Linux-2.6.5-1.358 SMP

Linux-2.6.5-1.358 SMP

[Richard B. Johnson]

Hello,

I almost have everything converted over from 2.4.26 to
2.6.whatever.

I need to make some modules that have lots of assembly code.
This assembly uses the UNIX calling convention and can't be
re-written (it would take many months). The new kernel
is compiled with "-mregparam=2". I can't find where that's
defined. I need to remove it because I cannot pass parameters
to the assembly stuff in registers.

Where is it defined??? I grepped through all the scripts and
the hidden files, but I can't discover where it's defined.


Cheers,
Dick Johnson
Penguin : Linux version 2.4.26 on an i686 machine (5570.56 BogoMips).
            Note 96.31% of all statistics are fiction.

Re: Linux-2.6.5-1.358 SMP

[Jan Dittmer]

Richard B. Johnson wrote:
> Hello,
> 
> I almost have everything converted over from 2.4.26 to
> 2.6.whatever.
> 
> I need to make some modules that have lots of assembly code.
> This assembly uses the UNIX calling convention and can't be
> re-written (it would take many months). The new kernel
> is compiled with "-mregparam=2". I can't find where that's
> defined. I need to remove it because I cannot pass parameters
> to the assembly stuff in registers.
> 
> Where is it defined??? I grepped through all the scripts and
> the hidden files, but I can't discover where it's defined.

You don't mean CONFIG_REGPARM=n:

arch/i386/Makefile:cflags-$(CONFIG_REGPARM)     += $(shell if [ 
$(GCC_VERSION) -ge 0300 ] ; then echo "-mregparm=3"; fi ;)

?

Jan

Re: Linux-2.6.5-1.358 SMP

[Nathan Bryant]

Richard B. Johnson wrote:
> Hello,
> 
> I almost have everything converted over from 2.4.26 to
> 2.6.whatever.
> 
> I need to make some modules that have lots of assembly code.
> This assembly uses the UNIX calling convention and can't be
> re-written (it would take many months). The new kernel
> is compiled with "-mregparam=2". I can't find where that's
> defined. I need to remove it because I cannot pass parameters
> to the assembly stuff in registers.
> 
> Where is it defined??? I grepped through all the scripts and
> the hidden files, but I can't discover where it's defined.

In the 2.6.8 that's shipping in Fedora, it's a config option: CONFIG_REGPARM

Re: Linux-2.6.5-1.358 SMP

[Richard B. Johnson]

On Wed, 6 Oct 2004, Jan Dittmer wrote:

> Richard B. Johnson wrote:
> > Hello,
> >
> > I almost have everything converted over from 2.4.26 to
> > 2.6.whatever.
> >
> > I need to make some modules that have lots of assembly code.
> > This assembly uses the UNIX calling convention and can't be
> > re-written (it would take many months). The new kernel
> > is compiled with "-mregparam=2". I can't find where that's
> > defined. I need to remove it because I cannot pass parameters
> > to the assembly stuff in registers.
> >
> > Where is it defined??? I grepped through all the scripts and
> > the hidden files, but I can't discover where it's defined.
>
> You don't mean CONFIG_REGPARM=n:
>
> arch/i386/Makefile:cflags-$(CONFIG_REGPARM)     += $(shell if [
> $(GCC_VERSION) -ge 0300 ] ; then echo "-mregparm=3"; fi ;)
>
> ?

Okay. Thanks. I wouldn't have guessed what to look for.



Cheers,
Dick Johnson
Penguin : Linux version 2.4.26 on an i686 machine (5570.56 BogoMips).
            Note 96.31% of all statistics are fiction.

Re: Linux-2.6.5-1.358 SMP

[Roland Dreier]

    Richard> I need to make some modules that have lots of assembly
    Richard> code.  This assembly uses the UNIX calling convention and
    Richard> can't be re-written (it would take many months). The new
    Richard> kernel is compiled with "-mregparam=2". I can't find
    Richard> where that's defined. I need to remove it because I
    Richard> cannot pass parameters to the assembly stuff in
    Richard> registers.

You should be able to use CONFIG_REGPARM to control this.  Another
option is just to mark the functions in your source as "asmlinkage"
(which is defined to "__attribute__((regparm(0)))" in
asm-i386/linkage.h).  The advantage of using asmlinkage is that your
code will work with anyone's kernel.

 - Roland

Re: Linux-2.6.5-1.358 SMP

[root]

On Tue, 5 Oct 2004, Roland Dreier wrote:

>    Richard> I need to make some modules that have lots of assembly
>    Richard> code.  This assembly uses the UNIX calling convention and
>    Richard> can't be re-written (it would take many months). The new
>    Richard> kernel is compiled with "-mregparam=2". I can't find
>    Richard> where that's defined. I need to remove it because I
>    Richard> cannot pass parameters to the assembly stuff in
>    Richard> registers.
>
> You should be able to use CONFIG_REGPARM to control this.  Another
> option is just to mark the functions in your source as "asmlinkage"
> (which is defined to "__attribute__((regparm(0)))" in
> asm-i386/linkage.h).  The advantage of using asmlinkage is that your
> code will work with anyone's kernel.
>
> - Roland
>

Ahah!  I just put that in the headers that define the functions??

Re: Linux-2.6.5-1.358 SMP

[Roland Dreier]

    root> Ahah!  I just put that in the headers that define the functions??

I'm not enough of a gcc expert to know for sure, but I think you need
it in both the functions and the actual source.  You can grep the
kernel source for "asmlinkage" to find dozens of examples of its use.

 - Roland