ref: 2f6c3ee3bcdfd540eb0d0bf8ce90a2a97e1f3850 dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4