Re: Linking errors of Mini-OS for ARM32

[Chen Baozi <baozich@gmail.com>]

On Sun, Jun 09, 2013 at 02:48:42PM +0100, Julien Grall wrote:
> On Sun, Jun 9, 2013 at 1:42 PM, Chen Baozi <baozich@gmail.com> 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

Thanks a lot.

A further question. I'm a litte curious that whether __aeabi_uldivmod is missing 
because of a toolchain bug or some other reasons? 

Cheers,

	Baozi