[aandrejevic] 60146: [SOFT386] Implement JMP rel16/32

Author: aandrejevic
Date: Sun Sep 15 18:18:58 2013
New Revision: 60146

URL: http://svn.reactos.org/svn/reactos?rev=60146&view=rev
Log:
[SOFT386]
Implement JMP rel16/32

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

Modified: branches/ntvdm/lib/soft386/opcodes.c
URL: http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/soft386/opcodes.c?rev=...
==============================================================================
--- branches/ntvdm/lib/soft386/opcodes.c	[iso-8859-1] (original)
+++ branches/ntvdm/lib/soft386/opcodes.c	[iso-8859-1] Sun Sep 15 18:18:58 2013
@@ -4212,16 +4212,59 @@

SOFT386_OPCODE_HANDLER(Soft386OpcodeJmp)
 {
+    BOOLEAN Size = State->SegmentRegs[SOFT386_REG_CS].Size;
+
+    /* Make sure this is the right instruction */
+    ASSERT(Opcode == 0xE9);
+
+    if (State->PrefixFlags == SOFT386_PREFIX_OPSIZE)
+    {
+        /* The OPSIZE prefix toggles the size */
+        Size = !Size;
+    }
+    else if (State->PrefixFlags != 0)
+    {
+        /* Invalid prefix */
+        Soft386Exception(State, SOFT386_EXCEPTION_UD);
+        return FALSE;
+    }
+
+    if (Size)
+    {
+        LONG Offset = 0;
+
+        /* Fetch the offset */
+        if (!Soft386FetchDword(State, (PULONG)&Offset))
+        {
+            /* An exception occurred */
+            return FALSE;
+        }
+
+        /* Move the instruction pointer */        
+        State->InstPtr.Long += Offset;
+    }
+    else
+    {
+        SHORT Offset = 0;
+
+        /* Fetch the offset */
+        if (!Soft386FetchWord(State, (PUSHORT)&Offset))
+        {
+            /* An exception occurred */
+            return FALSE;
+        }
+
+        /* Move the instruction pointer */        
+        State->InstPtr.LowWord += Offset;
+    }
+
+    return TRUE;
+}
+
+SOFT386_OPCODE_HANDLER(Soft386OpcodeJmpAbs)
+{
     // TODO: NOT IMPLEMENTED
     UNIMPLEMENTED;

return FALSE;
 }
-
-SOFT386_OPCODE_HANDLER(Soft386OpcodeJmpAbs)
-{
-    // TODO: NOT IMPLEMENTED
-    UNIMPLEMENTED;
-
-    return FALSE;
-}