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[#5] Validate user virtual address #47

Merged
merged 2 commits into from
Apr 10, 2017
Merged

[#5] Validate user virtual address #47

merged 2 commits into from
Apr 10, 2017

Commits on Apr 9, 2017

  1. [#5] Implement temporary exit() and write() 

    For a temporary measure, two basic system call `exit()` and `write()`
are implemented minimaly. `exit()` does not care about the process
hierarchy, but only triggers thread termination process after printing
given termination message. `write()` does not care about file
descriptor, except the standard output.

These features should be improved later.
    @hangpark
    hangpark committed Apr 9, 2017
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  2. [#5] Validate user virtual address 

    Now system call checks user's given address by using page fault.
`get_byte()` and `put_byte()` are given in the manual.
    @hangpark
    hangpark committed Apr 9, 2017
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