ref: 0ef3bdaaa4a3997a5e7ff2c484a2cf8edcfc49f4 dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4