==== 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                  0xb1688449000  P readable   P unreadable
mmap xz                0xb16a6d1d000  P unreadable P unreadable
mmap x                 0xb16bd33c000  P readable   P readable  
mmap nrx               0xb161cdd4000  P readable   P readable  
mmap nwx               0xb16708c7000  P readable   P readable  
mmap xnwx              0xb16974c6000  P readable   P readable  
main                   0xb1400905420  P readable   P unreadable
libc                   0xb16b322e140  P readable   P unreadable