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From: Andreas Schwab <>
To: "Ahmed S. Darwish" <>
Subject: Re: Linux i386 clone(): %ebx 'frobbing' ?
Date: Sat, 16 Feb 2008 00:28:11 +0100
Message-ID: <> (raw)
In-Reply-To: <20080215230722.GA8012@ubuntu> (Ahmed S. Darwish's message of "Sat\, 16 Feb 2008 01\:07\:22 +0200")

"Ahmed S. Darwish" <> writes:

> Hi Andreas,
> On Fri, Feb 15, 2008, Andreas Schwab wrote:
>> "Ahmed S. Darwish" <> 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).

It is stored in the new stack for the child, as explained in the
comment.  The parent has a different stack.


Andreas Schwab, SuSE Labs,
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

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Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-15 18:42 Ahmed S. Darwish
2008-02-15 20:07 ` Andreas Schwab
2008-02-15 23:07   ` Ahmed S. Darwish
2008-02-15 23:28     ` Andreas Schwab [this message]
2008-02-15 23:54       ` Ahmed S. Darwish

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