ref: 65bd53b9b89b0a84d0f16db4adc3f53fa6ab3a3a dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4