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

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

// Copyright (c) 2003-2006 The Regents of The University of Michigan
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// Authors: Korey Sewell

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

output header {{
    /**
     * Static instruction class for unknown (illegal) instructions.
     * These cause simulator termination if they are executed in a
     * non-speculative mode.  This is a leaf class.
     */
    class Unknown : public MipsStaticInst
    {
      public:
        /// Constructor
        Unknown(MachInst _machInst)
            : MipsStaticInst("unknown", _machInst, No_OpClass)
        {
            // don't call execute() (which panics) if we're on a
            // speculative path
            flags[IsNonSpeculative] = true;
        }

        %(BasicExecDeclare)s

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

output decoder {{
    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'
}};