==== 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                  0x498c9f28170  P readable   P unreadable
mmap xz                0x498daff2000  P unreadable P unreadable
mmap x                 0x498b900d000  P readable   P readable  
mmap nrx               0x498fcfe2000  P readable   P readable  
mmap nwx               0x498bc1b1000  P readable   P readable  
mmap xnwx              0x498e04aa000  P readable   P readable  
main                   0x4960625f420  P readable   P unreadable
libc                   0x498561eed00  P readable   P unreadable