xref: /gem5/src/arch/mips/isa/formats/unknown.isa

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

// Copyright (c) 2003-2005 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
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// 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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//
// Authors: Korey Sewell

////////////////////////////////////////////////////////////////////
//
// Unknown instructions
//

output header {{
        std::string inst2string(MachInst machInst);
}};
output decoder {{

std::string inst2string(MachInst machInst)
{
    string str = "";
    uint32_t mask = 0x80000000;

    for(int i=0; i < 32; i++) {
        if ((machInst & mask) == 0) {
            str += "0";
        } else {
            str += "1";
        }

        mask = mask >> 1;
    }

    return str;
}

    std::string
    Unknown::generateDisassembly(Addr pc, const SymbolTable *symtab) const
    {
        return csprintf("%-10s (inst 0x%x, opcode 0x%x, binary:%s)",
                        "unknown", machInst, OPCODE, inst2string(machInst));
    }
}};

output exec {{
    Fault
    Unknown::execute(%(CPU_exec_context)s *xc,
                     Trace::InstRecord *traceData) const
    {
        panic("attempt to execute unknown instruction "
              "(inst 0x%08x, opcode 0x%x, binary: %s)", machInst, OPCODE, inst2string(machInst));
        return new UnimplementedOpcodeFault;
    }
}};

def format Unknown() {{
    decode_block = 'return new Unknown(machInst);\n'
}};