ref: 6b8bae6a7e94bbbfb15f8c344ac5beee0bc08eda dir: /sys/src/libc/power/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4