src/arch/x86/isa/formats/unimp.isa

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

// Copyright (c) 2007 The Hewlett-Packard Development Company
// All rights reserved.
//
// The license below extends only to copyright in the software and shall
// not be construed as granting a license to any other intellectual
// property including but not limited to intellectual property relating
// to a hardware implementation of the functionality of the software
// licensed hereunder.  You may use the software subject to the license
// terms below provided that you ensure that this notice is replicated
// unmodified and in its entirety in all distributions of the software,
// modified or unmodified, in source code or in binary form.
//
// 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.

////////////////////////////////////////////////////////////////////
//
// Unimplemented instructions
//

output header {{
    /**
     * Static instruction class for unimplemented instructions that
     * cause simulator termination.  Note that these are recognized
     * (legal) instructions that the simulator does not support; the
     * 'Unknown' class is used for unrecognized/illegal instructions.
     * This is a leaf class.
     */
    class FailUnimplemented : public X86ISA::X86StaticInst
    {
      public:
        /// Constructor
        FailUnimplemented(const char *_mnemonic, ExtMachInst _machInst)
            : X86ISA::X86StaticInst(_mnemonic, _machInst, No_OpClass)
        {
            // don't call execute() (which panics) if we're on a
            // speculative path
            flags[IsNonSpeculative] = true;
        }

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

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

    /**
     * Base class for unimplemented instructions that cause a warning
     * to be printed (but do not terminate simulation).  This
     * implementation is a little screwy in that it will print a
     * warning for each instance of a particular unimplemented machine
     * instruction, not just for each unimplemented opcode.  Should
     * probably make the 'warned' flag a static member of the derived
     * class.
     */
    class WarnUnimplemented : public X86ISA::X86StaticInst
    {
      private:
        /// Have we warned on this instruction yet?
        mutable bool warned = false;

      public:
        /// Constructor
        WarnUnimplemented(const char *_mnemonic, ExtMachInst _machInst)
            : X86ISA::X86StaticInst(_mnemonic, _machInst, No_OpClass)
        {
            // don't call execute() (which panics) if we're on a
            // speculative path
            flags[IsNonSpeculative] = true;
        }

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

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

output decoder {{
    std::string
    FailUnimplemented::generateDisassembly(
            Addr pc, const Loader::SymbolTable *symtab) const
    {
        return csprintf("%-10s (unimplemented)", mnemonic);
    }

    std::string
    WarnUnimplemented::generateDisassembly(
            Addr pc, const Loader::SymbolTable *symtab) const
    {
        return csprintf("%-10s (unimplemented)", mnemonic);
    }
}};

output exec {{
    Fault
    FailUnimplemented::execute(ExecContext *xc,
                               Trace::InstRecord *traceData) const
    {
        panic("attempt to execute unimplemented instruction '%s' %s",
                mnemonic, machInst);
        return NoFault;
    }

    Fault
    WarnUnimplemented::execute(ExecContext *xc,
                               Trace::InstRecord *traceData) const
    {
        if (!warned) {
            warn("instruction '%s' unimplemented\n", mnemonic);
            warned = true;
        }

        return NoFault;
    }
}};


def format FailUnimpl() {{
    iop = InstObjParams(name, 'FailUnimplemented')
    decode_block = BasicDecodeWithMnemonic.subst(iop)
}};

def format WarnUnimpl() {{
    iop = InstObjParams(name, 'WarnUnimplemented')
    decode_block = BasicDecodeWithMnemonic.subst(iop)
}};