ref: ad7120b2e2f0ed0d226eec1b5ef6fc6b3eebb4ef dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4