ref: 5b5eb3b4b4a7e10e16dcbe7f287771c7e6e85aa8 dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4