==== 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                  0xbb33395c850  P readable   P unreadable
mmap xz                0xbb3188da000  P unreadable P unreadable
mmap x                 0xbb3081d1000  P readable   P readable  
mmap nrx               0xbb282bc2000  P readable   P readable  
mmap nwx               0xbb25d9a3000  P readable   P readable  
mmap xnwx              0xbb2f0955000  P readable   P readable  
main                   0xbb048cc9430  P readable   P unreadable
libc                   0xbb2719cda10  P readable   P unreadable