx               0xa31f9874000  P readable   P readable  
mmap xnwx              0xa32214a1000  P readable   P readable  
main                   0xa2fd556d430  P readable   P unreadable
libc                   0xa3275573840  P readable   P unreadable