ref: 9f6967ed7e12ec3254bc1b3b7ad3e5a41c274e3a dir: /sys/src/libc/68020/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4