ref: 85e6c2de891e6248bc4c5dc8a47ecf2c30f6b68e dir: /sys/src/libc/alpha/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4