Re: Segfault on the i386 enter instruction

[Andi Kleen]

> http://groups.google.co.nz/groups?selm=7i86ni%24b7n%241%40palladium.transmeta.com

Linus' reasoning is actually outdated - on most modern x86s it is not
slower than the expanded code sequence because it will generate the
same number of macro/u-ops. But it would be still extremly ugly to 
implement, which is a good reason not to.

> And perhaps x86-64 is handled different because of the red zone (some
> memory below the stack-pointer that can be accessed legally)?

Yes, but it's only 128 bytes so it won't help for larger frames.
It will also work if you preextended the stack before, but i wouldn't
rely on it.

-Andi
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