ref: e21a26c2282e4e153559b6d1cd8a1ec6ab8b2c2b dir: /sys/src/libc/sparc/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4