==== 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                  0xbc2d152b800  P readable   P unreadable
mmap xz                0xbc250d74000  P unreadable P unreadable
mmap x                 0xbc2b68fe000  P readable   P readable  
mmap nrx               0xbc2a65b5000  P readable   P readable  
mmap nwx               0xbc1f79c7000  P readable   P readable  
mmap xnwx              0xbc2ec64b000  P readable   P readable  
main                   0xbbfed6ca410  P readable   P unreadable
libc                   0xbc2500cfac0  P readable   P unreadable