ref: 435a0f18d5a5f372b4d5a30953e8d6bfd9cf6d17 dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4