[PATCH] libc++abi: Don't push the unwind_exception to r12 in _gxx_personality_v0.

[Jonathan Roelofs]

On 5/28/14, 9:08 AM, Dana Jansens wrote:
> -    // Copy the address of _Unwind_Control_Block to r12 so that _Unwind_GetLangauageSpecificData()
> -    // and _Unwind_GetRegionStart() can return correct address.
> -    _Unwind_SetGR(context, REG_UCB, reinterpret_cast<uint32_t>(unwind_exception));

libgcc does in fact need us to pass the UCB in r12. See: 
gcc-trunk-4.8/libgcc/arm/pr-support.c.

We should probably keep this, but put it under LIBCXXABI_USE_GLIBC for when 
using libgcc's unwinder with libc++abi, as our unwinder implementation doesn't 
do it that way.

Cheers,
Jon

-- 
Jon Roelofs
jonathan at codesourcery.com
CodeSourcery / Mentor Embedded