Vijay Banerjee commented on a discussion on 
bsps/powerpc/shared/exceptions/ppc_exc.S: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1543#note_161458

 > -    mtlr    VECTOR_REGISTER
 > -    /* set upper bits to indicate that non-volatile
 > -     * registers should not be saved/restored.
 > -     */
 > -    li      VECTOR_REGISTER, 0xffff8000
 > -    /* compute vector into R3 */
 > -    rlwimi  VECTOR_REGISTER, FRAME_REGISTER, 24, 26, 31
 > -    /* we're now in almost the same state as if called by
 > -     * min_prolog_std but we must skip saving FRAME_REGISTER
 > -     * since that's done already
 > -     */
 > -    b       wrap_no_save_frame_register_std
 > -
 > -    .global __ppc_exc_wrappers_end
 > -__ppc_exc_wrappers_end = .
 > +PPC_EXC_MIN_PROLOG_SYNC _NAME = tmpl_std _VEC = 0 _PRI = std _FLVR = std

I attached a copy of my format files for reference

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1543#note_161458
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