pred_inst.hh revision 7328:f45289e4f2f4 
1/*
2 * Copyright (c) 2010 ARM Limited
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 * Copyright (c) 2007-2008 The Florida State University
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Stephen Hines
41 */
42#ifndef __ARCH_ARM_INSTS_PREDINST_HH__
43#define __ARCH_ARM_INSTS_PREDINST_HH__
44
45#include "arch/arm/insts/static_inst.hh"
46#include "base/trace.hh"
47
48namespace ArmISA
49{
50static inline uint32_t
51rotate_imm(uint32_t immValue, int rotateValue)
52{
53    return ((immValue >> (rotateValue & 31)) |
54            (immValue << (32 - (rotateValue & 31))));
55}
56
57static inline uint32_t
58modified_imm(uint8_t ctrlImm, uint8_t dataImm)
59{
60    uint32_t bigData = dataImm;
61    uint32_t bigCtrl = ctrlImm;
62    if (bigCtrl < 4) {
63        switch (bigCtrl) {
64          case 0:
65            return bigData;
66          case 1:
67            return bigData | (bigData << 16);
68          case 2:
69            return (bigData << 8) | (bigData << 24);
70          case 3:
71            return (bigData << 0) | (bigData << 8) |
72                   (bigData << 16) | (bigData << 24);
73        }
74    }
75    bigCtrl = (bigCtrl << 1) | ((bigData >> 7) & 0x1);
76    bigData |= (1 << 7);
77    return bigData << (32 - bigCtrl);
78}
79
80static inline uint64_t
81simd_modified_imm(bool op, uint8_t cmode, uint8_t data)
82{
83    uint64_t bigData = data;
84    switch (cmode) {
85      case 0x0:
86      case 0x1:
87        bigData = (bigData << 0) | (bigData << 32);
88        break;
89      case 0x2:
90      case 0x3:
91        bigData = (bigData << 8) | (bigData << 40);
92        break;
93      case 0x4:
94      case 0x5:
95        bigData = (bigData << 16) | (bigData << 48);
96        break;
97      case 0x6:
98      case 0x7:
99        bigData = (bigData << 24) | (bigData << 56);
100        break;
101      case 0x8:
102      case 0x9:
103        bigData = (bigData << 0) | (bigData << 16) |
104                  (bigData << 32) | (bigData << 48);
105        break;
106      case 0xa:
107      case 0xb:
108        bigData = (bigData << 8) | (bigData << 24) |
109                  (bigData << 40) | (bigData << 56);
110        break;
111      case 0xc:
112        bigData = (0xffULL << 0) | (bigData << 8) |
113                  (0xffULL << 32) | (bigData << 40);
114        break;
115      case 0xd:
116        bigData = (0xffffULL << 0) | (bigData << 16) |
117                  (0xffffULL << 32) | (bigData << 48);
118        break;
119      case 0xe:
120        if (op) {
121            bigData = (bigData << 0)  | (bigData << 8)  |
122                      (bigData << 16) | (bigData << 24) |
123                      (bigData << 32) | (bigData << 40) |
124                      (bigData << 48) | (bigData << 56);
125        } else {
126            bigData = 0;
127            for (int i = 7; i >= 0; i--) {
128                if (bits(data, i)) {
129                    bigData |= (0xFF << (i * 8));
130                }
131            }
132        }
133      case 0xf:
134        if (!op) {
135            uint64_t bVal = bits(bigData, 6) ? (0x1F) : (0x20);
136            bigData = (bits(bigData, 5, 0) << 19) |
137                      (bVal << 25) | (bits(bigData, 7) << 31);
138            bigData |= (bigData << 32);
139        }
140        // Fall through
141      default:
142        panic("Illegal modified SIMD immediate parameters.\n");
143    }
144    return bigData;
145}
146
147
148/**
149 * Base class for predicated integer operations.
150 */
151class PredOp : public ArmStaticInst
152{
153  protected:
154
155    ConditionCode condCode;
156
157    /// Constructor
158    PredOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
159           ArmStaticInst(mnem, _machInst, __opClass),
160           condCode((ConditionCode)(unsigned)machInst.condCode)
161    {
162    }
163};
164
165/**
166 * Base class for predicated immediate operations.
167 */
168class PredImmOp : public PredOp
169{
170    protected:
171
172    uint32_t imm;
173    uint32_t rotated_imm;
174    uint32_t rotated_carry;
175    uint32_t rotate;
176
177    /// Constructor
178    PredImmOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
179              PredOp(mnem, _machInst, __opClass),
180              imm(machInst.imm), rotated_imm(0), rotated_carry(0),
181              rotate(machInst.rotate << 1)
182    {
183        rotated_imm = rotate_imm(imm, rotate);
184        if (rotate != 0)
185            rotated_carry = bits(rotated_imm, 31);
186    }
187
188    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
189};
190
191/**
192 * Base class for predicated integer operations.
193 */
194class PredIntOp : public PredOp
195{
196    protected:
197
198    uint32_t shift_size;
199    uint32_t shift;
200
201    /// Constructor
202    PredIntOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
203              PredOp(mnem, _machInst, __opClass),
204              shift_size(machInst.shiftSize), shift(machInst.shift)
205    {
206    }
207
208    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
209};
210
211class DataImmOp : public PredOp
212{
213  protected:
214    IntRegIndex dest, op1;
215    uint32_t imm;
216    // Whether the carry flag should be modified if that's an option for
217    // this instruction.
218    bool rotC;
219
220    DataImmOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass,
221              IntRegIndex _dest, IntRegIndex _op1, uint32_t _imm, bool _rotC) :
222        PredOp(mnem, _machInst, __opClass),
223        dest(_dest), op1(_op1), imm(_imm), rotC(_rotC)
224    {}
225
226    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
227};
228
229class DataRegOp : public PredOp
230{
231  protected:
232    IntRegIndex dest, op1, op2;
233    int32_t shiftAmt;
234    ArmShiftType shiftType;
235
236    DataRegOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass,
237              IntRegIndex _dest, IntRegIndex _op1, IntRegIndex _op2,
238              int32_t _shiftAmt, ArmShiftType _shiftType) :
239        PredOp(mnem, _machInst, __opClass),
240        dest(_dest), op1(_op1), op2(_op2),
241        shiftAmt(_shiftAmt), shiftType(_shiftType)
242    {}
243
244    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
245};
246
247class DataRegRegOp : public PredOp
248{
249  protected:
250    IntRegIndex dest, op1, op2, shift;
251    ArmShiftType shiftType;
252
253    DataRegRegOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass,
254                 IntRegIndex _dest, IntRegIndex _op1, IntRegIndex _op2,
255                 IntRegIndex _shift, ArmShiftType _shiftType) :
256        PredOp(mnem, _machInst, __opClass),
257        dest(_dest), op1(_op1), op2(_op2), shift(_shift),
258        shiftType(_shiftType)
259    {}
260
261    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
262};
263
264/**
265 * Base class for predicated macro-operations.
266 */
267class PredMacroOp : public PredOp
268{
269    protected:
270
271    uint32_t numMicroops;
272    StaticInstPtr * microOps;
273
274    /// Constructor
275    PredMacroOp(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
276                PredOp(mnem, _machInst, __opClass),
277                numMicroops(0)
278    {
279        // We rely on the subclasses of this object to handle the
280        // initialization of the micro-operations, since they are
281        // all of variable length
282        flags[IsMacroop] = true;
283    }
284
285    ~PredMacroOp()
286    {
287        if (numMicroops)
288            delete [] microOps;
289    }
290
291    StaticInstPtr
292    fetchMicroop(MicroPC microPC)
293    {
294        assert(microPC < numMicroops);
295        return microOps[microPC];
296    }
297
298    std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
299};
300
301/**
302 * Base class for predicated micro-operations.
303 */
304class PredMicroop : public PredOp
305{
306    /// Constructor
307    PredMicroop(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
308                PredOp(mnem, _machInst, __opClass)
309    {
310        flags[IsMicroop] = true;
311    }
312};
313}
314
315#endif //__ARCH_ARM_INSTS_PREDINST_HH__
316