ref: af6f6d5ec4b7b80e1c0d86a65dc4f9fd85182ec2 dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4