nop.isa revision 12236:126ac9da6050 
1// Copyright (c) 2006-2007 The Regents of The University of Michigan
2// All rights reserved.
3//
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5// modification, are permitted provided that the following conditions are
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13// this software without specific prior written permission.
14//
15// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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20// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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26//
27// Authors: Gabe Black
28//          Steve Reinhardt
29
30////////////////////////////////////////////////////////////////////
31//
32// Nop instruction
33//
34
35// Per-cpu-model nop execute method.
36def template NopExec {{
37}};
38
39output header {{
40        /**
41         * Nop class.
42         */
43        class Nop : public SparcStaticInst
44        {
45          public:
46            // Constructor
47            Nop(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
48                SparcStaticInst(mnem, _machInst, __opClass)
49            {
50                flags[IsNop] = true;
51            }
52
53            Fault
54            execute(ExecContext *xc, Trace::InstRecord *traceData) const
55            {
56                return NoFault;
57            }
58
59            std::string generateDisassembly(Addr pc,
60                    const SymbolTable *symtab) const;
61        };
62}};
63
64output decoder {{
65        std::string Nop::generateDisassembly(Addr pc,
66                const SymbolTable *symtab) const
67        {
68            std::stringstream response;
69            printMnemonic(response, mnemonic);
70            return response.str();
71        }
72}};
73
74def template NopExecute {{
75        Fault %(class_name)s::execute(ExecContext *xc,
76                Trace::InstRecord *traceData) const
77        {
78            // Nothing to see here, move along
79            return NoFault;
80        }
81}};
82
83// Primary format for integer operate instructions:
84def format Nop(code, *opt_flags) {{
85        iop = InstObjParams(name, Name, 'Nop', code, opt_flags)
86        header_output = BasicDeclare.subst(iop)
87        decoder_output = BasicConstructor.subst(iop)
88        decode_block = BasicDecode.subst(iop)
89        exec_output = NopExecute.subst(iop)
90}};
91