ref: 7aceac32e8fae763634f28cfccd9ce2356fccab5
dir: /sys/src/ape/lib/ap/power64/main9.s/
GLOBL _tos(SB), $8 TEXT _main(SB), 1, $-8 ADD $-16, R1 MOVD $0, R0 MOVD $setSB(SB), R2 MOVD R3, _tos(SB) MOVD $_apemain(SB), R3 MOVD R0, LR MOVD $_callmain(SB), R4 MOVD R4, CTR BR (CTR)