ref: 9b2ba485f6c586b23ed4e409ad9c7ea6d0c654ac dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4