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From: rbj@icst-cmr (root)
Newsgroups: net.lang.c
Subject: Args in Regs
Message-ID: <359@brl-smoke.ARPA>
Date: Mon, 28-Apr-86 15:23:23 EDT
Article-I.D.: brl-smok.359
Posted: Mon Apr 28 15:23:23 1986
Date-Received: Fri, 2-May-86 22:47:07 EDT
Sender: news@brl-smoke.ARPA
Lines: 11

> Why do so many of the micro operating systems
> insist on putting arguments in registers!!!.  Even MS-DOS expects
> arguments in registers rather than on the stack.

Surprise! Even UNIX (V6) does this! The reason is that the machine
generally uses the same regs in supervisor mode. This is easier than
trying to did the args out of the user's space, which entails accessing
another map entry. BSD seems to use the stack however.

	(Root Boy) Jim Cottrell		<rbj@cmr>
	"One man gathers what another man spills"