==== 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                  0x806d0436870  P readable   P unreadable
mmap xz                0x807491d2000  P unreadable P unreadable
mmap x                 0x8072633a000  P readable   P readable  
mmap nrx               0x8075e0b9000  P readable   P readable  
mmap nwx               0x807c1867000  P readable   P readable  
mmap xnwx              0x807ad2c7000  P readable   P readable  
main                   0x804cf1aa430  P readable   P unreadable
libc                   0x8072abf7fe0  P readable   P unreadable