src/arch/x86/isa/formats/unknown.isa

// Copyright (c) 2007 The Hewlett-Packard Development Company
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////////////////////////////////////////////////////////////////////
//
// Unknown instructions
//

output header {{
    /**
     * Class for Unknown/Illegal instructions
     */
    class Unknown : public X86ISA::X86StaticInst
    {
      public:

        // Constructor
        Unknown(ExtMachInst _machInst) :
                X86ISA::X86StaticInst("unknown", _machInst, No_OpClass)
        {
        }

        Fault execute(ExecContext *, Trace::InstRecord *) const override;

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

    };
}};

output decoder {{
    std::string
    Unknown::generateDisassembly(
            Addr pc, const Loader::SymbolTable *symtab) const
    {
        return "Unknown instruction";
    }
}};

output exec {{
    Fault
    Unknown::execute(ExecContext *xc, Trace::InstRecord *traceData) const
    {
        return std::make_shared<InvalidOpcode>();
    }
}};

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