Re: [PATCH] target/arm: Make Thumb store insns UNDEF for Rn==1111

[Richard Henderson]

On 4/8/21 9:24 AM, Peter Maydell wrote:
> The Arm ARM specifies that for Thumb encodings of the various plain
> store insns, if the Rn field is 1111 then we must UNDEF.  This is
> different from the Arm encodings, where this case is either
> UNPREDICTABLE or has well-defined behaviour.  The exclusive stores,
> store-release and STRD do not have this UNDEF case for any encoding.
>
> Enforce the UNDEF for this case in the Thumb plain store insns.
>
> Fixes:https://bugs.launchpad.net/qemu/+bug/1922887
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/translate.c | 16 ++++++++++++++++
>   1 file changed, 16 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~