Date:	Tue, 28 May 1996 20:49:25 -0500 (CDT)
Message-Id:	<199605290149.UAA04757@orion.math.uiuc.edu>
From:	Dan Grayson <dan AT math DOT uiuc DOT edu>
To:	djgpp-workers AT delorie DOT com
Subject:	djgpp and garbage collection
Reply-to:	drg AT uiuc DOT edu

I've been using Boehm's garbage collector for C, gc 4.5, and have gotten it
to work with djgpp.  (It's a plug-in replacement for malloc() (!!) and is
available freely at /ftp AT parcftp DOT xerox DOT com:/pub/gc).

One thing it needs to guess at is the location of the bottom of the stack.
No guessing gets it exactly right.  To provide this I added a line to crt0.s:

	je	no_memory
	addl	__stklen, %eax
-->	movl	%eax, ___djgpp_stackbottom
	movw	%ds, %dx		/* set stack */
	movw	%dx, %ss

(I also defined space for the variable elsewhere.)  It works fine.  Perhaps
you will consider adding this or something like it to a future release.

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