linux-kernel - Re: Linux i386 clone(): %ebx 'frobbing' ?

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Message-ID: <20080215230722.GA8012@ubuntu>
Date:	Sat, 16 Feb 2008 01:07:22 +0200
From:	"Ahmed S. Darwish" <darwish.07@...il.com>
To:	Andreas Schwab <schwab@...e.de>
Cc:	libc-alpha@...rceware.org, libc-alpha@...rces.redhat.com,
	linux-kernel@...r.kernel.org
Subject: Re: Linux i386 clone(): %ebx 'frobbing' ?

Hi Andreas,

On Fri, Feb 15, 2008, Andreas Schwab wrote:
> "Ahmed S. Darwish" <darwish.07@...il.com> writes:
> 
> > I don't understand how the `fn' argument reached the child thread
> > in the %ebx register. It's said in the comment that `fn' will be
> > popped to child 'in the ebx frobbing below'. But what does that mean ?
> 
> See "popl %ebx" after "int $0x80".
> 

I hope I'm not misreading something obvious, but I can't find
the code where FUNC(%esp) is stored in %ebx before %ebx value
got pushed in the stack (and restored in above 'popl' statement).

Thanks a lot for help.

-- 
Ahmed S. Darwish
Homepage: http://darwish.07.googlepages.com
Blog: http://darwish-07.blogspot.com

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