Process virtual memory question

[Zhiui Zhang]

Although the 4.4 BSD design and implementation book says the text part of
a process starts from 0x0000,0000, it actually starts from some place
around 0x800,0000 (or 0x8048000 to be exact). What's in the area between 0
- 0x800,0000? Why do we not use it if it is left empty as shown by
/proc/pid/map?  How is the magic number 0x8048000 determined? Thanks.

-Zhihui




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