==== 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                  0xbe2e5584390  P readable   P unreadable
mmap xz                0xbe2a2b82000  P unreadable P unreadable
mmap x                 0xbe298102000  P readable   P readable  
mmap nrx               0xbe359af9000  P readable   P readable  
mmap nwx               0xbe2cb4d0000  P readable   P readable  
mmap xnwx              0xbe318b34000  P readable   P readable  
main                   0xbe0783d1420  P readable   P unreadable
libc                   0xbe2d95c5ca0  P readable   P unreadable