Jörn Engel wrote:
>>The stack overflow checking in -mjb uses gcc's mcount mechanism to
>>detect overflows.  It should get called on every single function call.
> 
> Nice trick.  Do you have better documentation on that machanism than
> man gcc?  The paragraph to -p is quite short and I cannot make the
> connection to the rest of the patch immediately.

It is a nice trick, but I didn't write it :)  I stole the code from Ben
LaHaise, around 2.5.20.  All that I've needed to know to maintain the
patch is that a "jmp mcount" gets placed in the critical places.

I've attached a fairly recent version of the stack check patch.  If you
need some more examples, check out kernprof's use of it.  It's acg
functionality used mcount as well.
-- 
Dave Hansen
haveblue@us.ibm.com