ref: 0c1dd5754491b7d59b14a0dc6dbaa95ab3f18c8c dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4