/usr/bin/mips64el-linux-gnuabi64-gcov-tool is in gcc-mips64el-linux-gnuabi64 4:6.3.0-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/mips64el-linux-gnuabi64-gcov-tool-6
/usr/bin/mips64el-linux-gnuabi64-gcov-tool-6