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Re: [Qemu-arm] [Qemu-devel] [PATCH 3/6] target/arm: v8M: Check state of

From: Richard Henderson
Subject: Re: [Qemu-arm] [Qemu-devel] [PATCH 3/6] target/arm: v8M: Check state of exception being returned from
Date: Mon, 17 Jun 2019 12:58:24 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0

On 6/17/19 10:53 AM, Peter Maydell wrote:
> In v8M, an attempt to return from an exception which is not
> active is an illegal exception return. For this purpose,
> exceptions which can configurably target either Secure or
> NonSecure are not considered to be active if they are
> configured for the opposite security state for the one
> we're trying to return from (eg attempt to return from
> an NS NMI but NMI targets Secure). In the pseudocode this
> is handled by IsActiveForState().
> Detect this case rather than counting an active exception
> possibly of the wrong security state as being sufficient.
> Signed-off-by: Peter Maydell <address@hidden>
> ---
>  hw/intc/armv7m_nvic.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)

Reviewed-by: Richard Henderson <address@hidden>


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