ref: b1e48a1ccb5a88af2b8e0ed599f31bb70dfa88cd dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4