microldstop.hh revision 7620:3d8a23caa1ef 
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                uint64_t setFlags,
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, setFlags, __opClass),
85                scale(_scale), index(_index.idx), base(_base.idx),
86                disp(_disp), segment(_segment.idx),
87                data(_data.idx),
88                dataSize(_dataSize), addressSize(_addressSize),
89                memFlags(_memFlags | _segment.idx)
90        {
91            assert(_segment.idx < NUM_SEGMENTREGS);
92            foldOBit = (dataSize == 1 && !_machInst.rex.present) ? 1 << 6 : 0;
93            foldABit =
94                (addressSize == 1 && !_machInst.rex.present) ? 1 << 6 : 0;
95        }
96
97        std::string generateDisassembly(Addr pc,
98            const SymbolTable *symtab) const;
99
100        template<class Context, class MemType>
101        Fault read(Context *xc, Addr EA, MemType & Mem, unsigned flags) const
102        {
103            Fault fault = NoFault;
104            switch(dataSize)
105            {
106              case 1:
107                fault = xc->read(EA, (uint8_t&)Mem, flags);
108                break;
109              case 2:
110                fault = xc->read(EA, (uint16_t&)Mem, flags);
111                break;
112              case 4:
113                fault = xc->read(EA, (uint32_t&)Mem, flags);
114                break;
115              case 8:
116                fault = xc->read(EA, (uint64_t&)Mem, flags);
117                break;
118              default:
119                panic("Bad operand size %d for read at %#x.\n", dataSize, EA);
120            }
121            return fault;
122        }
123
124        template<class Context, class MemType>
125        Fault write(Context *xc, MemType & Mem, Addr EA, unsigned flags) const
126        {
127            Fault fault = NoFault;
128            switch(dataSize)
129            {
130              case 1:
131                fault = xc->write((uint8_t&)Mem, EA, flags, 0);
132                break;
133              case 2:
134                fault = xc->write((uint16_t&)Mem, EA, flags, 0);
135                break;
136              case 4:
137                fault = xc->write((uint32_t&)Mem, EA, flags, 0);
138                break;
139              case 8:
140                fault = xc->write((uint64_t&)Mem, EA, flags, 0);
141                break;
142              default:
143                panic("Bad operand size %d for write at %#x.\n", dataSize, EA);
144            }
145            return fault;
146        }
147
148        uint64_t
149        get(PacketPtr pkt) const
150        {
151            switch(dataSize)
152            {
153              case 1:
154                return pkt->get<uint8_t>();
155              case 2:
156                return pkt->get<uint16_t>();
157              case 4:
158                return pkt->get<uint32_t>();
159              case 8:
160                return pkt->get<uint64_t>();
161              default:
162                panic("Bad operand size %d for read at %#x.\n",
163                        dataSize, pkt->getAddr());
164            }
165        }
166    };
167}
168
169#endif //__ARCH_X86_INSTS_MICROLDSTOP_HH__
170