==== 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                  0xf1ec9881750  P readable   P unreadable
mmap xz                0xf1e40923000  P unreadable P unreadable
mmap x                 0xf1e5c613000  P readable   P readable  
mmap nrx               0xf1e50e2b000  P readable   P readable  
mmap nwx               0xf1eb3d4a000  P readable   P readable  
mmap xnwx              0xf1e23875000  P readable   P readable  
main                   0xf1be5550420  P readable   P unreadable
libc                   0xf1e051394b0  P readable   P unreadable