> I guess the rest of the page contains 0?

No, it contains a truncated copy of the sigcode.

> It would be better if it contained "trap" instructions.  We still don't
> have an ideal way of doing that tho.

That would work, but that would make the code a bit more complicated.
And I'm not sure it's worth doing anyway. Running into an unmapped page
will segfault anyway.

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