==== 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                  0xb92ca262f90  P readable   P unreadable
mmap xz                0xb93362c9000  P unreadable P unreadable
mmap x                 0xb927eaa3000  P readable   P readable  
mmap nrx               0xb932cf08000  P readable   P readable  
mmap nwx               0xb928744f000  P readable   P readable  
mmap xnwx              0xb9288e11000  P readable   P readable  
main                   0xb905fdc3420  P readable   P unreadable
libc                   0xb929d1e9600  P readable   P unreadable