ref: ceb77cedf2f3b72df2b5e7aedbf460252d1b0dcb dir: /sys/src/libc/power/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4