==== 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                  0x23b30bb2320  P readable   P unreadable
mmap xz                0x23b54aa4000  P unreadable P unreadable
mmap x                 0x23b68931000  P readable   P readable  
mmap nrx               0x23bb03a3000  P readable   P readable  
mmap nwx               0x23b556bb000  P readable   P readable  
mmap xnwx              0x23b667d8000  P readable   P readable  
main                   0x238b24fe420  P readable   P unreadable
libc                   0x23ba59db750  P readable   P unreadable