pred_inst.hh revision 6306:fe1004d455b2 
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_INSTS_PREDINST_HH__
30#define __ARCH_ARM_INSTS_PREDINST_HH__
31
32#include "arch/arm/insts/static_inst.hh"
33#include "base/trace.hh"
34
35namespace ArmISA
36{
37static inline uint32_t
38rotate_imm(uint32_t immValue, int rotateValue)
39{
40    return ((immValue >> (rotateValue & 31)) |
41            (immValue << (32 - (rotateValue & 31))));
42}
43
44/**
45 * Base class for predicated integer operations.
46 */
47class PredOp : public ArmStaticInst
48{
49  protected:
50
51    ConditionCode condCode;
52
53    /// Constructor
54    PredOp(const char *mnem, MachInst _machInst, OpClass __opClass) :
55           ArmStaticInst(mnem, _machInst, __opClass),
56           condCode((ConditionCode)(unsigned)machInst.condCode)
57    {
58    }
59};
60
61/**
62 * Base class for predicated immediate operations.
63 */
64class PredImmOp : public PredOp
65{
66    protected:
67
68    uint32_t imm;
69    uint32_t rotate;
70    uint32_t rotated_imm;
71    uint32_t rotated_carry;
72
73    /// Constructor
74    PredImmOp(const char *mnem, MachInst _machInst, OpClass __opClass) :
75              PredOp(mnem, _machInst, __opClass),
76              imm(machInst.imm), rotate(machInst.rotate << 1),
77              rotated_imm(0), rotated_carry(0)
78    {
79        rotated_imm = rotate_imm(imm, rotate);
80        if (rotate != 0)
81            rotated_carry = (rotated_imm >> 31) & 1;
82    }
83
84    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
85};
86
87/**
88 * Base class for predicated integer operations.
89 */
90class PredIntOp : public PredOp
91{
92    protected:
93
94    uint32_t shift_size;
95    uint32_t shift;
96
97    /// Constructor
98    PredIntOp(const char *mnem, MachInst _machInst, OpClass __opClass) :
99              PredOp(mnem, _machInst, __opClass),
100              shift_size(machInst.shiftSize), shift(machInst.shift)
101    {
102    }
103
104    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
105};
106
107/**
108 * Base class for predicated macro-operations.
109 */
110class PredMacroOp : public PredOp
111{
112    protected:
113
114    uint32_t numMicroops;
115    StaticInstPtr * microOps;
116
117    /// Constructor
118    PredMacroOp(const char *mnem, MachInst _machInst, OpClass __opClass) :
119                PredOp(mnem, _machInst, __opClass),
120                numMicroops(0)
121    {
122        // We rely on the subclasses of this object to handle the
123        // initialization of the micro-operations, since they are
124        // all of variable length
125        flags[IsMacroop] = true;
126    }
127
128    ~PredMacroOp()
129    {
130        if (numMicroops)
131            delete [] microOps;
132    }
133
134    StaticInstPtr
135    fetchMicroop(MicroPC microPC)
136    {
137        assert(microPC < numMicroops);
138        return microOps[microPC];
139    }
140
141    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
142};
143
144/**
145 * Base class for predicated micro-operations.
146 */
147class PredMicroop : public PredOp
148{
149    /// Constructor
150    PredMicroop(const char *mnem, MachInst _machInst, OpClass __opClass) :
151                PredOp(mnem, _machInst, __opClass)
152    {
153        flags[IsMicroop] = true;
154    }
155};
156}
157
158#endif //__ARCH_ARM_INSTS_PREDINST_HH__
159