From d2ba9243f5f237b645207a5194954b851133e7c5 Mon Sep 17 00:00:00 2001
From: Ali Saidi <Ali.Saidi@ARM.com>
Date: Wed, 2 Jun 2010 12:58:16 -0500
Subject: [PATCH] ARM: Add BKPT instruction

--HG--
rename : src/arch/arm/isa/formats/unknown.isa => src/arch/arm/isa/formats/breakpoint.isa
---
 src/arch/arm/isa/decoder/arm.isa        |  1 +
 src/arch/arm/isa/formats/breakpoint.isa | 94 +++++++++++++++++++++++++
 src/arch/arm/isa/formats/formats.isa    |  3 +
 3 files changed, 98 insertions(+)
 create mode 100644 src/arch/arm/isa/formats/breakpoint.isa

diff --git a/src/arch/arm/isa/decoder/arm.isa b/src/arch/arm/isa/decoder/arm.isa
index 467b98eaa..1e0d61b3f 100644
--- a/src/arch/arm/isa/decoder/arm.isa
+++ b/src/arch/arm/isa/decoder/arm.isa
@@ -73,6 +73,7 @@ format DataOp {
                         0x9: ArmBlxReg::armBlxReg();
                     }
                     0x5: ArmSatAddSub::armSatAddSub();
+                    0x7: Breakpoint::bkpt();
                 }
                 0x1: ArmHalfWordMultAndMultAcc::armHalfWordMultAndMultAcc();
             }
diff --git a/src/arch/arm/isa/formats/breakpoint.isa b/src/arch/arm/isa/formats/breakpoint.isa
new file mode 100644
index 000000000..fac652d8e
--- /dev/null
+++ b/src/arch/arm/isa/formats/breakpoint.isa
@@ -0,0 +1,94 @@
+// -*- mode:c++ -*-
+
+// Copyright (c) 2010 ARM Limited
+// All rights reserved
+//
+// The license below extends only to copyright in the software and shall
+// not be construed as granting a license to any other intellectual
+// property including but not limited to intellectual property relating
+// to a hardware implementation of the functionality of the software
+// licensed hereunder.  You may use the software subject to the license
+// terms below provided that you ensure that this notice is replicated
+// unmodified and in its entirety in all distributions of the software,
+// modified or unmodified, in source code or in binary form.
+//
+// Copyright (c) 2007-2008 The Florida State University
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met: redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer;
+// redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in the
+// documentation and/or other materials provided with the distribution;
+// neither the name of the copyright holders nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Authors: Stephen Hines
+
+////////////////////////////////////////////////////////////////////
+//
+// Breakpoint instructions
+//
+
+output header {{
+    /**
+     * Static instruction class for Breakpoint (illegal) instructions.
+     * These cause simulator termination if they are executed in a
+     * non-speculative mode.  This is a leaf class.
+     */
+    class Breakpoint : public ArmStaticInst
+    {
+      public:
+        /// Constructor
+        Breakpoint(ExtMachInst _machInst)
+            : ArmStaticInst("Breakpoint", _machInst, No_OpClass)
+        {
+            // don't call execute() (which panics) if we're on a
+            // speculative path
+            flags[IsNonSpeculative] = true;
+        }
+
+        %(BasicExecDeclare)s
+
+        std::string
+        generateDisassembly(Addr pc, const SymbolTable *symtab) const;
+    };
+}};
+
+output decoder {{
+    std::string
+    Breakpoint::generateDisassembly(Addr pc, const SymbolTable *symtab) const
+    {
+        return csprintf("%-10s (inst 0x%x, opcode 0x%x, binary:%s)",
+                        "Breakpoint", machInst, OPCODE, inst2string(machInst));
+    }
+}};
+
+output exec {{
+    Fault
+    Breakpoint::execute(%(CPU_exec_context)s *xc,
+                     Trace::InstRecord *traceData) const
+    {
+        return new PrefetchAbort(xc->readPC(), ArmFault::DebugEvent);
+    }
+}};
+
+def format Breakpoint() {{
+    decode_block = 'return new Breakpoint(machInst);\n'
+}};
+
diff --git a/src/arch/arm/isa/formats/formats.isa b/src/arch/arm/isa/formats/formats.isa
index 53ad3f729..a42a33365 100644
--- a/src/arch/arm/isa/formats/formats.isa
+++ b/src/arch/arm/isa/formats/formats.isa
@@ -68,6 +68,9 @@
 //Include the unknown format
 ##include "unknown.isa"
 
+//Include the breakpoint format
+##include "breakpoint.isa"
+
 //Include the formats for data processing instructions
 ##include "data.isa"