From 08ec3548af64930748137d1b4d6dcbb0ac5885ea Mon Sep 17 00:00:00 2001
From: hsc <hsc@8c4709b5-6ec9-48aa-a5cd-a96041d1645a>
Date: Wed, 6 Jun 2012 14:27:20 +0000
Subject: [PATCH] Bochs CPU fix: don't crash on weird memory accesses

Raising a GP exception may not be what a real x86 does, but it allows us
to catch this case in our experiments.

TODO: figure out correct reaction; backport to upstream

git-svn-id: https://www4.informatik.uni-erlangen.de/i4svn/danceos/trunk/devel/fail@1311 8c4709b5-6ec9-48aa-a5cd-a96041d1645a
---
 bochs/cpu/cpu.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/bochs/cpu/cpu.cc b/bochs/cpu/cpu.cc
index c0b9079c..810d0ca7 100644
--- a/bochs/cpu/cpu.cc
+++ b/bochs/cpu/cpu.cc
@@ -795,6 +795,9 @@ void BX_CPU_C::prefetch(void)
       else {
         BX_PANIC(("prefetch: getHostMemAddr vetoed direct read, pAddr=0x" FMT_PHY_ADDRX, pAddr));
       }
+      // DanceOS
+      // XXX how would this be handled on a real machine?
+      exception(BX_GP_EXCEPTION, 0);
     }
   }
 }