ref: 44e857152b38bcbfdd1d4c95bfe6e1fc4ad7ae69 dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4