==== 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                  0x2e7ba1093a0  P readable   P unreadable
mmap xz                0x2e6eb7f3000  P unreadable P unreadable
mmap x                 0x2e7800ac000  P readable   P readable  
mmap nrx               0x2e6d5b77000  P readable   P readable  
mmap nwx               0x2e753f81000  P readable   P readable  
mmap xnwx              0x2e7931a5000  P readable   P readable  
main                   0x2e4bd2ca420  P readable   P unreadable
libc                   0x2e7860d1b00  P readable   P unreadable