ref: 2efaa1c5d93983daf4a4541a3c196bda4d4bb5fd dir: /sys/src/libc/power64/main9.s/
TEXT _main(SB), 1, $-8 ADD $-16, R1 MOVD $0, R0 MOVD $setSB(SB), R2 MOVD R3, _tos(SB) MOVD $main(SB), R3 MOVD R0, LR MOVD $_callmain(SB), R4 MOVD R4, CTR BR (CTR)