nop.isa revision 7741:340b6f01d69b
1// Copyright (c) 2006-2007 The Regents of The University of Michigan 2// All rights reserved. 3// 4// Redistribution and use in source and binary forms, with or without 5// modification, are permitted provided that the following conditions are 6// met: redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer; 8// redistributions in binary form must reproduce the above copyright 9// notice, this list of conditions and the following disclaimer in the 10// documentation and/or other materials provided with the distribution; 11// neither the name of the copyright holders nor the names of its 12// contributors may be used to endorse or promote products derived from 13// this software without specific prior written permission. 14// 15// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 19// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26// 27// Authors: Gabe Black 28// Steve Reinhardt 29 30//////////////////////////////////////////////////////////////////// 31// 32// Nop instruction 33// 34 35// Per-cpu-model nop execute method. 36def template NopExec {{ 37 38 Fault execute(%(CPU_exec_context)s *xc, Trace::InstRecord *traceData) const 39 { 40 // Nothing to see here, move along 41 return NoFault; 42 } 43}}; 44 45output header {{ 46 /** 47 * Nop class. 48 */ 49 class Nop : public SparcStaticInst 50 { 51 public: 52 // Constructor 53 Nop(const char *mnem, ExtMachInst _machInst, OpClass __opClass) : 54 SparcStaticInst(mnem, _machInst, __opClass) 55 { 56 flags[IsNop] = true; 57 } 58 59 // All Nop instructions do the same thing, so this can be 60 // defined here. Nops can be defined directly, so there 61 // needs to be a default implementation. Interpolate via 62 // template so i gets expanded to a set of 63 // cpu-model-specific functions. 64 %(NopExec)s 65 66 std::string generateDisassembly(Addr pc, 67 const SymbolTable *symtab) const; 68 }; 69}}; 70 71output decoder {{ 72 std::string Nop::generateDisassembly(Addr pc, 73 const SymbolTable *symtab) const 74 { 75 std::stringstream response; 76 printMnemonic(response, mnemonic); 77 return response.str(); 78 } 79}}; 80 81def template NopExecute {{ 82 Fault %(class_name)s::execute(%(CPU_exec_context)s *xc, 83 Trace::InstRecord *traceData) const 84 { 85 // Nothing to see here, move along 86 return NoFault; 87 } 88}}; 89 90// Primary format for integer operate instructions: 91def format Nop(code, *opt_flags) {{ 92 iop = InstObjParams(name, Name, 'Nop', code, opt_flags) 93 header_output = BasicDeclare.subst(iop) 94 decoder_output = BasicConstructor.subst(iop) 95 decode_block = BasicDecode.subst(iop) 96 exec_output = NopExecute.subst(iop) 97}}; 98