ref: c2b0f9aa695406f0319fa1cb98b7bb7b5dbd7e02 dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4