[hbelusca] 62258: [FAST486] - When pushing 16-bit value, check only low word of ESP (i.e. SP). - Don't forget to clear high word of EIP, for the Jump instruction of group 4 (0xFF).

Author: hbelusca
Date: Wed Feb 19 20:24:53 2014
New Revision: 62258

URL: http://svn.reactos.org/svn/reactos?rev=62258&view=rev
Log:
[FAST486]
- When pushing 16-bit value, check only low word of ESP (i.e. SP).
- Don't forget to clear high word of EIP, for the Jump instruction of group 4 (0xFF).

Modified:
    branches/ntvdm/lib/fast486/common.inl
    branches/ntvdm/lib/fast486/opgroups.c

Modified: branches/ntvdm/lib/fast486/common.inl
URL:
http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/fast486/common.inl?re…
==============================================================================
--- branches/ntvdm/lib/fast486/common.inl	[iso-8859-1] (original)
+++ branches/ntvdm/lib/fast486/common.inl	[iso-8859-1] Wed Feb 19 20:24:53 2014
@@ -296,7 +296,7 @@
         USHORT ShortValue = LOWORD(Value);
 
         /* Check if SP is 1 */
-        if (State->GeneralRegs[FAST486_REG_ESP].Long == 1)
+        if (State->GeneralRegs[FAST486_REG_ESP].LowWord == 1)
         {
             Fast486Exception(State, FAST486_EXCEPTION_SS);
             return FALSE;

Modified: branches/ntvdm/lib/fast486/opgroups.c
URL:
http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/fast486/opgroups.c?re…
==============================================================================
--- branches/ntvdm/lib/fast486/opgroups.c	[iso-8859-1] (original)
+++ branches/ntvdm/lib/fast486/opgroups.c	[iso-8859-1] Wed Feb 19 20:24:53 2014
@@ -1632,6 +1632,9 @@
         {
             /* Set the IP to the address */
             State->InstPtr.LowWord = Value;
+
+            /* Clear the top half of EIP */
+            State->InstPtr.Long &= 0xFFFF;
         }
         else if (ModRegRm.Register == 5)
         {