==== 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                  0xc9c13dcd000  P readable   P unreadable
mmap xz                0xc9c7fbe3000  P unreadable P unreadable
mmap x                 0xc9caa6db000  P readable   P readable  
mmap nrx               0xc9bf7a1f000  P readable   P readable  
mmap nwx               0xc9c453f7000  P readable   P readable  
mmap xnwx              0xc9c3479b000  P readable   P readable  
main                   0xc99cf2b7420  P readable   P unreadable
libc                   0xc9bf6410300  P readable   P unreadable