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Re: [Qemu-devel] [PATCH 2/2] risu_ppc64le: distinguish real illegal inst
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From: |
Peter Maydell |
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Subject: |
Re: [Qemu-devel] [PATCH 2/2] risu_ppc64le: distinguish real illegal instruction |
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Date: |
Fri, 24 Feb 2017 16:03:33 +0000 |
On 13 February 2017 at 08:59, Nikunj A Dadhania
<address@hidden> wrote:
> While executing qemu_ppc64le, found an issue that the real illegal
> instructions are handled as risu_op which results in wrong info at the
> master end. Even the master needs to distinguish real illegal
> instructions versus risu_op.
>
> Signed-off-by: Nikunj A Dadhania <address@hidden>
No, this is deliberate. Otherwise you can't test illegal
instructions. What should happen is that both master and
apprentice ends end up in the default case, which does
a register info compare and continues having stepped the
PC past the illegal insn.
(If only one end thinks the insn is illegal then there will
be a register mismatch on the PC.)
thanks
-- PMM