On Mon, 2011-09-12 at 10:25 +0530, Amit Mahajan wrote:
> On Mon, 2011-09-05 at 12:10 +0200, Norman Feske wrote:
> > Codezero expects the tool chain to be used for the kernel to not support
> > shared libraries. (this is the case for Codesourcery's arm-none-eabi
> > tool chain) Such tool chains use to incorporate both libgcc and
> > libgcc_eh into the single libgcc.a library. In contrast, for tool chains
> > built with '--enable-shared', libgcc does not contain the functions of
> > libgcc_eh. Hence, one symbol called '__aeabi_unwind_cpp_pr0' referenced
> > by libgcc and normally provided by libgcc_eh remains unresolved.
> >
> > There are two possible solutions for this problem: We could link
> > libgcc_eh to the 'final.elf' image as expected by libgcc. However, this
> > way, we will need to implement the the environment expected by
> > libgcc_eh. For Codezero, this is pointless because no C++ is used. The
> > second option is to provide a dummy symbol for '__aeabi_unwind_cpp_pr0'
> > just to make the linker happy. This patch adds such a dummy symbol to
> > 'loader/main.c'. (admittedly, 'main.c' is not the perfect location for
> > this symbol - so maybe we should provide the symbol in another way?)
> >
> > Using this patch, the kernel can be built with fully-fledged tool
> > chains. Consequently, the currently used two tool chains can then be
> > replaced by a single one.
>
> Ack.
>
> Looks good, but I think libc is a better place for this as that is used
> both by loader and userspace.
>
> Also, we one of our goal is to improve libc, so as the user can link
> with that only and use only none-eabi- toolchain for userapps too.
Seems like we already have it :) in newer codes.
amit@amit-laptop:~/Desktop/codezero/conts/userlibs/libc$ cat
src/arch-arm/eabi.c
/* Dummies to keep Codesourcery 4.1.1 libgcc division exceptions silent.
*/
void raise(void)
{
}
void __aeabi_unwind_cpp_pr0(void)
{
}
--
Thanks
Amit Mahajan
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