1/*
2 * Copyright (c) 2012 Google
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Gabe Black
29 */
30
31#ifndef __ARCH_MIPS_DECODER_HH__
32#define __ARCH_MIPS_DECODER_HH__
33
34#include "arch/generic/decode_cache.hh"
35#include "arch/mips/types.hh"
36#include "base/misc.hh"
37#include "base/types.hh"
38#include "cpu/static_inst.hh"
39
40namespace MipsISA
41{
42
43class Decoder
44{
45 protected:
46 //The extended machine instruction being generated
47 ExtMachInst emi;
48 bool instDone;
49
50 public:
51 Decoder() : instDone(false)
52 {}
53
54 void
55 process()
56 {
57 }
58
59 void
60 reset()
61 {
62 instDone = false;
63 }
64
65 //Use this to give data to the decoder. This should be used
66 //when there is control flow.
67 void
68 moreBytes(const PCState &pc, Addr fetchPC, MachInst inst)
69 {
70 emi = inst;
71 instDone = true;
72 }
73
74 bool
75 needMoreBytes()
76 {
77 return true;
78 }
79
80 bool
81 instReady()
82 {
83 return instDone;
84 }
85
| 1/*
2 * Copyright (c) 2012 Google
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Gabe Black
29 */
30
31#ifndef __ARCH_MIPS_DECODER_HH__
32#define __ARCH_MIPS_DECODER_HH__
33
34#include "arch/generic/decode_cache.hh"
35#include "arch/mips/types.hh"
36#include "base/misc.hh"
37#include "base/types.hh"
38#include "cpu/static_inst.hh"
39
40namespace MipsISA
41{
42
43class Decoder
44{
45 protected:
46 //The extended machine instruction being generated
47 ExtMachInst emi;
48 bool instDone;
49
50 public:
51 Decoder() : instDone(false)
52 {}
53
54 void
55 process()
56 {
57 }
58
59 void
60 reset()
61 {
62 instDone = false;
63 }
64
65 //Use this to give data to the decoder. This should be used
66 //when there is control flow.
67 void
68 moreBytes(const PCState &pc, Addr fetchPC, MachInst inst)
69 {
70 emi = inst;
71 instDone = true;
72 }
73
74 bool
75 needMoreBytes()
76 {
77 return true;
78 }
79
80 bool
81 instReady()
82 {
83 return instDone;
84 }
85
|
86 protected:
87 /// A cache of decoded instruction objects.
88 static GenericISA::BasicDecodeCache defaultCache;
89
90 public:
91 StaticInstPtr decodeInst(ExtMachInst mach_inst);
92
93 /// Decode a machine instruction.
94 /// @param mach_inst The binary instruction to decode.
95 /// @retval A pointer to the corresponding StaticInst object.
96 StaticInstPtr
97 decode(ExtMachInst mach_inst, Addr addr)
98 {
99 return defaultCache.decode(this, mach_inst, addr);
100 }
101
102 StaticInstPtr
103 decode(MipsISA::PCState &nextPC)
104 {
105 if (!instDone)
106 return NULL;
107 instDone = false;
108 return decode(emi, nextPC.instAddr());
109 }
110};
111
112} // namespace MipsISA
113
114#endif // __ARCH_MIPS_DECODER_HH__
| 88 protected:
89 /// A cache of decoded instruction objects.
90 static GenericISA::BasicDecodeCache defaultCache;
91
92 public:
93 StaticInstPtr decodeInst(ExtMachInst mach_inst);
94
95 /// Decode a machine instruction.
96 /// @param mach_inst The binary instruction to decode.
97 /// @retval A pointer to the corresponding StaticInst object.
98 StaticInstPtr
99 decode(ExtMachInst mach_inst, Addr addr)
100 {
101 return defaultCache.decode(this, mach_inst, addr);
102 }
103
104 StaticInstPtr
105 decode(MipsISA::PCState &nextPC)
106 {
107 if (!instDone)
108 return NULL;
109 instDone = false;
110 return decode(emi, nextPC.instAddr());
111 }
112};
113
114} // namespace MipsISA
115
116#endif // __ARCH_MIPS_DECODER_HH__
|