ref: e80c7eb50b65ff7bc864fe551c24ac26c15f3e8d 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