From a7ff891008b7c7320819333d5f0b7837e0b11d1b Mon Sep 17 00:00:00 2001
From: Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
Date: Mon, 12 Apr 2010 23:51:36 +0300
Subject: [PATCH] Report #NP if segment (O16 A16 CALL FAR) is not present

This allows Jazz Jackrabbit to get to GFX mode switch.
---
 org/jpc/emulator/memory/codeblock/optimised/ProtectedModeUBlock.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/org/jpc/emulator/memory/codeblock/optimised/ProtectedModeUBlock.java b/org/jpc/emulator/memory/codeblock/optimised/ProtectedModeUBlock.java
index 64dea49..2ea0172 100644
--- a/org/jpc/emulator/memory/codeblock/optimised/ProtectedModeUBlock.java
+++ b/org/jpc/emulator/memory/codeblock/optimised/ProtectedModeUBlock.java
@@ -4841,6 +4841,9 @@ System.err.println("Accessed LDT selector global byte 5:" + cpu.readSupervisorBy
             case 0x1a: // Non-conforming Code Segment
             case 0x1b: // Non-conforming Code Segment
                 {
+                    if(!newSegment.isPresent())
+                        throw new ProcessorException(ProcessorException.Type.NOT_PRESENT, newSegment.getSelector(), true);
+
                     if ((cpu.esp < 4) && (cpu.esp > 0))
                         throw ProcessorException.STACK_SEGMENT_0;
 
-- 
2.11.4.GIT