ref: 445fc8e5a7ab20dc0613a6b1faedfe7f5183e7a9 dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4