ref: b6f7ca0fff656c68fc98dfd2a1eeec0ea5ff7b0f dir: /sys/src/libc/power/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4