ref: d1eb16ee07c7a2cd85f91c4ee3ac23e87c8adf1a dir: /sys/src/libc/power/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4