unknown.isa

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· ISA 代码 · 共 82 行

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

//Copyright (c) 2006
//The Regents of The University of Michigan
//All Rights Reserved

//This code is part of the M5 simulator.

//Permission is granted to use, copy, create derivative works and
//redistribute this software and such derivative works for any purpose,
//so long as the copyright notice above, this grant of permission, and
//the disclaimer below appear in all copies made; and so long as the
//name of The University of Michigan is not used in any advertising or
//publicity pertaining to the use or distribution of this software
//without specific, written prior authorization.

//THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
//UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND WITHOUT
//WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER EXPRESS OR
//IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
//MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE REGENTS OF
//THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE FOR ANY DAMAGES,
//INCLUDING DIRECT, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
//DAMAGES, WITH RESPECT TO ANY CLAIM ARISING OUT OF OR IN CONNECTION
//WITH THE USE OF THE SOFTWARE, EVEN IF IT HAS BEEN OR IS HEREAFTER
//ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

//Authors: Korey L. 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
    {
	return new ReservedInstructionFault;
    }
}};

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