ref: 2c5dfc8dbd6cf36adedf1b4be35e49f8a8d5f3cf dir: /sys/src/libc/arm/getfcr.s/
TEXT setfcr(SB), $0 RET TEXT getfcr(SB), $0 RET TEXT getfsr(SB), $0 RET TEXT setfsr(SB), $0 RET