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Date:      Wed, 04 Dec 2002 12:25:43 -0500 (EST)
From:      John Baldwin <jhb@FreeBSD.org>
To:        Andrew Gallatin <gallatin@cs.duke.edu>
Cc:        alpha@FreeBSD.ORG, Yoriaki FUJIMORI <fujimori@ns.fujimori.cache.waseda.ac.jp>, alex <lex@adelaide.on.net>
Subject:   Re: link_elf: symbol osf1_wait4 undefined
Message-ID:  <XFMail.20021204122543.jhb@FreeBSD.org>
In-Reply-To: <15854.1646.533496.929062@grasshopper.cs.duke.edu>

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On 04-Dec-2002 Andrew Gallatin wrote:
> 
> alex writes:
>  > ahhhh. That solved the problem. 
>  > What is the technical reason for having to load the osf1 module first ?
> 
> Linux/alpha uses the same ABI as OSF/1 for a number of functions,
> since they bootstrapped themselves from OSF/1 on alpha and never
> bothered to go fully native.  This ABI is already provided by our
> osf1.ko module.
> 
> The problem is that the osf1.ko module is SUPPOSED to be automatically
> loaded as a dependancy of the linux module.  I've asked the person who
> wrote the module dependancy code for help on this, but he's moved on
> to other things and has never answered.  If somebody wants to look
> into this, that would be great.  I've never been able to figure it
> out.

The problem is here:

> grep MODULE *
linux_sysvec.c:MODULE_VERSION(linux, 1);
linux_sysvec.c:MODULE_DEPEND(linux, osf1, 1, 1, 1);
linux_sysvec.c:MODULE_DEPEND(linux, sysvmsg, 1, 1, 1);
linux_sysvec.c:MODULE_DEPEND(linux, sysvsem, 1, 1, 1);
linux_sysvec.c:MODULE_DEPEND(linux, sysvshm, 1, 1, 1);
linux_sysvec.c:DECLARE_MODULE(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);

All the dependencies are recorded for the non-existent linux module.
In actuality, on Alpha there is a linuxelf module, and on i386 there
are linuxelf and linuxaout modules.  I'm trying to think about the
best way to go about fixing this.

Well, I have an untested patch at
http://www.FreeBSD.org/~jhb/patches/linux.patch that might fix this.
FWIW, the dependency of linux compat on the SYSV modules was broken on
both i386 and alpha for the same reason.  Use 'patch -p6' to apply this
patch btw.

-- 

John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/

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