Coldfire 5282 TAS instruction code

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hi

I am developing a multitask application on a MFC5282 board and intended 
to create a semaphore type method to control access to some of the 
common variables.  Replacing the 'tst.b' with 'tas.b' in the snippet :
        move.l   4(%sp),%a0
        move.l   #128,%d0
        tas.b     (%a0)
        jbne     .L4
        move.b #-128,(%a0)
        clr.b      %d0
..L4:
        rts
causes a 'invalid instruction for the architecture ... ' during 
compilation with the m68k-uclinux-tools-20061214 tool set.

Can anybody suggest a way around the problem ?

Thanks

Phil Roets
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