mem.hh revision 6253:988a001820f8 
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    /// Pointer to EAComp object.
46    const StaticInstPtr eaCompPtr;
47    /// Pointer to MemAcc object.
48    const StaticInstPtr memAccPtr;
49
50    /// Displacement for EA calculation (signed).
51    int32_t disp;
52    int32_t disp8;
53    int32_t up;
54    int32_t hilo,
55            shift_size,
56            shift;
57
58    /// Constructor
59    Memory(const char *mnem, ExtMachInst _machInst, OpClass __opClass,
60           StaticInstPtr _eaCompPtr = nullStaticInstPtr,
61           StaticInstPtr _memAccPtr = nullStaticInstPtr)
62        : PredOp(mnem, _machInst, __opClass),
63                 memAccessFlags(0),
64                 eaCompPtr(_eaCompPtr), memAccPtr(_memAccPtr),
65                 disp(machInst.immed11_0),
66                 disp8(machInst.immed7_0 << 2),
67                 up(machInst.puswl.up),
68                 hilo((machInst.immedHi11_8 << 4) | machInst.immedLo3_0),
69                 shift_size(machInst.shiftSize), shift(machInst.shift)
70    {
71        // When Up is not set, then we must subtract by the displacement
72        if (!up)
73        {
74            disp = -disp;
75            disp8 = -disp8;
76            hilo = -hilo;
77        }
78    }
79
80    std::string
81    generateDisassembly(Addr pc, const SymbolTable *symtab) const;
82
83  public:
84
85    const StaticInstPtr &eaCompInst() const { return eaCompPtr; }
86    const StaticInstPtr &memAccInst() const { return memAccPtr; }
87};
88
89 /**
90 * Base class for a few miscellaneous memory-format insts
91 * that don't interpret the disp field
92 */
93class MemoryNoDisp : public Memory
94{
95  protected:
96    /// Constructor
97    MemoryNoDisp(const char *mnem, ExtMachInst _machInst, OpClass __opClass,
98                 StaticInstPtr _eaCompPtr = nullStaticInstPtr,
99                 StaticInstPtr _memAccPtr = nullStaticInstPtr)
100        : Memory(mnem, _machInst, __opClass, _eaCompPtr, _memAccPtr)
101    {
102    }
103
104    std::string
105    generateDisassembly(Addr pc, const SymbolTable *symtab) const;
106};
107}
108
109#endif //__ARCH_ARM_INSTS_MEM_HH__
110