[aandrejevic] 60694: [SOFT386] Fix typecasts to make sure the value is sign-extended.

Author: aandrejevic
Date: Fri Oct 18 21:45:10 2013
New Revision: 60694

URL: http://svn.reactos.org/svn/reactos?rev=60694&view=rev
Log:
[SOFT386]
Fix typecasts to make sure the value is sign-extended.

Modified:
    branches/ntvdm/lib/soft386/opgroups.c

Modified: branches/ntvdm/lib/soft386/opgroups.c
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/soft386/opgroups.c?rev...
==============================================================================
--- branches/ntvdm/lib/soft386/opgroups.c	[iso-8859-1] (original)
+++ branches/ntvdm/lib/soft386/opgroups.c	[iso-8859-1] Fri Oct 18 21:45:10 2013
@@ -988,7 +988,7 @@

SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupF6)
 {
-    UCHAR Dummy, Value;
+    UCHAR Dummy, Value = 0;
     SOFT386_MOD_REG_RM ModRegRm;
     BOOLEAN AddressSize = State->SegmentRegs[SOFT386_REG_CS].Size;

@@ -1081,7 +1081,7 @@
         /* IMUL */
         case 5:
         {
-            SHORT Result = (SHORT)Value * (SHORT)State->GeneralRegs[SOFT386_REG_EAX].LowByte;
+            SHORT Result = (SHORT)((CHAR)Value) * (SHORT)((CHAR)State->GeneralRegs[SOFT386_REG_EAX].LowByte);

/* Update the flags */
             State->Flags.Cf = State->Flags.Of =
@@ -1125,7 +1125,7 @@

SOFT386_OPCODE_HANDLER(Soft386OpcodeGroupF7)
 {
-    ULONG Dummy, Value, SignFlag;
+    ULONG Dummy, Value = 0, SignFlag;
     SOFT386_MOD_REG_RM ModRegRm;
     BOOLEAN OperandSize, AddressSize;

@@ -1292,7 +1292,7 @@
         {
             if (OperandSize)
             {
-                LONGLONG Result = (LONGLONG)Value * (LONGLONG)State->GeneralRegs[SOFT386_REG_EAX].Long;
+                LONGLONG Result = (LONGLONG)((LONG)Value) * (LONGLONG)((LONG)State->GeneralRegs[SOFT386_REG_EAX].Long);

/* Update the flags */
                 State->Flags.Cf = State->Flags.Of =
@@ -1304,7 +1304,7 @@
             }
             else
             {
-                LONG Result = (LONG)Value * (LONG)State->GeneralRegs[SOFT386_REG_EAX].LowWord;
+                LONG Result = (LONG)Value * (LONG)((SHORT)State->GeneralRegs[SOFT386_REG_EAX].LowWord);

/* Update the flags */
                 State->Flags.Cf = State->Flags.Of =
@@ -1365,8 +1365,8 @@
             {
                 LONG Dividend = (LONG)State->GeneralRegs[SOFT386_REG_EAX].LowWord
                                  | ((LONG)State->GeneralRegs[SOFT386_REG_EDX].LowWord << 16);
-                SHORT Quotient = Dividend / (SHORT)Value;
-                SHORT Remainder = Dividend % (SHORT)Value;
+                SHORT Quotient = Dividend / (SHORT)LOWORD(Value);
+                SHORT Remainder = Dividend % (SHORT)LOWORD(Value);

/* Write back the results */
                 State->GeneralRegs[SOFT386_REG_EAX].LowWord = (USHORT)Quotient;