Doubt regarding __udivdi3

Doubt regarding __udivdi3

[Gaurav Mahajan]

Hi all,

I'm trying to insert a module into the kernel (2.6.35.5). There are no
errors during the "make" phase. There are only warnings regarding two
symbols :
WARNING: "__udivdi3"
[/media/Study/project_work/splitting_merging/radc_try1/radc1.ko]
undefined!
WARNING: "__umoddi3"
[/media/Study/project_work/splitting_merging/radc_try1/radc1.ko]
undefined!

But during the "insmod" step, the module is not getting inserted into
the kernel saying that there is an undefined symbol in the .ko file of
the module.

dmesg O/P :

adc1: Unknown symbol __fixsfsi (err 0)
radc1: Unknown symbol __umoddi3 (err 0)
radc1: Unknown symbol __udivdi3 (err 0)
radc1: Unknown symbol __floatundisf (err 0)
radc1: Unknown symbol __umoddi3 (err 0)
radc1: Unknown symbol __udivdi3 (err 0)


If anyone can help me with tackling these errors, it would be really
helpful......

Regards,
Gaurav

Doubt regarding __udivdi3

[Asutosh Das]

Hi
I think you should check if these symbols are exported. i.e. If these
symbols are in EXPORT_SYMBOL("<symbol name>"). If these are not
exported then you would not be able to use it. I don't think you can
insert the module with the "symbol unresolved" warning.

On 5 January 2011 17:36, Gaurav Mahajan <gauravmahajan2007@gmail.com> wrote:
> Hi all,
>
> I'm trying to insert a module into the kernel (2.6.35.5). There are no
> errors during the "make" phase. There are only warnings regarding two
> symbols :
> WARNING: "__udivdi3"
> [/media/Study/project_work/splitting_merging/radc_try1/radc1.ko]
> undefined!
> WARNING: "__umoddi3"
> [/media/Study/project_work/splitting_merging/radc_try1/radc1.ko]
> undefined!
>
> But during the "insmod" step, the module is not getting inserted into
> the kernel saying that there is an undefined symbol in the .ko file of
> the module.
>
> dmesg O/P :
>
> adc1: Unknown symbol __fixsfsi (err 0)
> radc1: Unknown symbol __umoddi3 (err 0)
> radc1: Unknown symbol __udivdi3 (err 0)
> radc1: Unknown symbol __floatundisf (err 0)
> radc1: Unknown symbol __umoddi3 (err 0)
> radc1: Unknown symbol __udivdi3 (err 0)
>
>
> If anyone can help me with tackling these errors, it would be really
> helpful......
>
> Regards,
> Gaurav
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>



-- 
Thank you,
Warm Regards,
Asutosh Das
# (91) 9818 4494 69

Doubt regarding __udivdi3

[Ponmuthu Subramaniam Nandan]

Hi Gaurav,

I'm trying to insert a module into the kernel (2.6.35.5). There are no
> errors during the "make" phase. There are only warnings regarding two
> symbols :
> WARNING: "__udivdi3"
> [/media/Study/project_work/splitting_merging/radc_try1/radc1.ko]
> undefined!
> WARNING: "__umoddi3"
> [/media/Study/project_work/splitting_merging/radc_try1/radc1.ko]
> undefined!
>
> The symbol __udivdi3 & __umoddi3 are compiler generated functions calls for
specific
Arithmetic function in your code (In this case its division). The
definitions of that function
(for the specific ARCH your are building for) would be in the respective
libraries (libgcc).

In your case, verify where you are (a) using the right cross compilers  &
(b) right cross-compiling libraries to link.
Compile & Link without errors, and you should be able to insert the module
properly.

And one more thing, the libraries used for linking as well as libraries used
during run time should be same
to ensure ABI (Application binary interface) compatibility between them.
ABI defines the standard for procedure call.

Regards,
Subbu
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Doubt regarding __udivdi3

[Bernd Petrovitsch]

On Mit, 2011-01-05 at 19:21 +0530, Ponmuthu Subramaniam Nandan wrote:
> Hi Gaurav,
> 
>         I'm trying to insert a module into the kernel (2.6.35.5).
>         There are no
>         errors during the "make" phase. There are only warnings
>         regarding two
>         symbols :
>         WARNING: "__udivdi3"
>         [/media/Study/project_work/splitting_merging/radc_try1/radc1.ko]
>         undefined!
>         WARNING: "__umoddi3"
>         [/media/Study/project_work/splitting_merging/radc_try1/radc1.ko]
>         undefined!
>         
> The symbol __udivdi3 & __umoddi3 are compiler generated functions
> calls for specific 
> Arithmetic function in your code (In this case its division). The
> definitions of that function 
> (for the specific ARCH your are building for) would be in the
> respective libraries (libgcc). 

The first hit on google is
http://stackoverflow.com/questions/1063585/udivdi3-undefined-howto-find-code.

That should explain it. 
Bernd
-- 
Bernd Petrovitsch                  Email : bernd at petrovitsch.priv.at
                     LUGA : http://www.luga.at