ref: f5688dd6c9bfb6cee00f2c5e5f190d7a2ffaa6c6 dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4