Re: [Xen-devel] Linking errors of Mini-OS for ARM32

[Julien Grall <julien.grall@xxxxxxxxx>]

On Sun, Jun 9, 2013 at 1:42 PM, Chen Baozi <baozich@xxxxxxxxx> wrote:
> Since finishing the very beginning setup assembly, I was turning to adding
> necessary headers and empty functions to build the binary. After introducing
> those bit operations, spinlocks etc., I thought I have a basic framework to
> pass the first build. However, when comming to the final linking stage,
> there are errors:
>
> arm-linux-gnueabihf-ld   -T arch/arm/minios-arm32.lds
> /home/cbz/src/xen/extras/mini-os/mini-os.o  -o
> //home/cbz/src/xen/extras/mini-os/mini-os
> /home/cbz/src/xen/extras/mini-os/mini-os.o: In function `init_blkfront':
> /home/cbz/src/xen/extras/mini-os/blkfront.c:122: undefined reference to 
> `__aeabi_uldivmod'
> /home/cbz/src/xen/extras/mini-os/blkfront.c:122: undefined reference to 
> `__aeabi_uldivmod'
> /home/cbz/src/xen/extras/mini-os/blkfront.c:122: undefined reference to 
> `__aeabi_uldivmod'
> /home/cbz/src/xen/extras/mini-os/blkfront.c:122: undefined reference to 
> `__aeabi_uldivmod'
> /home/cbz/src/xen/extras/mini-os/blkfront.c:122: undefined reference to 
> `__aeabi_uldivmod'
> /home/cbz/src/xen/extras/mini-os/mini-os.o:/home/cbz/src/xen/extras/mini-os/blkfront.c:122:
>  more undefined references to `__aeabi_uldivmod' follow
> /home/cbz/src/xen/extras/mini-os/mini-os.o:(.ARM.exidx+0x0): undefined 
> reference to `__aeabi_unwind_cpp_pr0'
> /home/cbz/src/xen/extras/mini-os/mini-os.o:(.ARM.exidx+0x50): undefined 
> reference to `__aeabi_unwind_cpp_pr0'
> make: *** [/home/cbz/src/xen/extras/mini-os/mini-os] Error 1
>
> I googled that error message. Some has mentioned that add "-fno-exceptions
>  -fno-unwind tables" could sovle the problem. I tried, but got the same
> errors.
>
> Any ideas?

You need to provide an implementation for __aeabi_uldivmod.
For this purpose, you can re-use xen/arch/arm/arm32/lib/lib1func.S

--
Grall Julien

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