ELF_NEVRREG
ELF_NEVRREG * sizeof(u32), failed);
(u32 __user *)&frame->mc_vregs + ELF_NEVRREG, failed);
BUILD_BUG_ON(sizeof(current->thread.spe) != ELF_NEVRREG * sizeof(u32));
unsafe_get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG, failed);