mem.hh revision 6307:067515d22824 
1/* Copyright (c) 2007-2008 The Florida State University
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 *
27 * Authors: Stephen Hines
28 */
29#ifndef __ARCH_ARM_MEM_HH__
30#define __ARCH_ARM_MEM_HH__
31
32#include "arch/arm/insts/pred_inst.hh"
33
34namespace ArmISA
35{
36/**
37 * Base class for general Arm memory-format instructions.
38 */
39class Memory : public PredOp
40{
41  protected:
42
43    /// Memory request flags.  See mem_req_base.hh.
44    unsigned memAccessFlags;
45
46    /// Displacement for EA calculation (signed).
47    int32_t disp;
48    int32_t disp8;
49    int32_t up;
50    int32_t hilo,
51            shift_size,
52            shift;
53
54    /// Constructor
55    Memory(const char *mnem, ExtMachInst _machInst, OpClass __opClass)
56        : PredOp(mnem, _machInst, __opClass),
57                 memAccessFlags(0),
58                 disp(machInst.immed11_0),
59                 disp8(machInst.immed7_0 << 2),
60                 up(machInst.puswl.up),
61                 hilo((machInst.immedHi11_8 << 4) | machInst.immedLo3_0),
62                 shift_size(machInst.shiftSize), shift(machInst.shift)
63    {
64    }
65
66    std::string
67    generateDisassembly(Addr pc, const SymbolTable *symtab) const;
68
69    virtual void
70    printOffset(std::ostream &os) const
71    {}
72};
73
74class MemoryDisp : public Memory
75{
76  protected:
77    /// Constructor
78    MemoryDisp(const char *mnem, ExtMachInst _machInst, OpClass __opClass)
79        : Memory(mnem, _machInst, __opClass)
80    {
81    }
82
83    void
84    printOffset(std::ostream &os) const
85    {
86        ccprintf(os, "#%#x", (machInst.puswl.up ? disp : -disp));
87    }
88};
89
90class MemoryHilo : public Memory
91{
92  protected:
93    /// Constructor
94    MemoryHilo(const char *mnem, ExtMachInst _machInst, OpClass __opClass)
95        : Memory(mnem, _machInst, __opClass)
96    {
97    }
98
99    void
100    printOffset(std::ostream &os) const
101    {
102        ccprintf(os, "#%#x", (machInst.puswl.up ? hilo : -hilo));
103    }
104};
105
106class MemoryShift : public Memory
107{
108  protected:
109    /// Constructor
110    MemoryShift(const char *mnem, ExtMachInst _machInst, OpClass __opClass)
111        : Memory(mnem, _machInst, __opClass)
112    {
113    }
114
115    void
116    printOffset(std::ostream &os) const
117    {
118        printShiftOperand(os);
119    }
120};
121
122class MemoryReg : public Memory
123{
124  protected:
125    /// Constructor
126    MemoryReg(const char *mnem, ExtMachInst _machInst, OpClass __opClass)
127        : Memory(mnem, _machInst, __opClass)
128    {
129    }
130
131    void
132    printOffset(std::ostream &os) const
133    {
134        os << (machInst.puswl.up ? "+ " : "- ");
135        printReg(os, machInst.rm);
136    }
137};
138}
139
140#endif //__ARCH_ARM_INSTS_MEM_HH__
141