unimp.isa revision 12616:4b463b4dc098 
1// -*- mode:c++ -*-
2
3// Copyright (c) 2007-2008 The Florida State University
4// Copyright (c) 2009 The University of Edinburgh
5// All rights reserved.
6//
7// Redistribution and use in source and binary forms, with or without
8// modification, are permitted provided that the following conditions are
9// met: redistributions of source code must retain the above copyright
10// notice, this list of conditions and the following disclaimer;
11// redistributions in binary form must reproduce the above copyright
12// notice, this list of conditions and the following disclaimer in the
13// documentation and/or other materials provided with the distribution;
14// neither the name of the copyright holders nor the names of its
15// contributors may be used to endorse or promote products derived from
16// this software without specific prior written permission.
17//
18// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29//
30// Authors: Stephen Hines
31//          Timothy M. Jones
32
33////////////////////////////////////////////////////////////////////
34//
35// Unimplemented instructions
36//
37
38output header {{
39    /**
40     * Static instruction class for unimplemented instructions that
41     * cause simulator termination.  Note that these are recognized
42     * (legal) instructions that the simulator does not support; the
43     * 'Unknown' class is used for unrecognized/illegal instructions.
44     * This is a leaf class.
45     */
46    class FailUnimplemented : public PowerStaticInst
47    {
48      public:
49        /// Constructor
50        FailUnimplemented(const char *_mnemonic, MachInst _machInst)
51            : PowerStaticInst(_mnemonic, _machInst, No_OpClass)
52        {
53            // don't call execute() (which panics) if we're on a
54            // speculative path
55            flags[IsNonSpeculative] = true;
56        }
57
58        Fault execute(ExecContext *, Trace::InstRecord *) const override;
59
60        std::string generateDisassembly(
61                Addr pc, const SymbolTable *symtab) const override;
62    };
63
64    /**
65     * Base class for unimplemented instructions that cause a warning
66     * to be printed (but do not terminate simulation).  This
67     * implementation is a little screwy in that it will print a
68     * warning for each instance of a particular unimplemented machine
69     * instruction, not just for each unimplemented opcode.  Should
70     * probably make the 'warned' flag a static member of the derived
71     * class.
72     */
73    class WarnUnimplemented : public PowerStaticInst
74    {
75      private:
76        /// Have we warned on this instruction yet?
77        mutable bool warned;
78
79      public:
80        /// Constructor
81        WarnUnimplemented(const char *_mnemonic, MachInst _machInst)
82            : PowerStaticInst(_mnemonic, _machInst, No_OpClass), warned(false)
83        {
84            // don't call execute() (which panics) if we're on a
85            // speculative path
86            flags[IsNonSpeculative] = true;
87        }
88
89        Fault execute(ExecContext *, Trace::InstRecord *) const override;
90
91        std::string generateDisassembly(
92                Addr pc, const SymbolTable *symtab) const override;
93    };
94}};
95
96output decoder {{
97    std::string
98    FailUnimplemented::generateDisassembly(Addr pc,
99                                           const SymbolTable *symtab) const
100    {
101        return csprintf("%-10s (unimplemented)", mnemonic);
102    }
103
104    std::string
105    WarnUnimplemented::generateDisassembly(Addr pc,
106                                           const SymbolTable *symtab) const
107    {
108        return csprintf("%-10s (unimplemented)", mnemonic);
109    }
110}};
111
112output exec {{
113    Fault
114    FailUnimplemented::execute(ExecContext *xc,
115                               Trace::InstRecord *traceData) const
116    {
117        panic("attempt to execute unimplemented instruction '%s' "
118              "(inst 0x%08x, opcode 0x%x, binary:%s)", mnemonic, machInst, OPCODE,
119              inst2string(machInst));
120        return std::make_shared<UnimplementedOpcodeFault>();
121    }
122
123    Fault
124    WarnUnimplemented::execute(ExecContext *xc,
125                               Trace::InstRecord *traceData) const
126    {
127        if (!warned) {
128            warn("\tinstruction '%s' unimplemented\n", mnemonic);
129            warned = true;
130        }
131
132        return NoFault;
133    }
134}};
135
136
137def format FailUnimpl() {{
138    iop = InstObjParams(name, 'FailUnimplemented')
139    decode_block = BasicDecodeWithMnemonic.subst(iop)
140}};
141
142def format WarnUnimpl() {{
143    iop = InstObjParams(name, 'WarnUnimplemented')
144    decode_block = BasicDecodeWithMnemonic.subst(iop)
145}};
146
147