==== 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                  0xa935d50ea60  P readable   P unreadable
mmap xz                0xa9366020000  P unreadable P unreadable
mmap x                 0xa935e3fa000  P readable   P readable  
mmap nrx               0xa937e1b5000  P readable   P readable  
mmap nwx               0xa94004bd000  P readable   P readable  
mmap xnwx              0xa9367f2d000  P readable   P readable  
main                   0xa9110ce6410  P readable   P unreadable
libc                   0xa93a1d25630  P readable   P unreadable