ref: 94443daf8e248e65afc8d3f17f26efea22748b51 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