[ion] 20914: Disable correct usage of ESP0 since it seems the V86 code is still not ready to handle that. This should fix the V86 exceptions some people have been having.

Disable correct usage of ESP0 since it seems the V86 code is still not
ready to handle that. This should fix the V86 exceptions some people
have been having.
Modified: trunk/reactos/ntoskrnl/ke/i386/ctxswitch.S
Modified: trunk/reactos/ntoskrnl/ke/i386/thread.c
  _____

Modified: trunk/reactos/ntoskrnl/ke/i386/ctxswitch.S
--- trunk/reactos/ntoskrnl/ke/i386/ctxswitch.S	2006-01-16 16:45:27 UTC
(rev 20913)
+++ trunk/reactos/ntoskrnl/ke/i386/ctxswitch.S	2006-01-16 17:05:50 UTC
(rev 20914)
@@ -171,8 +171,11 @@

NoAdjust:

/* Set new ESP0 */
-    mov [ebp+KTSS_ESP0], eax
+    //mov [ebp+KTSS_ESP0], eax

+    /* Save it */
+    push [ebp+KTSS_ESP0]
+
     /* Set TEB pointer */
     mov eax, [esi+KTHREAD_TEB]
     mov [ebx+KPCR_TEB], eax
@@ -257,6 +260,9 @@
     mov cr0, eax
 4:

+    /* Restore ESP0 */
+    pop [ebp+KTSS_ESP0]
+
     /* Restore exception list */
     pop [ebx+KPCR_EXCEPTION_LIST]

_____

Modified: trunk/reactos/ntoskrnl/ke/i386/thread.c
--- trunk/reactos/ntoskrnl/ke/i386/thread.c	2006-01-16 16:45:27 UTC
(rev 20913)
+++ trunk/reactos/ntoskrnl/ke/i386/thread.c	2006-01-16 17:05:50 UTC
(rev 20914)
@@ -14,6 +14,7 @@

typedef struct _KSHARED_CTXSWITCH_FRAME
 {
+    ULONG Esp0;
     PVOID ExceptionList;
     PVOID RetEip;
 } KSHARED_CTXSWITCH_FRAME, *PKSHARED_CTXSWITCH_FRAME;
@@ -231,6 +232,9 @@

/* And set up the Context Switch Frame */
     CtxSwitchFrame->RetEip = KiThreadStartup;
+    CtxSwitchFrame->Esp0 = (ULONG_PTR)Thread->InitialStack -
+                                      sizeof(FX_SAVE_AREA) -
+                                      0x10;
     CtxSwitchFrame->ExceptionList = (PVOID)0xFFFFFFFF;

/* Save back the new value of the kernel stack. */