ref: e0e2e9d81b4dbdabb7521dcc68e9f980f26cc3a9 dir: /sys/src/libc/arm/argv0.s/
GLOBL argv0(SB), $4 GLOBL _tos(SB), $4 GLOBL _privates(SB), $4 GLOBL _nprivates(SB), $4