From 5943f0fc84ba51d8341a97437b798225fd36da56 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Wed, 2 Jun 2010 12:58:11 -0500
Subject: [PATCH] ARM: Ignore writing a bad mode to CPSR with MSR.

---
 src/arch/arm/insts/static_inst.hh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/arch/arm/insts/static_inst.hh b/src/arch/arm/insts/static_inst.hh
index c26053cef..33453bec6 100644
--- a/src/arch/arm/insts/static_inst.hh
+++ b/src/arch/arm/insts/static_inst.hh
@@ -177,7 +177,11 @@ class ArmStaticInst : public StaticInst
         if (bits(byteMask, 0)) {
             if (privileged) {
                 bitMask = bitMask | mask(7, 6);
-                bitMask = bitMask | mask(5);
+                if (!badMode((OperatingMode)(val & mask(5)))) {
+                    bitMask = bitMask | mask(5);
+                } else {
+                    warn_once("Ignoring write of bad mode to CPSR.\n");
+                }
             }
             if (affectState)
                 bitMask = bitMask | (1 << 5);