This library is thoroughly documented in this document http://www.freescale.com/files/32bit/doc/ref_manual/DSPLIBUM.pdf:
Digital Signal Processing Libraries
Using the ColdFire® eMAC and MAC
... but I cannot find the accompanying library file anywhere. The closest that I can get is this page: CFDSPLIB: Complimentary ColdFire Digital Signal Processing Library which also has no download. It appears that you set up your high/low/band pass filter parameters here, and then download an XML file which mentions signal processing .c and .h files, but the files are not provided. Also, this page only has band pass/stop filters, whereas the library I am looking for has FFT, FIR and IIR.
Does anyone have a link to download these files?