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RE: [Xen-devel] hvm_decode() questions
| To: | "Jan Beulich" <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] hvm_decode() questions |
| From: | "Li, Xin B" <xin.b.li@xxxxxxxxx> |
| Date: | Fri, 24 Nov 2006 22:07:05 +0800 |
| Delivery-date: | Fri, 24 Nov 2006 06:07:18 -0800 |
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| Thread-index: | AccP0UBHCEAjTLwORv2rDuS/c6B3wAAAFShQ |
| Thread-topic: | [Xen-devel] hvm_decode() questions |
>1) single-byte opcode 0x87 (xchg): What is this strange conditional > > if ( ((*(opcode+1)) & 0xc7) == 5 ) > >supposed to address? xchg has absolutely symmetric operands. > >2) two-byte opcode 0xB7 (movzx): What is this dependency on rex >bit 3 doing here? Apparently this was based on Intel's (broken) >documentation - the source operand is always 16 bits. > >Unless someone can explain these, I'll send a patch to remove them. I agree that hvm_decode needs a careful review. -Xin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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