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Re: [Xen-devel] [PATCH 3/3] xen: arm: handle thumb mode guest in continuations

To: Ian Campbell <ian.campbell@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx
From: Julien Grall <julien.grall@xxxxxxxxxx>
Date: Wed, 25 Mar 2015 23:33:01 +0000
Cc: tim@xxxxxxx, stefano.stabellini@xxxxxxxxxxxxx
Delivery-date: Wed, 25 Mar 2015 23:33:24 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

Hi Ian,

On 25/03/2015 15:34, Ian Campbell wrote:

PC only needs adjusting by 2, otherwise we rerun the instruction prior
to the hvc as well.


I don't understand why you have to adjust PC by 2 for thumb.
The spec encodes the HVC thumb instruction on 32 bits (i.e 4 bytes).

Regards,


--
Julien Grall

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