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Re: Linux i386 clone(): %ebx 'frobbing' ?
- From: "Ahmed S. Darwish" <darwish dot 07 at gmail dot com>
- To: Andreas Schwab <schwab at suse dot de>
- Cc: libc-alpha at sourceware dot org, libc-alpha at sources dot redhat dot com, linux-kernel at vger dot kernel dot org
- Date: Sat, 16 Feb 2008 01:07:22 +0200
- Subject: Re: Linux i386 clone(): %ebx 'frobbing' ?
- References: <20080215184228.GA6687@ubuntu> <jewsp69e5t.fsf@sykes.suse.de>
Hi Andreas,
On Fri, Feb 15, 2008, Andreas Schwab wrote:
> "Ahmed S. Darwish" <darwish.07@gmail.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