==== 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                   0x7638260e70  P readable   P unreadable
mmap xz                 0x76a4700000  P unreadable P unreadable
mmap x                  0x75efad4000  P readable   P readable  
mmap nrx                0x7606e80000  P readable   P readable  
mmap nwx                0x7644018000  P readable   P readable  
mmap xnwx               0x76bfbe5000  P readable   P readable  
main                    0x73d6455430  P readable   P unreadable
libc                    0x76bd7dc9e0  P readable   P unreadable