From 7255ab59a59072a73da55a99ba0460dafc27500d Mon Sep 17 00:00:00 2001
From: Jeff Parsons <Jeff@pcjs.org>
Date: Tue, 4 Aug 2015 07:59:49 -0700
Subject: [PATCH] Fixed Debug exceptions that occur during REPeated
 instructions

---
 modules/pcjs/lib/x86func.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/modules/pcjs/lib/x86func.js b/modules/pcjs/lib/x86func.js
index 97cef61b4..4b71bb25c 100644
--- a/modules/pcjs/lib/x86func.js
+++ b/modules/pcjs/lib/x86func.js
@@ -3747,6 +3747,11 @@ X86.fnFault = function(nFault, nError, fHalt, nCycles)
     if (fDispatch) {
         this.nFault = nFault;
         X86.fnINT.call(this, nFault, nError, nCycles || 0);
+        /*
+         * REP'eated instructions that want to rewind regLIP to opLIP used to screw up this dispatch,
+         * so now we slip the new regLIP into opLIP, effectively turning their action into a no-op.
+         */
+        this.opLIP = this.regLIP;
     }
 
     /*
@@ -3841,7 +3846,7 @@ X86.fnFaultMessage = function(nFault, nError, fHalt)
             fHalt = false;
         }
     } else {
-        if (nFault == X86.EXCEPTION.NP_FAULT && bOpcode == 0x8E) {
+        if (MAXDEBUG && nFault == X86.EXCEPTION.NP_FAULT && bOpcode == 0x8E) {
             fHalt = true;
         }
     }