Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!pacbell!att-ih!ihnp4!fortune!rlk
From: rlk@fortune.UUCP (Robert Krause Rlk)
Newsgroups: comp.emacs
Subject: Longer than 24-bit addressing in gnu-emacs 18.49
Message-ID: <481@fortune.UUCP>
Date: 25 Mar 88 17:54:30 GMT
Organization: Fortune Systems/SCI Technology Inc., Belmont CA
Lines: 19
Keywords: Lisp_Object, 32-bit addressing

I work for Fortune Systems in Berkeley. I'm in the process of porting gnumacs
to Fortune's soon-to-be-released 5.3.1 Un*x system that runs in a 68020 box.
The problem I'm currently confronted with is that the code having to do with
Lisp_Objects seems to assume that these objects are at most 4 bytes in length.
With a type field of at least 5 bits, that leaves only 24 to 28 bits for an
address field. Given that our stacks grow downward from 0x1fffffff and our data
segments grow upward from 0x4a00000 we can't contain the necessary pointer in 28
bits or less. I can think of several possible solutions (read kludges) to this
problem but before I begin implementing anything I would like to know if
anybody else has had this problem and whether a concensus has developed
as to how to resolve it.

Reply to me directly if you like but this may be of common interest to the net
if it has not already been discussed.

Bob Krause
hplabs!fortune!forbrk!rlk
2560 9th St.
Berkeley, Ca.
	94703