ref: 381da3192f22f6e4909f7a093776e91ba6a9f93b 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