ref: a0a3bf21bc9fce5a0b2bdb435524ed1a7b334d0d dir: /sys/src/libc/68020/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4