ref: 99ed32c9f5a5aaf6b32ebb49ce5c7045ffe7d0b0 dir: /sys/src/libc/68020/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4