ref: a3bbc2c153dca2a4125a834a3f8d44a8c000c5c0 dir: /sys/src/libc/power/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4