ref: 0aa9e440f8c9e7b5f6bc7b215eccdf3ee9359c7e dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4