ref: 75c92428225428c8fde2d015f010e608a0b12f1d dir: purgatorio/libkern/getfcr-arm.s
TEXT setfcr(SB), $0 RET TEXT getfcr(SB), $0 RET TEXT getfsr(SB), $0 RET TEXT setfsr(SB), $0 RET