ref: 42ec5a0729a73a383203ba969be07fc0b2ee8ecd dir: /sys/src/libc/arm64/main9.s/
TEXT _main(SB), 1, $0 SUB $16, SP MOV $setSB(SB), R28 MOV R0, _tos(SB) MOV $main(SB), R0 MOV $0, R30 B _callmain(SB)