Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!hsi!hsi86!wright
From: wright@hsi86.hsi.com (Gary Wright)
Newsgroups: comp.sys.isis
Subject: isis port to DG/UX (GNU C and Motorola 88k)
Message-ID: <3606@hsi86.hsi.com>
Date: 14 May 91 15:31:42 GMT
Organization: 3M Health Information Systems, Wallingford, CT
Lines: 31

I am in the process of porting ISIS 2.1 to Data General's
AViiON machines.  The DG/UX environment is basically
System V with a version of the GNU C compiler for the
88000 chip.

I have made a first pass at modifying the ISIS tasking system for
this environment but I am still having trouble compiling
clib to test it.  The function do_bcast in cl_bcast.c seems to
construct a new task and in the process duplicates the stack
of the current task.  The code at the very end of the function
seems to make a couple of assumptions:

	1) all the arguments are on the stack
	2) va_list is of type (char *)

Neither of these assumptions are true in this environment because
GNU C passes arguments using registers and the stack.
va_list is actually a structure that is manipulated by va_start
and va_arg.

So my question for the net is has anyone ported ISIS 2.1 to this environment
or a similar environment (i.e. GNU C or register/stack passing conventions)
and can they provide any tips?  I'd like to avoid getting into all the
gory details of varargs.h if possible.  If you have ISIS 2.1 ported to
a 386 version of unix (SCO Xenix/Unix) I'd also like to get in touch with 
you.

Thanks in advance.
-- 
Gary Wright                                                 ...!uunet!hsi!wright
3M Health Information Systems					  wright@hsi.com