ref: 00c8bccaf6ceb1b7b1a8d09c19d4b33475cfb061 dir: /sys/src/libc/68000/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4