ref: 79ff9d28bd2c3d447dfb1a7b3fb6ee5634145a7a dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4