ref: 1cd199fbd188538a7eef7bcc68e8e8d5ef2c5d9f dir: /sys/src/libc/sparc/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4