[softwarelist] Re: DPScan + ARMini -> crash?
- From: "Ian Platt" <plattir@xxxxxxx>
- To: "davidpilling@xxxxxxxxxxxxx" <davidpilling@xxxxxxxxxxxxx>
- Date: Tue, 19 Jul 2011 18:09:22 +0000
On 19/7/2011, "David Pilling" <flist@xxxxxxxxxxxxxxxxxxx> wrote:
>Hi,
>
>In message <Iv2HtpCl6YIOFwAH@xxxxxxxxxxxxxxxxxxx>, David Pilling
><flist@xxxxxxxxxxxxxxxxxxx> writes
>>>> The crash occurs with the program counter pointing at the last
>>>> instruction below:
>
>>>> ADD R13,R13,#4
>
>>>> LDR R6,&0008FB24
>>>> LDR R5,&00090490
>
>>>> CMP R0,#0
>>>> BLT &00090480
>
>Once again Chris has done a test for me. I replaced the above code LDR
>R6, LDR R5 with:
>
> NOP ; <- changes start
> NOP
> LDR v3,[pc, #L0000b4-.-8]
> NOP
> NOP
> MOV v2,#&84
> ORR v2,v2,#&2D00
> ORR v2,v2,#&D0000
> NOP
> NOP
> NOP <- changes end
>
>The crash is the R5 load, which gets a constant address from memory.
>Instead of doing that I have put in the MOV, ORR, ORR sequence that
>loads the same value.
>
>The program now does not crash.
>
>Of course what I don't know is if adding the above words would have been
>enough to stop the error. In other words if memory alignment or offset
>values is the problem.
>
>If there are any users left reading this, the above is not a solution.
>
Oh yes! We're agog and thankful you're still on the case, David. :-)
Best wishes
Ian P.
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