ref: 5fbc2ea9cebe4c4b1ab944a6d17efc73e0a8982c dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4