ref: 8b98fda3f0bfb07bb7f3ed14f7fe9735f14d9db1 dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4