[aandrejevic] 61204: [FAST486] Check for division by zero, and generate the appropriate exception.

Author: aandrejevic
Date: Tue Dec  3 00:56:47 2013
New Revision: 61204

URL: http://svn.reactos.org/svn/reactos?rev=61204&view=rev
Log:
[FAST486]
Check for division by zero, and generate the appropriate exception.


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

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] Tue Dec  3 00:56:47 2013
@@ -1012,8 +1012,17 @@
         /* DIV */
         case 6:
         {
-            UCHAR Quotient = State->GeneralRegs[FAST486_REG_EAX].LowWord / Value;
-            UCHAR Remainder = State->GeneralRegs[FAST486_REG_EAX].LowWord % Value;
+            UCHAR Quotient, Remainder;
+
+            if (Value == 0)
+            {
+                /* Divide error */
+                Fast486Exception(State, FAST486_EXCEPTION_DE);
+                return FALSE;
+            }
+
+            Quotient = State->GeneralRegs[FAST486_REG_EAX].LowWord / Value;
+            Remainder = State->GeneralRegs[FAST486_REG_EAX].LowWord % Value;
 
             /* Write back the results */
             State->GeneralRegs[FAST486_REG_EAX].LowByte = Quotient;
@@ -1025,8 +1034,17 @@
         /* IDIV */
         case 7:
         {
-            CHAR Quotient = (SHORT)State->GeneralRegs[FAST486_REG_EAX].LowWord /
(CHAR)Value;
-            CHAR Remainder = (SHORT)State->GeneralRegs[FAST486_REG_EAX].LowWord %
(CHAR)Value;
+            CHAR Quotient, Remainder;
+
+            if (Value == 0)
+            {
+                /* Divide error */
+                Fast486Exception(State, FAST486_EXCEPTION_DE);
+                return FALSE;
+            }
+
+            Quotient = (SHORT)State->GeneralRegs[FAST486_REG_EAX].LowWord /
(CHAR)Value;
+            Remainder = (SHORT)State->GeneralRegs[FAST486_REG_EAX].LowWord %
(CHAR)Value;
 
             /* Write back the results */
             State->GeneralRegs[FAST486_REG_EAX].LowByte = (UCHAR)Quotient;
@@ -1225,6 +1243,13 @@
         /* DIV */
         case 6:
         {
+            if (Value == 0)
+            {
+                /* Divide error */
+                Fast486Exception(State, FAST486_EXCEPTION_DE);
+                return FALSE;
+            }
+
             if (OperandSize)
             {
                 ULONGLONG Dividend =
(ULONGLONG)State->GeneralRegs[FAST486_REG_EAX].Long
@@ -1254,6 +1279,13 @@
         /* IDIV */
         case 7:
         {
+            if (Value == 0)
+            {
+                /* Divide error */
+                Fast486Exception(State, FAST486_EXCEPTION_DE);
+                return FALSE;
+            }
+
             if (OperandSize)
             {
                 LONGLONG Dividend =
(LONGLONG)State->GeneralRegs[FAST486_REG_EAX].Long