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Re: pxa crashes with qemu v5.2 when executing xscale operations
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From: |
Peter Maydell |
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Subject: |
Re: pxa crashes with qemu v5.2 when executing xscale operations |
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Date: |
Fri, 8 Jan 2021 20:00:27 +0000 |
On Mon, 21 Dec 2020 at 15:24, Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
> On 12/21/20 6:28 AM, Guenter Roeck wrote:
> > 84: ec432000 mar acc0, r2, r3
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >
> > This is supposed to be a DSP or iWMMXt coprocessor instruction.
> > I did notice that the code to support xscale instructions has changed
> > significantly
> > in qemu v5.2.
>
> Indeed a lot changed...
>
> I had a quick look. The instruction is decoded in aa32 as LDR_ri.
It isn't, incidentally. LDR_ri has 010 in bits [27:25], and this
insn has 110.
thanks
-- PMM