exc_state        3802 gc/os_dep.c            ppc_exception_state_t exc_state;
exc_state        3806 gc/os_dep.c            ppc_exception_state64_t exc_state;
exc_state        3825 gc/os_dep.c            (natural_t*)&exc_state,&exc_state_count);
exc_state        3839 gc/os_dep.c        addr = (char*) exc_state.dar;