ref: 4b3e8958d8ebcdc53bf6deaa9cc927b6e1fceccf dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4