ref: c7f0aba80b9f528ceb4f0d6be2bcf4519e5a59ae dir: /sys/src/libc/amd64/argv0.s/
GLOBL argv0(SB), $8 GLOBL _tos(SB), $8 GLOBL _privates(SB), $8 GLOBL _nprivates(SB), $4