Coldfire 5282 TAS instruction code

[Phil Roets]

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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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[Greg Ungerer]

Hi Phil,

Phil Roets wrote:

> 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 ?

What CPU specifier option did you pass to gcc?

 From memory you need a -m528x with that compiler.

Regards
Greg


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