==== 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                  0xc3a59c4e9c0  P readable   P unreadable
mmap xz                0xc3a789cf000  P unreadable P unreadable
mmap x                 0xc3a6a7a2000  P readable   P readable  
mmap nrx               0xc3a7bdb3000  P readable   P readable  
mmap nwx               0xc39fa7e5000  P readable   P readable  
mmap xnwx              0xc3ab087b000  P readable   P readable  
main                   0xc37e7277420  P readable   P unreadable
libc                   0xc3a4d50bdf0  P readable   P unreadable