ref: ec73849b6936d839410ccb239d14b2f7c7ca3d6f dir: /sys/src/ape/lib/ap/arm64/main9.s/
GLOBL _tos(SB), $8 TEXT _main(SB), 1, $0 SUB $16, SP MOV $setSB(SB), R28 MOV R0, _tos(SB) MOV $_apemain(SB), R0 MOV $0, R30 B _callmain(SB)