ref: 9482ba3dc7b2fc07e07b7ba08b7a07ffc8eca3c3 dir: /sys/src/libc/alpha/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4