linux-kernel - Re: Trying to convert old modules to newer kernels

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Date:	Thu, 20 Dec 2007 18:05:48 -0500
From:	"linux-os (Dick Johnson)" <linux-os@...logic.com>
To:	"Sam Ravnborg" <sam@...nborg.org>
Cc:	"Lennart Sorensen" <lsorense@...lub.uwaterloo.ca>,
	"Linux kernel" <linux-kernel@...r.kernel.org>
Subject: Re: Trying to convert old modules to newer kernels


On Thu, 20 Dec 2007, Sam Ravnborg wrote:

> On Thu, Dec 20, 2007 at 04:27:37PM -0500, linux-os (Dick Johnson) wrote:
>>
>> On Thu, 20 Dec 2007, Sam Ravnborg wrote:
>>
>>>>
>>>> It never gets to the printk(). You were right about the
>>>> compilation. Somebody changed the kernel to compile with
>>>> parameter passing in REGISTERS! This means that EVERYTHING
>>>> needs to be compiled the same way, 'C' calling conventions
>>>> were not good enough!
>>>
>>> How did you build the module. It reads like you failed to use
>>> kbuild to build your module which is why you did not pass
>>> correct options to gcc - correct?
>>>
>>> If you did not use kbuild - why not?
>>> Is there anything missing you need?
>>>
>>> 	Sam
>>>
>>
>> I need to get rid of -mregparm=3 on gcc's command line. It
>> is completely incompatible with the standard calling conventions
>> used in all our assembly-language files in our drivers. We make
>> very high-speed number-crunching drivers that munge high-speed
>> data into images. We need to do that in assembly as we have
>> always done.
> That I understand. So you need a CONFIG_ option to switch off
> -regparm=3 and pray that the kernel assembly supports it.
>
> And then I assume you avoided kbuild because it added -regparm=3
> which is why your simple module broke.
>
> As you are well aware there is not any testing of a kernel without
> -regparm=3 these days so you should strongly consider making your
> assembly module comply with -regparm=3.
>
> And no - I dunno how much work that is and what impact it has
> on your number chrunching stuff.
> But it looks like the only sane long-term solution to me.
>
> 	Sam
>

I may be able to make a file full of "adapters" if I
can figure out how to have a procedure that gets
called with parameters in registers, with it calling
conventional stuff. There used to be a macro, "asmlinkage"
that corrected the calling conventions for assembly-language
procedures. I will try to see what it did in some
older kernels. It got taken out of newer ones.


Cheers,
Dick Johnson
Penguin : Linux version 2.6.22.1 on an i686 machine (5588.29 BogoMips).
My book : http://www.AbominableFirebug.com/
_


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