Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!cbatt!cwruecmp!nitrex!rbl
From: rbl@nitrex.UUCP
Newsgroups: comp.os.minix
Subject: Re: Stack growth
Message-ID: <421@nitrex.UUCP>
Date: Mon, 16-Feb-87 13:54:03 EST
Article-I.D.: nitrex.421
Posted: Mon Feb 16 13:54:03 1987
Date-Received: Tue, 17-Feb-87 06:01:41 EST
References: <966@ulowell.cs.ulowell.edu> <1565@cit-vax.Caltech.Edu> <1377@cbmvax.cbmvax.cbm.UUCP> <800@vaxb.calgary.UUCP>
Reply-To: rbl@nitrex.UUCP ( Robin Lake )
Organization: The Standard Oil Co., Cleveland
Lines: 20
Keywords: PDP-11, stack
Summary: PDP-11 stack grows downward from initialzed Stack Pointer register

In article <800@vaxb.calgary.UUCP> radford@calgary.UUCP (Radford Neal) writes:
>
>For example, on a stand-alone PDP 11, the stack grows down from the top of
>memory, *wherever that may be*. The program is loaded into low memory, which
>is always the same place. So you don't have to re-link all your programs
>when you buy more memory.
>
>     Radford Neal

Sorry, but in a stand-alone PDP-11 (without operating system) the stack grows
down from the address initialized in the Stack Pointer register.  There is
an interrupt generated whenever the stack pointer decrements below
octal 400 (I believe that's the value).  The programs are loaded above
the address initialized in the Stack Pointer register.  Typically (I guess
by custom) this address is octal 1000.


Rob Lake
decvax!cwruecmp!nitrex!rbl
cbatt!cwruecmp!nitrex!rbl