1// -*- mode:c++ -*- 2
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3// Copyright (c) 2003-2006 The Regents of The University of Michigan
4// All rights reserved.
5//
6// Redistribution and use in source and binary forms, with or without
7// modification, are permitted provided that the following conditions are
8// met: redistributions of source code must retain the above copyright
9// notice, this list of conditions and the following disclaimer;
10// redistributions in binary form must reproduce the above copyright
11// notice, this list of conditions and the following disclaimer in the
12// documentation and/or other materials provided with the distribution;
13// neither the name of the copyright holders nor the names of its
14// contributors may be used to endorse or promote products derived from
15// this software without specific prior written permission.
16//
17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28//
29// Authors: Korey Sewell
30
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3//////////////////////////////////////////////////////////////////// 4// 5// Nop 6// 7 8output header {{ 9 /** 10 * Static instruction class for no-ops. This is a leaf class. 11 */ 12 class Nop : public MipsStaticInst 13 { 14 /// Disassembly of original instruction. 15 const std::string originalDisassembly; 16 17 public: 18 /// Constructor 19 Nop(const std::string _originalDisassembly, MachInst _machInst) 20 : MipsStaticInst("nop", _machInst, No_OpClass), 21 originalDisassembly(_originalDisassembly) 22 { 23 flags[IsNop] = true; 24 } 25 26 ~Nop() { } 27 28 std::string 29 generateDisassembly(Addr pc, const SymbolTable *symtab) const; 30 31 %(BasicExecDeclare)s 32 }; 33}}; 34 35output decoder {{ 36 std::string Nop::generateDisassembly(Addr pc, 37 const SymbolTable *symtab) const 38 { 39 return csprintf("%-10s %s", "nop", originalDisassembly); 40 } 41 42 /// Helper function for decoding nops. Substitute Nop object 43 /// for original inst passed in as arg (and delete latter). 44 inline 45 MipsStaticInst * 46 makeNop(MipsStaticInst *inst) 47 {
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76 MipsStaticInst *nop = new Nop(inst->disassemble(0), inst->machInst);
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48 std::string nop_str = "(" + inst->disassemble(0) + ")"; 49 MipsStaticInst *nop = new Nop(nop_str, inst->machInst); |
50 delete inst; 51 return nop; 52 } 53}}; 54 55output exec {{ 56 Fault 57 Nop::execute(%(CPU_exec_context)s *, Trace::InstRecord *) const 58 { 59 return NoFault; 60 } 61}}; 62
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90// integer & FP operate instructions use RT as dest, so check for
91// RT == 0 to detect nops
92def template OperateNopCheckDecode {{
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63// Int & FP operate instructions use RD as dest, so check for 64// RD == 0 to detect nops 65def template RegNopCheckDecode {{ |
66 { 67 MipsStaticInst *i = new %(class_name)s(machInst);
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68 //if (RD == 0) { 69 //i = makeNop(i); 70 //} 71 return i; 72 } 73}}; |
74
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75def template OperateNopCheckDecode {{ 76 { 77 MipsStaticInst *i = new %(class_name)s(machInst); |
78 //if (RD == 0) {
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97 // i = makeNop(i);
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79 // i = makeNop(i); |
80 //}
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81 return i; 82 } 83}}; |
84
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85// IntImm & Memory instructions use Rt as dest, so check for 86// Rt == 0 to detect nops 87def template ImmNopCheckDecode {{ 88 { 89 MipsStaticInst *i = new %(class_name)s(machInst); 90 //if (RT == 0) { 91 // i = makeNop(i); 92 // } |
93 return i; 94 } 95}}; 96 97 98// Like BasicOperate format, but generates NOP if RC/FC == 31 99def format BasicOperateWithNopCheck(code, *opt_args) {{ 100 iop = InstObjParams(name, Name, 'MipsStaticInst', CodeBlock(code), 101 opt_args) 102 header_output = BasicDeclare.subst(iop) 103 decoder_output = BasicConstructor.subst(iop) 104 decode_block = OperateNopCheckDecode.subst(iop) 105 exec_output = BasicExecute.subst(iop) 106}}; 107 108def format Nop() {{ 109 decode_block = 'return new Nop(\"\",machInst);\n' 110}}; 111
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