ref: 9ed0dd3a7fc2e9242af1e17bc9fda7f6e97063f1 dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4