1// -*- mode:c++ -*-
2
3// Copyright (c) 2006 The Regents of The University of Michigan
4// All rights reserved.
5//
6// Redistribution and use in source and binary forms, with or without
7// modification, are permitted provided that the following conditions are
8// met: redistributions of source code must retain the above copyright
9// notice, this list of conditions and the following disclaimer;
10// redistributions in binary form must reproduce the above copyright
11// notice, this list of conditions and the following disclaimer in the
12// documentation and/or other materials provided with the distribution;
13// neither the name of the copyright holders nor the names of its
14// contributors may be used to endorse or promote products derived from
15// this software without specific prior written permission.
16//
17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28//
29// Authors: Korey Sewell
30
31////////////////////////////////////////////////////////////////////
32//
33// Unknown instructions
34//
35
36output header {{
37    /**
38     * Static instruction class for unknown (illegal) instructions.
39     * These cause simulator termination if they are executed in a
40     * non-speculative mode.  This is a leaf class.
41     */
42    class Unknown : public MipsStaticInst
43    {
44      public:
45        /// Constructor
46        Unknown(MachInst _machInst)
47            : MipsStaticInst("unknown", _machInst, No_OpClass)
48        {
49            // don't call execute() (which panics) if we're on a
50            // speculative path
51            flags[IsNonSpeculative] = true;
52        }
53
54        Fault execute(ExecContext *, Trace::InstRecord *) const override;
55
56        std::string generateDisassembly(
57                Addr pc, const SymbolTable *symtab) const override;
58    };
59}};
60
61output decoder {{
62    std::string
63    Unknown::generateDisassembly(Addr pc, const SymbolTable *symtab) const
64    {
65        return csprintf("%-10s (inst 0x%x, opcode 0x%x, binary:%s)",
66                        "unknown", machInst, OPCODE, inst2string(machInst));
67    }
68}};
69
70output exec {{
71    Fault
72    Unknown::execute(ExecContext *xc, Trace::InstRecord *traceData) const
73    {
74        return std::make_shared<ReservedInstructionFault>();
75    }
76}};
77
78def format Unknown() {{
79    decode_block = 'return new Unknown(machInst);\n'
80}};
81
82