ref: ae61eb9381f6b0c70e1c52bf2c2b7f4cd0b5bb6f dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4