microldstop.hh revision 7087 
1/*
2 * Copyright (c) 2007 The Hewlett-Packard Development Company
3 * All rights reserved.
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Gabe Black
38 */
39
40#ifndef __ARCH_X86_INSTS_MICROLDSTOP_HH__
41#define __ARCH_X86_INSTS_MICROLDSTOP_HH__
42
43#include "arch/x86/insts/microop.hh"
44#include "mem/packet.hh"
45#include "mem/request.hh"
46
47namespace X86ISA
48{
49    const Request::FlagsType SegmentFlagMask = mask(4);
50    const int FlagShift = 4;
51    enum FlagBit {
52        CPL0FlagBit = 1,
53        AddrSizeFlagBit = 2,
54        StoreCheck = 4
55    };
56
57    /**
58     * Base class for load and store ops
59     */
60    class LdStOp : public X86MicroopBase
61    {
62      protected:
63        const uint8_t scale;
64        const RegIndex index;
65        const RegIndex base;
66        const uint64_t disp;
67        const uint8_t segment;
68        const RegIndex data;
69        const uint8_t dataSize;
70        const uint8_t addressSize;
71        const Request::FlagsType memFlags;
72        RegIndex foldOBit, foldABit;
73
74        //Constructor
75        LdStOp(ExtMachInst _machInst,
76                const char * mnem, const char * _instMnem,
77                bool isMicro, bool isDelayed, bool isFirst, bool isLast,
78                uint8_t _scale, InstRegIndex _index, InstRegIndex _base,
79                uint64_t _disp, InstRegIndex _segment,
80                InstRegIndex _data,
81                uint8_t _dataSize, uint8_t _addressSize,
82                Request::FlagsType _memFlags,
83                OpClass __opClass) :
84        X86MicroopBase(machInst, mnem, _instMnem,
85                isMicro, isDelayed, isFirst, isLast, __opClass),
86                scale(_scale), index(_index.idx), base(_base.idx),
87                disp(_disp), segment(_segment.idx),
88                data(_data.idx),
89                dataSize(_dataSize), addressSize(_addressSize),
90                memFlags(_memFlags | _segment.idx)
91        {
92            assert(_segment.idx < NUM_SEGMENTREGS);
93            foldOBit = (dataSize == 1 && !_machInst.rex.present) ? 1 << 6 : 0;
94            foldABit =
95                (addressSize == 1 && !_machInst.rex.present) ? 1 << 6 : 0;
96        }
97
98        std::string generateDisassembly(Addr pc,
99            const SymbolTable *symtab) const;
100
101        template<class Context, class MemType>
102        Fault read(Context *xc, Addr EA, MemType & Mem, unsigned flags) const
103        {
104            Fault fault = NoFault;
105            switch(dataSize)
106            {
107              case 1:
108                fault = xc->read(EA, (uint8_t&)Mem, flags);
109                break;
110              case 2:
111                fault = xc->read(EA, (uint16_t&)Mem, flags);
112                break;
113              case 4:
114                fault = xc->read(EA, (uint32_t&)Mem, flags);
115                break;
116              case 8:
117                fault = xc->read(EA, (uint64_t&)Mem, flags);
118                break;
119              default:
120                panic("Bad operand size %d for read at %#x.\n", dataSize, EA);
121            }
122            return fault;
123        }
124
125        template<class Context, class MemType>
126        Fault write(Context *xc, MemType & Mem, Addr EA, unsigned flags) const
127        {
128            Fault fault = NoFault;
129            switch(dataSize)
130            {
131              case 1:
132                fault = xc->write((uint8_t&)Mem, EA, flags, 0);
133                break;
134              case 2:
135                fault = xc->write((uint16_t&)Mem, EA, flags, 0);
136                break;
137              case 4:
138                fault = xc->write((uint32_t&)Mem, EA, flags, 0);
139                break;
140              case 8:
141                fault = xc->write((uint64_t&)Mem, EA, flags, 0);
142                break;
143              default:
144                panic("Bad operand size %d for write at %#x.\n", dataSize, EA);
145            }
146            return fault;
147        }
148
149        uint64_t
150        get(PacketPtr pkt) const
151        {
152            switch(dataSize)
153            {
154              case 1:
155                return pkt->get<uint8_t>();
156              case 2:
157                return pkt->get<uint16_t>();
158              case 4:
159                return pkt->get<uint32_t>();
160              case 8:
161                return pkt->get<uint64_t>();
162              default:
163                panic("Bad operand size %d for read at %#x.\n",
164                        dataSize, pkt->getAddr());
165            }
166        }
167    };
168}
169
170#endif //__ARCH_X86_INSTS_MICROLDSTOP_HH__
171