Date: Wed, 01 Dec 1999 13:13:26 +0100 From: Marcel Moolenaar <marcel@scc.nl> To: Ville-Pertti Keinonen <will@iki.fi> Cc: dillon@apollo.backplane.com, bde@zeta.org.au, current@FreeBSD.ORG Subject: Re: kernel: -mpreferred-stack-boundary=2 ?? Message-ID: <384510E6.6FB29574@scc.nl> References: <19991201114859.29382.qmail@ns.demophon.com>
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Ville-Pertti Keinonen wrote:
> Perhaps crt1.c should call main like this (I can't immediately figure
> out whether the stack pointer should be correctly aligned before the
> return address is pushed or after the previous stack frame is pushed,
> this is assuming the former, s/subl/addl/ would change it).
The stack must be aligned before the return address is pushed:
The following C fragment
f(1);
f(2);
Translates to
addl $-12,%esp
pushl $1
call f
addl $16,%esp
addl $-12,%esp
pushl $2
call f
addl $16,%esp
This assumes the stack is already aligned, of course.
--
Marcel Moolenaar mailto:marcel@scc.nl
SCC Internetworking & Databases http://www.scc.nl/
The FreeBSD project mailto:marcel@FreeBSD.org
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