another question - VM mappings

[Wojciech Puchar]

below is mapping for very simple process (no libc etc)

[wojtek at laptop ~]$ procstat -v 917
   PID              START                END PRT  RES PRES REF SHD   FL TP PATH
   917           0x400000           0x401000 r-x    1    0   1   0 CN-- vn /home/wojtek/test/1
   917           0x600000           0x601000 rw-    1    0   1   0 ---- df
   917     0x7ffffffdf000     0x7ffffffff000 rw-    1    0   1   0 ---D df
   917     0x7ffffffff000     0x800000000000 r-x    0    0  39   0 ---- ph


what is "ph" mapping and why read&executable?