ref: 5fc2f6af6c9d938dca7dd4b8df061d9eeb87ec75 dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4