==== 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                  0x90d8879de50  P readable   P unreadable
mmap xz                0x90c97473000  P unreadable P unreadable
mmap x                 0x90c99f5a000  P readable   P readable  
mmap nrx               0x90d75013000  P readable   P readable  
mmap nwx               0x90cc20d1000  P readable   P readable  
mmap xnwx              0x90c99506000  P readable   P readable  
main                   0x90a8a785420  P readable   P unreadable
libc                   0x90cd06bfc50  P readable   P unreadable