[ion] 25976: - Fix another typo in CommonDispatchException (with yet another critical flaw as a result). Sometimes, exceptions would incorrectly be detected as coming from user-mode even though CS was kernel mode. When creating the KTRAP_FRAME, the kernel would then add the Ring 3 RPL_MASK (3) (because it believed we're in usermode) to the kernel-mode CS, creating the invalid CS of 0xB, which would lead into a GPF during the iretd. - Re-enable DebugPrint since this now works.

Author: ion
Date: Sat Mar  3 22:49:36 2007
New Revision: 25976

URL: http://svn.reactos.org/svn/reactos?rev=25976&view=rev
Log:
- Fix another typo in CommonDispatchException (with yet another critical flaw as a
result). Sometimes, exceptions would incorrectly be detected as coming from user-mode even
though CS was kernel mode. When creating the KTRAP_FRAME, the kernel would then add the
Ring 3 RPL_MASK (3) (because it believed we're in usermode) to the kernel-mode CS,
creating the invalid CS of 0xB, which would lead into a GPF during the iretd.
- Re-enable DebugPrint since this now works.

Modified:
    trunk/reactos/lib/rtl/debug.c
    trunk/reactos/ntoskrnl/kd/kdmain.c
    trunk/reactos/ntoskrnl/ke/i386/trap.s

Modified: trunk/reactos/lib/rtl/debug.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/rtl/debug.c?rev=25976&…
==============================================================================
--- trunk/reactos/lib/rtl/debug.c (original)
+++ trunk/reactos/lib/rtl/debug.c Sat Mar  3 22:49:36 2007
@@ -23,7 +23,6 @@
            IN ULONG Level)
 {
     /* Call the INT2D Service */
-    return STATUS_SUCCESS;
     return DebugService(BREAKPOINT_PRINT,
                         DebugString->Buffer,
                         DebugString->Length,

Modified: trunk/reactos/ntoskrnl/kd/kdmain.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/kd/kdmain.c?rev=2…
==============================================================================
--- trunk/reactos/ntoskrnl/kd/kdmain.c (original)
+++ trunk/reactos/ntoskrnl/kd/kdmain.c Sat Mar  3 22:49:36 2007
@@ -127,6 +127,7 @@
 
         /* This we can handle: simply bump EIP */
         Context->Eip++;
+        return TRUE;
     }
 
     /* Get out of here if the Debugger isn't connected */

Modified: trunk/reactos/ntoskrnl/ke/i386/trap.s
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/i386/trap.s?re…
==============================================================================
--- trunk/reactos/ntoskrnl/ke/i386/trap.s (original)
+++ trunk/reactos/ntoskrnl/ke/i386/trap.s Sat Mar  3 22:49:36 2007
@@ -604,7 +604,7 @@
 
     /* Set the record in ECX and check if this was V86 */
     mov ecx, esp
-    test dword ptr [esp+KTRAP_FRAME_EFLAGS], EFLAGS_V86_MASK
+    test dword ptr [ebp+KTRAP_FRAME_EFLAGS], EFLAGS_V86_MASK
     jz SetPreviousMode
 
     /* Set V86 mode */
@@ -791,6 +791,7 @@
     sti
 
 PrepInt3:
+
     /* Prepare the exception */
     mov esi, ecx
     mov edi, edx