ref: cdaa7b899f874f4e0e6c8a04dcf6a5a3a7dfafdf dir: /sys/src/libc/alpha/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4