Re: [Xen-devel] [PATCH 19/34] xen/arm: Provide eabi wrapper for __aeabi_mem* functions

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Ian,

On 03/25/2014 05:25 PM, Ian Campbell wrote:
> On Tue, 2014-03-25 at 16:55 +0000, Julien Grall wrote:
>> Clang doesn't provide function __aebai_mem*, implement generically as a 
>> wrapper
>> for mem* function provided by Xen.
> 
> Where are the references to these functions coming from if not from the
> compiler?

Theses functions are called by the code generated by the compiler.
Removing this file will result to the following errors:

/local/home/julien/works/arndale/xen/xen/common/symbols-dummy.o -o 
/local/home/julien/works/arndale/xen/xen/.xen-syms.0
prelink.o: In function `dump_node':
/local/home/julien/works/arndale/xen/xen/common/device_tree.c:259: undefined 
reference to `__aeabi_memset'
prelink.o: In function `get_cpu_idle_time':
/local/home/julien/works/arndale/xen/xen/common/schedule.c:178: undefined 
reference to `__aeabi_memset'
prelink.o: In function `construct_dom0':
/local/home/julien/works/arndale/xen/xen/arch/arm/domain_build.c:1055: 
undefined reference to `__aeabi_memset'
prelink.o: In function `wallclock_time':
/local/home/julien/works/arndale/xen/xen/arch/arm/time.c:267: undefined 
reference to `__aeabi_memset'
prelink.o: In function `scheduler_init':
/local/home/julien/works/arndale/xen/xen/common/schedule.c:1368: undefined 
reference to `__aeabi_memcpy'
/local/home/julien/works/arndale/xen/xen/common/schedule.c:1377: undefined 
reference to `__aeabi_memcpy'

 
> Are you sure this isn't something usually provided by some clang
> equivalent of libgcc?

Yes. Linux on LLVM has the same issue. See page 22:
https://events.linuxfoundation.org/images/stories/pdf/lcjp2012_charlebois.pdf?a

Regards,

-- 
Julien Grall

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