ref: d8b8993a8914c0fb4ed9bd60bdb0f85d0ce2e497 dir: /sys/src/libc/power/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4