ref: d80cdf26e535edc0ceaa6ee8b0d5df8e1f98b5a7 dir: /sys/src/libc/sparc/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4