==== 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                  0xb090b3294c0  P readable   P unreadable
mmap xz                0xb0942500000  P unreadable P unreadable
mmap x                 0xb097f6c1000  P readable   P readable  
mmap nrx               0xb0923884000  P readable   P readable  
mmap nwx               0xb09b72f3000  P readable   P readable  
mmap xnwx              0xb094bc03000  P readable   P readable  
main                   0xb06f68ba430  P readable   P unreadable
libc                   0xb09783975f0  P readable   P unreadable