ref: 5e201a7d2e619fe8f5f23d3a2e30638ac8c50ee9 dir: /sys/src/libc/mips/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4