https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114843
--- Comment #12 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Wilco from comment #10)
> Since the whole eh_return is an internal ABI in libgcc, a fix would be to
> change EH_RETURN_DATA_REGNO(N) to avoid x0 and x1. Since eh_return already
> reserves 7 registers(!) and now need to avoid using x0/x1 too, using x2-x5
> and x6,x7 and x9 for the other special registers should work.
You can't change EH_RETURN_DATA_REGNO now because it is not just internal ABI
to libgcc, it is part of libstdc++v3 too (libsupc++/eh_personality.cc):
/* For targets with pointers smaller than the word size, we must extend the
pointer, and this extension is target dependent. */
_Unwind_SetGR (context, __builtin_eh_return_data_regno (0),
__builtin_extend_pointer (ue_header));
_Unwind_SetGR (context, __builtin_eh_return_data_regno (1),
handler_switch_value);
And libobjc:
exception.c:#define __builtin_eh_return_data_regno(x) x
exception.c: _Unwind_SetGR (context, __builtin_eh_return_data_regno (0),
exception.c: _Unwind_SetGR (context, __builtin_eh_return_data_regno (1),
And really any exception personality.
