ref: 7573be34a581b4cbb9196b08ede74738d65bcb0e dir: /sys/src/libc/amd64/main9.s/
TEXT _main(SB), 1, $0 MOVQ AX, _tos(SB) MOVQ $main(SB), RARG PUSHQ RARG PUSHQ $0 MOVQ $_callmain(SB), AX JMP* AX