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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Mon, 10 Jun 2013, Julien Grall wrote:
> On 06/10/2013 01:13 AM, Chen Baozi wrote:
> 
> > 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@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
> > 
> > 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? 
> 
> __aeabi_uldivmod and co. are provided by libgcc.{so,a}. Mini-OS is not
> linked against this library.

Actually the implementation of __aeabi_uldivmod in
xen/arch/arm/arm32/lib/lib1funcs.S is GPLv2. You cannot use it in
Mini-OS that is BSD licensed. You need to find a BSD implementation of
that function.

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