==== 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                  0xd52ab32ef30  P readable   P unreadable
mmap xz                0xd527a1fb000  P unreadable P unreadable
mmap x                 0xd523f754000  P readable   P readable  
mmap nrx               0xd52e5fbd000  P readable   P readable  
mmap nwx               0xd52d520e000  P readable   P readable  
mmap xnwx              0xd5218dae000  P readable   P readable  
main                   0xd4ff5a23420  P readable   P unreadable
libc                   0xd525ac0b180  P readable   P unreadable