带有SqlServer存储过程的PHP PDO不会返回所有数据

SP_REPORT_HOME \'param1\',\'param2\',1

public function getReport($empresa1, $empresa2, $num) {
    $ds = $this->connection->prepare(\'SP_REPORT_HOME ?,?,?\');
    $ds->bindParam(1, $empresa1, PDO::PARAM_STR, 4);
    $ds->bindParam(2, $empresa2, PDO::PARAM_STR, 4);
    $ds->bindParam(3, $num, PDO::PARAM_INT, 4);
    $ds->execute(); 
    return $ds->fetchAll();
}

$this->connection = new PDO(
        \"dblib:host=IP:PORT;dbname=DBNAME\", 
        \"LOGIN\", 
        \"PASS\"
    );