ref: 3a0d5f41a8253b4a3fbb6ae4b6ca77789fd6ae83 dir: /sys/src/libc/arm64/argv0.s/
GLOBL argv0(SB), $8 GLOBL _tos(SB), $8 GLOBL _privates(SB), $8 GLOBL _nprivates(SB), $4