ref: 3866717cbb020199d58171c1c0cdd7382a74ee82 dir: purgatorio/libkern/getfcr-thumb.s
TEXT setfcr(SB), $0 RET TEXT getfcr(SB), $0 RET TEXT getfsr(SB), $0 RET TEXT setfsr(SB), $0 RET