ref: 0060a4a2bc0d1554c8a04a15eb096e5a2bce4dcd dir: /sys/src/libc/68000/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4