Messages in this thread | | | Date | Mon, 23 Aug 2004 11:04:28 -0400 | From | Lei Yang <> | Subject | Re: Problems compiling kernel modules |
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Richard B. Johnson wrote: > On Mon, 23 Aug 2004, Lei Yang wrote: > > >>Richard B. Johnson wrote: >> >> >>>Do `depmod -e test.ko` to see what it's complaining about. You >>>can see all the symbols by using `nm`. Try it. Your code >>>probably didn't define the necessary stuff to make a module. >>>You need to look at a typical module (driver) that comes with the >>>kernel. Just find one of the shortest ".c" files in the driver >>>tree. >> >>Thanks! I did less /var/log/messages, and got the unknown symbols >>Unknown symbol __divsf3 >>Unknown symbol __fixsfsi >>Unknown symbol __subsf3 >>Unknown symbol __floatsisf >>Unknown symbol __mulsf3 >>Unknown symbol __gesf2 >>Unknown symbol __addsf3 >> >>However, I don't know what those symbols are :( I am a bit worried that >>maybe I've done something that is not supported by the kernel, like >>left-shift 16 bits of an int, or floating operations. >> >>Any hints? >> >>Thanks a lot! >>Lei > > > You cannot use floating-point in the kernel. It appears that you > are trying to make user-mode code execute within the kernel. It > can't. That's not what a module does. The kernel executes code > on behalf of the user-mode caller, in the context of the caller. > It does things, on behalf of the user, that the user can't > be trusted to do properly by himself. That's all the kernel > is for! Any calculations and similar stuff can be done in > regular user-mode code.
Sort of, I am trying to make a usr mode library work with kernel. However, floating point operation is necessary in the algorithm. You mean that this can never be done? Is changing floating-point the only thing I can do now?
Thanks! Lei
> Cheers, > Dick Johnson > Penguin : Linux version 2.4.26 on an i686 machine (5570.56 BogoMips). > Note 96.31% of all statistics are fiction. > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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