1// -*- mode:c++ -*-
2
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
31////////////////////////////////////////////////////////////////////
32//
33// Nop
34//
35
36output header {{
37 /**
38 * Static instruction class for no-ops. This is a leaf class.

--- 29 unchanged lines hidden (view full) ---

68 }
69
70 /// Helper function for decoding nops. Substitute Nop object
71 /// for original inst passed in as arg (and delete latter).
72 inline
73 MipsStaticInst *
74 makeNop(MipsStaticInst *inst)
75 {
76 MipsStaticInst *nop = new Nop(inst->disassemble(0), inst->machInst);
77 delete inst;
78 return nop;
79 }
80}};
81
82output exec {{
83 Fault
84 Nop::execute(%(CPU_exec_context)s *, Trace::InstRecord *) const
85 {
86 return NoFault;
87 }
88}};
89
90// integer & FP operate instructions use RT as dest, so check for
91// RT == 0 to detect nops
92def template OperateNopCheckDecode {{
93 {
94 MipsStaticInst *i = new %(class_name)s(machInst);
95
96 //if (RD == 0) {
97 // i = makeNop(i);
98 //}
99
100 return i;
101 }
102}};
103
104
105// Like BasicOperate format, but generates NOP if RC/FC == 31
106def format BasicOperateWithNopCheck(code, *opt_args) {{
107 iop = InstObjParams(name, Name, 'MipsStaticInst', CodeBlock(code),
108 opt_args)
109 header_output = BasicDeclare.subst(iop)
110 decoder_output = BasicConstructor.subst(iop)
111 decode_block = OperateNopCheckDecode.subst(iop)
112 exec_output = BasicExecute.subst(iop)
113}};
114
115def format Nop() {{
116 decode_block = 'return new Nop(\"\",machInst);\n'
117}};
118