==== 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                  0xde3a323f870  P readable   P unreadable
mmap xz                0xde37db76000  P unreadable P unreadable
mmap x                 0xde3b9f7c000  P readable   P readable  
mmap nrx               0xde39d077000  P readable   P readable  
mmap nwx               0xde32ae17000  P readable   P readable  
mmap xnwx              0xde3e37be000  P readable   P readable  
main                   0xde0e54b0410  P readable   P unreadable
libc                   0xde322e11a80  P readable   P unreadable