ref: 43f2d5e7e0b8ca8d24e15fb4ff566827e5a5ae5b dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4