ref: c6a9cbb0713c3ede52cf6822dcfc0589e5b9b8fe dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4