[#5] Validate user virtual address #47
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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.
Now system call checks user's given address by using page fault. `get_byte()` and `put_byte()` are given in the manual.
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See #5.
Now system call checks user's given address by using page fault.
get_byte()andput_byte()are given in the manual.For a temporary measure, two basic system call
exit()andwrite()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.