Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!wuarchive!udel!mmdf
From:         Christoph van Wuellen <HBO043%DJUKFA11.BITNET@cunyvm.cuny.edu>
Newsgroups: comp.os.minix
Subject:      Re: Idea for sep. data & stack segs.
Message-ID: <55458@nigel.ee.udel.edu>
Date: 4 Jun 91 20:15:26 GMT
Sender: mmdf@ee.udel.edu
Lines: 12

How do you decide, if a pointer is given to a function, if it
should point to the stack or to the data segment?

This only works if stack and data are far (ca. 4 GByte) away so you can
tell a (legal) stack-low condition from an illegal access beyond the
data segment border (e.g. by assuming that accesses to the upper 2 GByte
reference the stack segment).

If ANY access beyond the current brk value just allocates space for the
stack, this is of no use.

C.v.W.