fix source operand decoding for 8bit mov[zs]x instructions

PATCH New Gleb Natapov 1 participant 1 message Apr 24, 2013

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Stable branch x86 KVM KVM x86

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Gleb Natapov

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2013-04-24 10:38 UTC #0 lore raw

PATCH 1/1 fix source operand decoding for 8bit mov[zs]x instructions

Source operand for one byte mov[zs]x is decoded incorrectly if it is in high byte register. Fix that.

Cc [email protected]

Signed-off-by Gleb Natapov <[email protected]>

arch/x86/kvm/emulate.c +4 -0

index 46f63b8..8e517bb 100644
@@ -4172,6 +4172,10 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
 		break;
 	case OpMem8:
 		ctxt->memop.bytes = 1;
+		if (ctxt->memop.type == OP_REG) {
+			ctxt->memop.addr.reg = decode_register(ctxt, ctxt->modrm_rm, 1);
+			fetch_register_operand(&ctxt->memop);
+		}
 		goto mem_common;
 	case OpMem16:
 		ctxt->memop.bytes = 2;

--
Gleb.