ref: 17a9a0291b51a6f1bf84e8ee5fdb2f46db8519bb dir: /sys/src/libc/68000/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4