ref: 70e2b4f7ec6b225ae69a6e76dd025e1be0e0e8b1 dir: /sys/src/libc/arm64/argv0.s/
GLOBL argv0(SB), $8 GLOBL _tos(SB), $8 GLOBL _privates(SB), $8 GLOBL _nprivates(SB), $4