src/arch/sparc/insts/nop.cc

// Copyright (c) 2006-2007 The Regents of The University of Michigan
// 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: Gabe Black
//          Steve Reinhardt

////////////////////////////////////////////////////////////////////
//
// Nop instruction
//

// Per-cpu-model nop execute method.
def template NopExec {{
}};

output header {{
        /**
         * Nop class.
         */
        class Nop : public SparcStaticInst
        {
          public:
            // Constructor
            Nop(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
                SparcStaticInst(mnem, _machInst, __opClass)
            {
                flags[IsNop] = true;
            }

            Fault
            execute(ExecContext *xc, Trace::InstRecord *traceData) const
            {
                return NoFault;
            }

            std::string generateDisassembly(Addr pc,
                    const SymbolTable *symtab) const;
        };
}};

output decoder {{
        std::string Nop::generateDisassembly(Addr pc,
                const SymbolTable *symtab) const
        {
            std::stringstream response;
            printMnemonic(response, mnemonic);
            return response.str();
        }
}};

def template NopExecute {{
        Fault %(class_name)s::execute(ExecContext *xc,
                Trace::InstRecord *traceData) const
        {
            // Nothing to see here, move along
            return NoFault;
        }
}};

// Primary format for integer operate instructions:
def format Nop(code, *opt_flags) {{
        iop = InstObjParams(name, Name, 'Nop', code, opt_flags)
        header_output = BasicDeclare.subst(iop)
        decoder_output = BasicConstructor.subst(iop)
        decode_block = BasicDecode.subst(iop)
        exec_output = NopExecute.subst(iop)
}};