VMMAll

Timestamp:

Jul 18, 2013 12:37:06 AM (12 years ago)

Author:

vboxsync

Message:

Exploring conforming segments in BS2 test case.

File:

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

-              r46286
+              r47225
      * isn't necessarily equal if the segment is conforming.
      * See section 4.11.1 in the AMD manual.
+     *
+     * Update: Where the heck does it say CS.RPL can differ from CPL other than
+     *         right after real->prot mode switch and when in V8086 mode?  That
+     *         section says the RPL specified in a direct transfere (call, jmp,
+     *         ret) is not the one loaded into CS. Besides, if CS.RPL != CPL
+     *         it would be impossible for an exception handle or the iret
+     *         instruction to figure out whether SS:ESP are part of the frame
+     *         or not.  VBox or qemu bug must've lead to this misconception.
      */
     uint32_t uCpl;

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