==== run-regress-xonly ====
cc -O2 -pipe  -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                  0x7fb165d4260  P readable   P unreadable
mmap xz                0x7faffe2f000  P unreadable P unreadable
mmap x                 0x7fa7f5da000  P readable   P readable  
mmap nrx               0x7fad65a8000  P readable   P readable  
mmap nwx               0x7fb1147b000  P readable   P readable  
mmap xnwx              0x7fa7ec0d000  P readable   P readable  
main                   0x7f86d4fc430  P readable   P unreadable
libc                   0x7fb6cec5470  P readable   P unreadable