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Re: [Xen-devel] [PATCH] add canonical address checks to HVM
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] add canonical address checks to HVM |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Fri, 01 Dec 2006 10:12:12 +0000 |
| Delivery-date: | Fri, 01 Dec 2006 02:12:27 -0800 |
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| Thread-topic: | [Xen-devel] [PATCH] add canonical address checks to HVM |
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On 29/11/06 15:05, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: > +#ifdef __x86_64__ > +#define IS_CANO_ADDRESS(add) (((long)(add) >> 47) == ((long)(add) >> 63)) > +#else > +#define IS_CANO_ADDRESS(add) 1 > +#endif > + Is there any guarantee that right-shift is signed when using gcc? How about (int16_t)((add) >> 48) == -(int)(((add) >> 47) & 1) ?? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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