Changeset 65304 in vbox

Timestamp:

Jan 16, 2017 7:59:38 AM (8 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

112875

Message:

IEM: 286 only needs to fetch 6 bytes of descriptors.

File:

• trunk/src/VBox/VMM/VMMAll/IEMAll.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMAll/IEMAll.cpp

@@ -10255 +10255 @@
      * required.
      */
-    VBOXSTRICTRC rcStrict = iemMemFetchSysU64(pVCpu, &pDesc->Legacy.u, UINT8_MAX, GCPtrBase + (uSel & X86_SEL_MASK));
+    VBOXSTRICTRC rcStrict;
+    if (IEM_GET_TARGET_CPU(pVCpu) > IEMTARGETCPU_286)
+        rcStrict = iemMemFetchSysU64(pVCpu, &pDesc->Legacy.u, UINT8_MAX, GCPtrBase + (uSel & X86_SEL_MASK));
+    else
+    {
+        rcStrict = iemMemFetchSysU16(pVCpu, &pDesc->Legacy.au16[0], UINT8_MAX, GCPtrBase + (uSel & X86_SEL_MASK) + 0);
+        if (rcStrict != VINF_SUCCESS)
+            return rcStrict;
+        rcStrict = iemMemFetchSysU16(pVCpu, &pDesc->Legacy.au16[1], UINT8_MAX, GCPtrBase + (uSel & X86_SEL_MASK) + 2);
+        if (rcStrict != VINF_SUCCESS)
+            return rcStrict;
+        rcStrict = iemMemFetchSysU16(pVCpu, &pDesc->Legacy.au16[2], UINT8_MAX, GCPtrBase + (uSel & X86_SEL_MASK) + 4);
+    }
+
     if (rcStrict == VINF_SUCCESS)
     {