[TUHS] Harvard and Von Neumann Architectures and Unix

Lars Brinkhoff lars at nocrew.org
Tue Nov 28 04:30:03 AEST 2017


Lawrence Stewart wrote:
> Noel Chiappa wrote:
>> Programs which emit these little 'custom code fragments' (I prefer
>> that term, since they aren't really 'self-modifying code' - which I
>> define as 'a program which _changes_ _existing_ instructions) must
>> have some way of having a chunk of memory into which they can write,
>> but which can also be executed.
>
> In POSIX systems, the mprotect(2) syscall can set execute permissions.

Or if a statically allocated space is ok, just set your pages to rwx in
the executable image file.


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