modules, insmod and multiple object files

modules, insmod and multiple object files

[Herrmann, Achim]

Hi,

I'm new to device driver development under linux and I've a basic question
concerning modules, insmod and multiple object files.

Assume I have two object files "main.o" and "hwaccess.o". 
main.o contains the functions init_module(), cleanup_module() and some other
functions.
hwaccess.o contains some routines to access the hardware. The functions in
main.o depend on the routines existing in hwaccess.o.

main.o was created using language "C": gcc -c main.c -o main.o
and 
hwaccess.o was created using assembler: nasm -f elf hwaccess.asm -o
hwaccess.o

Is there a possibility to combine these two object files, so that I have a
module which is loadable by insmod?


Thanks in advance
Achim



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Re: modules, insmod and multiple object files

[Peter Samuelson]

[Achim Herrmann]
> main.o was created using language "C": gcc -c main.c -o main.o
> and 
> hwaccess.o was created using assembler: nasm -f elf hwaccess.asm -o
> hwaccess.o
> 
> Is there a possibility to combine these two object files, so that I
> have a module which is loadable by insmod?

I'm not very familiar with 'nasm', but assuming it produces regular elf
object files:

  $(LD) -r -o {target}.o main.o hwaccess.o

'$(LD) -r' is used lots of places in kernel makefiles already.  (Too
many places, actually, most of which could and should be automated.
Kai Germaschewski has recently done some work to this end.)

Peter
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