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

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

// Copyright (c) 2007 MIPS Technologies, Inc.
// 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
// 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.
//
// Authors: Korey Sewell

////////////////////////////////////////////////////////////////////
//
// 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 MipsStaticInst
    {
      public:
        /// Constructor
        FailUnimplemented(const char *_mnemonic, MachInst _machInst)
            : MipsStaticInst(_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 SymbolTable *symtab) const override;
    };
    class CP0Unimplemented : public MipsStaticInst
    {
      public:
        /// Constructor
        CP0Unimplemented(const char *_mnemonic, MachInst _machInst)
            : MipsStaticInst(_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 SymbolTable *symtab) const override;
    };
    class CP1Unimplemented : public MipsStaticInst
    {
      public:
        /// Constructor
        CP1Unimplemented(const char *_mnemonic, MachInst _machInst)
            : MipsStaticInst(_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 SymbolTable *symtab) const override;
    };
    class CP2Unimplemented : public MipsStaticInst
    {
      public:
        /// Constructor
        CP2Unimplemented(const char *_mnemonic, MachInst _machInst)
            : MipsStaticInst(_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 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 MipsStaticInst
    {
      private:
        /// Have we warned on this instruction yet?
        mutable bool warned;

      public:
        /// Constructor
        WarnUnimplemented(const char *_mnemonic, MachInst _machInst)
            : MipsStaticInst(_mnemonic, _machInst, No_OpClass), warned(false)
        {
            // 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 SymbolTable *symtab) const override;
    };
}};

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

    std::string
    CP0Unimplemented::generateDisassembly(Addr pc,
                                           const SymbolTable *symtab) const
    {
        return csprintf("%-10s (unimplemented)", mnemonic);
    }

    std::string
    CP1Unimplemented::generateDisassembly(Addr pc,
                                           const SymbolTable *symtab) const
    {
        return csprintf("%-10s (unimplemented)", mnemonic);
    }
    std::string
    CP2Unimplemented::generateDisassembly(Addr pc,
                                           const SymbolTable *symtab) const
    {
        return csprintf("%-10s (unimplemented)", mnemonic);
    }

    std::string
    WarnUnimplemented::generateDisassembly(Addr pc,
                                           const 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' "
              "(inst 0x%08x, opcode 0x%x, binary:%s)", mnemonic, machInst, OPCODE,
              inst2string(machInst));
        return NoFault;
    }

    Fault
    CP0Unimplemented::execute(ExecContext *xc,
                               Trace::InstRecord *traceData) const
    {
        if (FullSystem) {
            if (!isCoprocessorEnabled(xc, 0))
                return std::make_shared<CoprocessorUnusableFault>(0);
            else
                return std::make_shared<ReservedInstructionFault>();
        } else {
            panic("attempt to execute unimplemented instruction '%s' "
                    "(inst %#08x, opcode %#x, binary:%s)",
                    mnemonic, machInst, OPCODE, inst2string(machInst));
            return NoFault;
        }
    }

    Fault
    CP1Unimplemented::execute(ExecContext *xc,
                               Trace::InstRecord *traceData) const
    {
        if (FullSystem) {
            if (!isCoprocessorEnabled(xc, 1))
                return std::make_shared<CoprocessorUnusableFault>(1);
            else
                return std::make_shared<ReservedInstructionFault>();
        } else {
            panic("attempt to execute unimplemented instruction '%s' "
                    "(inst %#08x, opcode %#x, binary:%s)",
                    mnemonic, machInst, OPCODE, inst2string(machInst));
            return NoFault;
        }
    }

    Fault
    CP2Unimplemented::execute(ExecContext *xc,
                               Trace::InstRecord *traceData) const
    {
        if (FullSystem) {
            if (!isCoprocessorEnabled(xc, 2))
                return std::make_shared<CoprocessorUnusableFault>(2);
            else
                return std::make_shared<ReservedInstructionFault>();
        } else {
            panic("attempt to execute unimplemented instruction '%s' "
                    "(inst %#08x, opcode %#x, binary:%s)",
                    mnemonic, machInst, OPCODE, inst2string(machInst));
            return NoFault;
        }
    }

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

        return NoFault;
    }
}};


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

}};
def format CP0Unimpl() {{
    iop = InstObjParams(name, 'CP0Unimplemented')
    decode_block = BasicDecodeWithMnemonic.subst(iop)
}};
def format CP1Unimpl() {{
    iop = InstObjParams(name, 'CP1Unimplemented')
    decode_block = BasicDecodeWithMnemonic.subst(iop)
}};
def format CP2Unimpl() {{
    iop = InstObjParams(name, 'CP2Unimplemented')
    decode_block = BasicDecodeWithMnemonic.subst(iop)
}};
def format WarnUnimpl() {{
    iop = InstObjParams(name, 'WarnUnimplemented')
    decode_block = BasicDecodeWithMnemonic.subst(iop)
}};