Same mipsel binary für 2.4 and 2.6 kernel possible?

Same mipsel binary für 2.4 and 2.6 kernel possible?

[Klatt Uwe]

Hello,

I have a custom hardware (AU1100) with kernel 2.4 and an working binary using floats (compiled with gcc 3.3.5).
Now I am testing with kernel 2.6.

When I use the old binary, float math isn't working anymore.
I have to recompile the source with new gcc 4.1.2 but then the new binary is working only on kernel 2.6.

Can somebody give me some hints, how to chage settings for kernel 2.6 creation or compiler settings to generate an universal binary.

Thanks
Uwe

Re: [SPAM] Same mipsel binary für 2.4 and 2.6 kernel possible?

[Markus Gothe]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Looks like the FPU-Emulator isn't working. Which kernel versions are
you using?

//Markus

Klatt Uwe wrote:
> Hello,
>
> I have a custom hardware (AU1100) with kernel 2.4 and an working binary
using floats (compiled with gcc 3.3.5).
> Now I am testing with kernel 2.6.
>
> When I use the old binary, float math isn't working anymore.
> I have to recompile the source with new gcc 4.1.2 but then the new
binary is working only on kernel 2.6.
>
> Can somebody give me some hints, how to chage settings for kernel 2.6
creation or compiler settings to generate an universal binary.
>
> Thanks
> Uwe
>


- --
_______________________________________

Mr Markus Gothe
Software Engineer

Phone: +46 (0)13 21 81 20 (ext. 1046)
Fax: +46 (0)13 21 21 15
Mobile: +46 (0)70 348 44 35
Diskettgatan 11, SE-583 35 Linköping, Sweden
www.27m.com
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFI03Pn6I0XmJx2NrwRCH4eAJwMWR2/SrFaWRJAWMul9sK/GvATdQCaAgmJ
LnzfYvUmO6mzyV5QMKtCmKs=
=dP4U
-----END PGP SIGNATURE-----

Re: Same mipsel binary für 2.4 and 2.6 kernel possible?

[Ralf Baechle]

On Fri, Sep 19, 2008 at 09:58:29AM +0200, Klatt Uwe wrote:

> I have a custom hardware (AU1100) with kernel 2.4 and an working binary using floats (compiled with gcc 3.3.5).
> Now I am testing with kernel 2.6.
> 
> When I use the old binary, float math isn't working anymore.
> I have to recompile the source with new gcc 4.1.2 but then the new binary is working only on kernel 2.6.

Are you using the kernel floating point emulator or a software floating
point library?

Whatever, it sounds like a bug.  The kernel is supposed to be backward
compatible with old binaries.

  Ralf

AW: Same mipsel binary für 2.4 and 2.6 kernel possible?

[Klatt Uwe]

Hello Ralf,

I link both binaries with -lm.
Could it be a problem with libc?
I will try to compile the new kernel with old compiler...

Bye
Uwe

> Are you using the kernel floating point emulator or a
> software floating
> point library?
>
> Whatever, it sounds like a bug.  The kernel is supposed to be backward
> compatible with old binaries.
>
>   Ralf
>

Re: Same mipsel binary für 2.4 and 2.6 kernel possible?

[Kevin D. Kissell]

When you say "float math isn't working", what do you mean?  When you say 
that the new binary
only works with the 2.6 kernel, what do you mean?  Are you getting bad 
answers, or is the program
crashing?  If it's crashing, and you run it under gdb, where is it 
blowing up, and why?  Are you able
to re-create the "old" binary?   If you do a static link of the program 
using the old tools,
does the resulting binary work better under 2.6?

The FPU emulator has bad some minor cleanup over the past few years, but 
it's been pretty
stable, and I can't recall having seen any serious functional or 
compatibility problems in a long
time.  I think it's more likely that you've got a problem with libraries 
and/or build procedures
for the application.

          Regards,

          Kevin K.

Klatt Uwe wrote:
> Hello,
>
> I have a custom hardware (AU1100) with kernel 2.4 and an working binary using floats (compiled with gcc 3.3.5).
> Now I am testing with kernel 2.6.
>
> When I use the old binary, float math isn't working anymore.
> I have to recompile the source with new gcc 4.1.2 but then the new binary is working only on kernel 2.6.
>
> Can somebody give me some hints, how to chage settings for kernel 2.6 creation or compiler settings to generate an universal binary.
>
> Thanks
> Uwe
>
>
>   

AW: Same mipsel binary für 2.4 and 2.6 kernel possible?

[Klatt Uwe]

Hello everybody,

> I think it's more likely that you've got a problem
> with libraries and/or build procedures
> for the application.
You are right!

It's a problem with shared libs.
When I link static everything works now.
Thank you for your patience.

Bye
Uwe