ref: 5f68df8fbb0e90f1657c0bd9bbc1b12e62fe4edd dir: /sys/src/libc/386/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4