question about libc.a libgcc.a

Dear all,

I am focus on a device driver. I compile it to a model.o and try to insmod it to kernel. But when do so, I will get:

unresolved symbol: __udividi3
unresolved symbol: __umoddi3

As someone tell me, I have to link the libgcc.a to my model.o. I did it but I when I try to insmod the model.o, I will get segamentation fault.

The following are my link libraries.
#LIBS =
$(MATLAB_ROOT)/rtw/c/lib/$(ARCH)/lrtwLib.a -L/usr/lib/gcc-lib/i386-redhat-li nux/2.96 -lgcc -L/usr/lib -lm -lc $(EXT_LIB) $(S_FUNCTIONS_LIB) $(INSTRUMENT_LIBS)

Please give me some ideas about it.

Thanks in advance
Hai Xu

[SNIPPED...]

You have some 64-bit divisions in your code. Make them shifts. Everything in drivers will be powers-of-two (except some dumb printk()s, where somebody tried to make decimals), so shifts should work fine. If you have some offending decimal math, fix it to display kbytes, megabytes, or gigabytes before you do do integer decimal conversion. That way you never have to do 64-bit math.

Don't link in the 'C' runtime library.

Cheers,
Dick Johnson

Penguin : Linux version 2.4.1 on an i686 machine (799.53 BogoMips).

I was going to compile a list of innovations that could be attributed to Microsoft. Once I realized that Ctrl-Alt-Del was handled in the BIOS, I found that there aren't any.

Umm, if you're linking a kernel module, you can't:

1. link libm
2. link libc
3. use floating point in kernel

--
Russell King ([email protected]) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html