ref: 0d7e3fd4a27a8494d8e513b43cac12b7d9b9dea6 dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4