isa/formats/unimp.isa

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

// Copyright N) 2007 MIPS Technologies, Inc.  All Rights Reserved

//  This software is part of the M5 simulator.

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//Authors: Korey L. 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;
        }

        %(BasicExecDeclare)s

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

        %(BasicExecDeclare)s

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

        %(BasicExecDeclare)s

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

        %(BasicExecDeclare)s

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

    /**
     * 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;
        }

        %(BasicExecDeclare)s

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

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(%(CPU_exec_context)s *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 new UnimplementedOpcodeFault;
    }

    Fault
    CP0Unimplemented::execute(%(CPU_exec_context)s *xc,
                               Trace::InstRecord *traceData) const
    {
#if  FULL_SYSTEM
      if (!isCoprocessorEnabled(xc, 0)) {
        return new CoprocessorUnusableFault(0);
      }
      return new ReservedInstructionFault;
#else
        panic("attempt to execute unimplemented instruction '%s' "
              "(inst 0x%08x, opcode 0x%x, binary:%s)", mnemonic, machInst, OPCODE,
              inst2string(machInst));
        return new UnimplementedOpcodeFault;
#endif
    }

    Fault
    CP1Unimplemented::execute(%(CPU_exec_context)s *xc,
                               Trace::InstRecord *traceData) const
    {
#if  FULL_SYSTEM
      if (!isCoprocessorEnabled(xc, 1)) {
        return new CoprocessorUnusableFault(1);
      }
      return new ReservedInstructionFault;
#else
        panic("attempt to execute unimplemented instruction '%s' "
              "(inst 0x%08x, opcode 0x%x, binary:%s)", mnemonic, machInst, OPCODE,
              inst2string(machInst));
        return new UnimplementedOpcodeFault;
#endif
    }
    Fault
    CP2Unimplemented::execute(%(CPU_exec_context)s *xc,
                               Trace::InstRecord *traceData) const
    {
#if  FULL_SYSTEM
      if (!isCoprocessorEnabled(xc, 2)) {
        return new CoprocessorUnusableFault(2);
      }
      return new ReservedInstructionFault;
#else
        panic("attempt to execute unimplemented instruction '%s' "
              "(inst 0x%08x, opcode 0x%x, binary:%s)", mnemonic, machInst, OPCODE,
              inst2string(machInst));
        return new UnimplementedOpcodeFault;
#endif
    }

    Fault
    WarnUnimplemented::execute(%(CPU_exec_context)s *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)
}};