ref: 2c8f291db2f04b4f87c01fcd3344c8d2fb1f8e89 dir: /sys/src/libc/power/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4