gem5  v21.1.0.2
nop.cc
Go to the documentation of this file.
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 
28 //
29 // Nop instruction
30 //
31 
32 // Per-cpu-model nop execute method.
33 def template NopExec {{
34 }};
35 
40  class Nop : public SparcStaticInst
41  {
42  public:
43  // Constructor
44  Nop(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
45  SparcStaticInst(mnem, _machInst, __opClass)
46  {
47  flags[IsNop] = true;
48  }
49 
50  Fault
51  execute(ExecContext *xc, Trace::InstRecord *traceData) const
52  {
53  return NoFault;
54  }
55 
56  std::string generateDisassembly(Addr pc,
57  const loader::SymbolTable *symtab) const override;
58  };
59 }};
60 
62  std::string
63  Nop::generateDisassembly(
64  Addr pc, const loader::SymbolTable *symtab) const
65  {
66  std::stringstream response;
67  printMnemonic(response, mnemonic);
68  return response.str();
69  }
70 }};
71 
72 def template NopExecute {{
73  Fault %(class_name)s::execute(ExecContext *xc,
74  Trace::InstRecord *traceData) const
75  {
76  // Nothing to see here, move along
77  return NoFault;
78  }
79 }};
80 
81 // Primary format for integer operate instructions:
82 def format Nop(code, *opt_flags) {{
83  iop = InstObjParams(name, Name, 'Nop', code, opt_flags)
84  header_output = BasicDeclare.subst(iop)
85  decoder_output = BasicConstructor.subst(iop)
86  decode_block = BasicDecode.subst(iop)
87  exec_output = NopExecute.subst(iop)
88 }};
gem5::NoFault
constexpr decltype(nullptr) NoFault
Definition: types.hh:260
gem5::ArmISA::format
Bitfield< 31, 29 > format
Definition: misc_types.hh:646
header
output header
Definition: nop.cc:36
Nop
def format Nop(code, *opt_flags)
Definition: nop.cc:82
gem5::Fault
std::shared_ptr< FaultBase > Fault
Definition: types.hh:255
gem5::MipsISA::ExtMachInst
uint64_t ExtMachInst
Definition: types.hh:43
NopExecute
def template NopExecute
Definition: nop.cc:72
NopExec
def template NopExec
Definition: nop.cc:33
gem5::Trace::output
std::ostream & output()
Get the ostream from the current global logger.
Definition: trace.cc:79
gem5::Addr
uint64_t Addr
Address type This will probably be moved somewhere else in the near future.
Definition: types.hh:147
name
const std::string & name()
Definition: trace.cc:49
gem5::MipsISA::pc
Bitfield< 4 > pc
Definition: pra_constants.hh:243
decoder
output decoder
Definition: nop.cc:61

Generated on Tue Sep 21 2021 12:24:51 for gem5 by doxygen 1.8.17