Re: PAX mprotect and JIT

[Mouse <mouse%Rodents-Montreal.ORG@localhost>]

> Aside: Do we need any additional memory barriers to synchronize
> writing to code with executing the code in memory?

On some CPU architectures you do (eg, the Super-H used by the
Dreamcast, at least when the D$ is configured write-back, and probably
even if it's configured WT if you don't flush the I$).

Well, you need something.  I'm not sure how fair "memory barriers" is
as a term for cache pushes/flushes.

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