Re: [PATCH v2 8/8] tests/tcg: Add arm and aarch64 pc alignment tests

[Richard Henderson]

On 8/26/21 6:54 AM, Peter Maydell wrote:
> On Sat, 21 Aug 2021 at 21:09, Richard Henderson
> <richard.henderson@linaro.org> wrote:
>
> > +    /*
> > +     * From v8, it is CONSTRAINED UNPREDICTABLE whether BXWritePC aligns
> > +     * the address or not.  If so, we can legitimately fall through.
> > +     */
> > +    return EXIT_SUCCESS;
> > +}
>
> Can we get the test harness to run the test on a cortex-a9 guest CPU
> so we can avoid the UNPREDICTABLE and can always check the signal
> happened ? The test is a bit weak if it doesn't actually test that
> we take an exception...

Well, it'll always raise an exception under qemu.

I wrote it this way so that it would also always succeed when run on real hardware.  Even 
then, I have no specific knowledge of a cpu that does not raise an exception, but I only 
tested cortex-a57.


r~