/usr/arm-linux-gnueabi/lib/libatomic.so.1 is in libatomic1-armel-cross 6.3.0-18cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/arm-linux-gnueabi/lib/libatomic.so.1.2.0
/usr/arm-linux-gnueabi/lib/libatomic.so.1.2.0