Changeset 9704 in vbox for trunk/src/VBox

Timestamp:

Jun 16, 2008 9:08:21 AM (17 years ago)

Author:

vboxsync

Message:

No limit checks in 64 bits mode

File:

• trunk/src/VBox/VMM/DBGFDisas.cpp (modified) (3 diffs)

trunk/src/VBox/VMM/DBGFDisas.cpp

@@ -75 +75 @@
     /** Whether the PageMapLock is valid or not. */
     bool            fLocked;
+    /** 64 bits mode or not. */
+    bool            f64Bits;
 } DBGFDISASSTATE, *PDBGFDISASSTATE;
 
@@ -99 +101 @@
     pState->pVM             = pVM;
     pState->fLocked         = false;
+    pState->f64Bits         = enmMode >= PGMMODE_AMD64 && pSelInfo->Raw.Gen.u1Long;
     Assert((uintptr_t)GCPtr == GCPtr);
     uint32_t cbInstr;
     int rc = DISCoreOneEx(GCPtr,
-                          enmMode >= PGMMODE_AMD64 && pSelInfo->Raw.Gen.u1Long
+                          pState->f64Bits
                           ? CPUMODE_64BIT
                           : pSelInfo->Raw.Gen.u1DefBig
@@ -215 +218 @@
 
         /* check the segemnt limit */
-        if (PtrSrc > pState->cbSegLimit)
+        if (!pState->f64Bits && PtrSrc > pState->cbSegLimit)
             return VERR_OUT_OF_SELECTOR_BOUNDS;
 
         /* calc how much we can read */
         uint32_t cb = PAGE_SIZE - (GCPtr & PAGE_OFFSET_MASK);
-        RTGCUINTPTR cbSeg = pState->GCPtrSegEnd - GCPtr;
-        if (cb > cbSeg && cbSeg)
-            cb = cbSeg;
+        if (!pState->f64Bits)
+        {
+            RTGCUINTPTR cbSeg = pState->GCPtrSegEnd - GCPtr;
+            if (cb > cbSeg && cbSeg)
+                cb = cbSeg;
+        }
         if (cb > cbRead)
             cb = cbRead;