linux - pmap result shows many file are mapped from virtual address zero -

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for init process, pid 1, , other processes, when use pmap show mmapped file, results show this:

0000000000000000      0k r-x--  /sbin/init 0000000000000000      0k r----  /sbin/init 0000000000000000      0k rw---  /sbin/init 0000000000000000      0k -----    [ stack ] 0000000000000000      0k rw---    [ stack ] 0000000000000000      0k r-x--  /lib/libc-2.12.2.so 0000000000000000      0k -----  /lib/libc-2.12.2.so 0000000000000000      0k r----  /lib/libc-2.12.2.so 0000000000000000      0k rw---  /lib/libc-2.12.2.so 0000000000000000      0k rw---    [ stack ] 0000000000000000      0k r-x--  /lib/ld-2.12.2.so 0000000000000000      0k rw---    [ stack ] 0000000000000000      0k rw---    [ stack ] 0000000000000000      0k r-x--    [ stack ] 0000000000000000      0k rw---  /lib/ld-2.12.2.so 0000000000000000      0k rw---    [ stack ] 0000000000000000      0k rw---    [ stack ] ffffffffff600000      4k r----    [ anon ]  total                4k

why happens? virtual address except last 1 start 0 , size zero.


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