ref: 5a51e900dd113a1a5f2d2a0e8bac067fbc7da3ae dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4