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[microblaze-uclinux] newbie question - KSP in entry.S



We are using uClinux (2.4.32-uc0) on a Microblaze processor here and am hunting down a problem.  In doing so, I am looking at entry.S and have a question how KSP is used.  It is first set in head.S and is read in SAVE_STATE and written in RETURN.  On the surface one would assume that KSP would maintain a value close to its original value (+- SAVE_SIZE) but I see it changing greatly.  Could somebody enlighten me on what I am missing on the usage of KSP in 2.4? 

 

Thanks

Gary