nop.isa revision 2636
12632Sstever@eecs.umich.edu// Copyright (c) 2006 The Regents of The University of Michigan 22632Sstever@eecs.umich.edu// All rights reserved. 32632Sstever@eecs.umich.edu// 42632Sstever@eecs.umich.edu// Redistribution and use in source and binary forms, with or without 52632Sstever@eecs.umich.edu// modification, are permitted provided that the following conditions are 62632Sstever@eecs.umich.edu// met: redistributions of source code must retain the above copyright 72632Sstever@eecs.umich.edu// notice, this list of conditions and the following disclaimer; 82632Sstever@eecs.umich.edu// redistributions in binary form must reproduce the above copyright 92632Sstever@eecs.umich.edu// notice, this list of conditions and the following disclaimer in the 102632Sstever@eecs.umich.edu// documentation and/or other materials provided with the distribution; 112632Sstever@eecs.umich.edu// neither the name of the copyright holders nor the names of its 122632Sstever@eecs.umich.edu// contributors may be used to endorse or promote products derived from 132632Sstever@eecs.umich.edu// this software without specific prior written permission. 142632Sstever@eecs.umich.edu// 152632Sstever@eecs.umich.edu// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 162632Sstever@eecs.umich.edu// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 172632Sstever@eecs.umich.edu// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 182632Sstever@eecs.umich.edu// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 192632Sstever@eecs.umich.edu// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 202632Sstever@eecs.umich.edu// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 212632Sstever@eecs.umich.edu// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 222632Sstever@eecs.umich.edu// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 232632Sstever@eecs.umich.edu// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 242632Sstever@eecs.umich.edu// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 252632Sstever@eecs.umich.edu// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 262632Sstever@eecs.umich.edu// 272632Sstever@eecs.umich.edu// Authors: Gabe Black 282632Sstever@eecs.umich.edu// Steve Reinhardt 292632Sstever@eecs.umich.edu 302022SN/A//////////////////////////////////////////////////////////////////// 312022SN/A// 322516SN/A// Nop instruction 332022SN/A// 342022SN/A 352636Sstever@eecs.umich.edu// Per-cpu-model nop execute method. 362636Sstever@eecs.umich.edudef template NopExec {{ 372636Sstever@eecs.umich.edu 382636Sstever@eecs.umich.edu Fault execute(%(CPU_exec_context)s *xc, Trace::InstRecord *traceData) const 392636Sstever@eecs.umich.edu { 402636Sstever@eecs.umich.edu // Nothing to see here, move along 412636Sstever@eecs.umich.edu return NoFault; 422636Sstever@eecs.umich.edu } 432636Sstever@eecs.umich.edu}}; 442636Sstever@eecs.umich.edu 452022SN/Aoutput header {{ 462022SN/A /** 472516SN/A * Nop class. 482022SN/A */ 492516SN/A class Nop : public SparcStaticInst 502022SN/A { 512516SN/A public: 522224SN/A // Constructor 532516SN/A Nop(const char *mnem, ExtMachInst _machInst, OpClass __opClass) : 542224SN/A SparcStaticInst(mnem, _machInst, __opClass) 552224SN/A { 562224SN/A } 572022SN/A 582516SN/A // All Nop instructions do the same thing, so this can be 592636Sstever@eecs.umich.edu // defined here. Nops can be defined directly, so there 602636Sstever@eecs.umich.edu // needs to be a default implementation. Interpolate via 612636Sstever@eecs.umich.edu // template so i gets expanded to a set of 622636Sstever@eecs.umich.edu // cpu-model-specific functions. 632636Sstever@eecs.umich.edu %(NopExec)s 642516SN/A 652224SN/A std::string generateDisassembly(Addr pc, 662224SN/A const SymbolTable *symtab) const; 672022SN/A }; 682022SN/A}}; 692022SN/A 702022SN/Aoutput decoder {{ 712516SN/A std::string Nop::generateDisassembly(Addr pc, 722224SN/A const SymbolTable *symtab) const 732022SN/A { 742516SN/A std::stringstream response; 752516SN/A printMnemonic(response, mnemonic); 762516SN/A return response.str(); 772022SN/A } 782022SN/A}}; 792022SN/A 802516SN/Adef template NopExecute {{ 812224SN/A Fault %(class_name)s::execute(%(CPU_exec_context)s *xc, 822224SN/A Trace::InstRecord *traceData) const 832022SN/A { 842224SN/A //Nothing to see here, move along 852224SN/A return NoFault; 862022SN/A } 872022SN/A}}; 882022SN/A 892022SN/A// Primary format for integer operate instructions: 902516SN/Adef format Nop(code, *opt_flags) {{ 912022SN/A orig_code = code 922022SN/A cblk = CodeBlock(code) 932516SN/A iop = InstObjParams(name, Name, 'Nop', cblk, opt_flags) 942022SN/A header_output = BasicDeclare.subst(iop) 952022SN/A decoder_output = BasicConstructor.subst(iop) 962469SN/A decode_block = BasicDecode.subst(iop) 972516SN/A exec_output = NopExecute.subst(iop) 982022SN/A}}; 99