ref: 1d760c9b3ea8eb5d7d0484cb66527c6a9d4eb5ea dir: /sys/src/libc/power/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4