Message-Id:	<9803200230.AA22825@gcef.gc.maricopa.edu>
Date:	Thu, 19 Mar 1998 19:30:09 -0700 (MST)
From:	"Joshua James Turpen" <44699 AT ef DOT gc DOT maricopa DOT edu>
To:	djgpp AT delorie DOT com
Subject:	Does GCC & libc assume SS == DS?

Is it safe to write code that has SS != DS?  I was hoping to be able to
allocate a descriptor, set it's base address to somewhere in my DS
(malloc'd ptr), and then set it's limit to the size of my new stack, to
catch stack faults. 

I need to do this (or something like it) for the LWP package, becuase it
currently can't catch stack faults.  

This could be done by allocating more space than I need, and then doing an
mprotect at both ends of the space (to catch stack overflow/underflow),
but a wild pointer could jump completely past the protected regions.  Is the
descriptor method a possible alternative?


Josh
44699 AT ef DOT gc DOT maricopa DOT edu

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