ref: 5ed9ed2d70432e1d19229f3fa2f0d1d888c22ba9 dir: /sys/src/libc/power/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4