ref: 4e9f39a3ec0712542af0d035c79b3bf0eb2f2cd3 dir: /sys/src/libc/power/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4