ref: 78aec6d5c67cab79e03cdbe4f1a1bd7a7aa15612 dir: /sys/src/libc/power/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4