ref: 5ba95fdb07ddc2c32111a1b2f57f17aa27fcbbf5 dir: /sys/src/libc/alpha/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4