ref: 6ab5d4fca4a4b628e7cefa6f095f8c9e76cde0c6 dir: /sys/src/libc/power/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4