src/arch/riscv/isa/base.isa

// -*- mode:c++ -*-

// Copyright (c) 2015 RISC-V Foundation
// Copyright (c) 2016 The University of Virginia
// 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
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Authors: Maxwell Walter
//          Alec Roelke

////////////////////////////////////////////////////////////////////
//
// Base class for Riscv instructions, and some support functions
//

//Outputs to decoder.hh
output header {{
    using namespace RiscvISA;

    /**
     * Base class for all RISC-V static instructions.
     */
    class RiscvStaticInst : public StaticInst
    {
      protected:
        // Constructor
        RiscvStaticInst(const char *mnem, MachInst _machInst,
            OpClass __opClass) : StaticInst(mnem, _machInst, __opClass)
        {}

        std::string
        regName(RegIndex reg) const;

        virtual std::string
        generateDisassembly(Addr pc, const SymbolTable *symtab) const = 0;

      public:
        void
        advancePC(RiscvISA::PCState &pc) const
        {
            pc.advance();
        }
    };
}};

//Ouputs to decoder.cc
output decoder {{
    std::string
    RiscvStaticInst::regName(RegIndex reg) const
    {
        if (reg < FP_Reg_Base) {
            return std::string(RegisterNames[reg]);
        } else {
            return std::string("f") + std::to_string(reg - FP_Reg_Base);
        }
    }
}};