ref: 7b5bcd7b63738bbbf210e2d9cbe3ec75f68687b7 dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4