isa.hh revision 9920 
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) 2009 The Regents of The University of Michigan
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: Gabe Black
41 */
42
43#ifndef __ARCH_ARM_ISA_HH__
44#define __ARCH_ARM_ISA_HH__
45
46#include "arch/arm/registers.hh"
47#include "arch/arm/tlb.hh"
48#include "arch/arm/types.hh"
49#include "debug/Checkpoint.hh"
50#include "sim/sim_object.hh"
51
52struct ArmISAParams;
53class ThreadContext;
54class Checkpoint;
55class EventManager;
56
57namespace ArmISA
58{
59    class ISA : public SimObject
60    {
61      protected:
62        MiscReg miscRegs[NumMiscRegs];
63        const IntRegIndex *intRegMap;
64
65        void
66        updateRegMap(CPSR cpsr)
67        {
68            switch (cpsr.mode) {
69              case MODE_USER:
70              case MODE_SYSTEM:
71                intRegMap = IntRegUsrMap;
72                break;
73              case MODE_FIQ:
74                intRegMap = IntRegFiqMap;
75                break;
76              case MODE_IRQ:
77                intRegMap = IntRegIrqMap;
78                break;
79              case MODE_SVC:
80                intRegMap = IntRegSvcMap;
81                break;
82              case MODE_MON:
83                intRegMap = IntRegMonMap;
84                break;
85              case MODE_ABORT:
86                intRegMap = IntRegAbtMap;
87                break;
88              case MODE_UNDEFINED:
89                intRegMap = IntRegUndMap;
90                break;
91              default:
92                panic("Unrecognized mode setting in CPSR.\n");
93            }
94        }
95
96      public:
97        void clear();
98
99        MiscReg readMiscRegNoEffect(int misc_reg);
100        MiscReg readMiscReg(int misc_reg, ThreadContext *tc);
101        void setMiscRegNoEffect(int misc_reg, const MiscReg &val);
102        void setMiscReg(int misc_reg, const MiscReg &val, ThreadContext *tc);
103
104        int
105        flattenIntIndex(int reg)
106        {
107            assert(reg >= 0);
108            if (reg < NUM_ARCH_INTREGS) {
109                return intRegMap[reg];
110            } else if (reg < NUM_INTREGS) {
111                return reg;
112            } else {
113                int mode = reg / intRegsPerMode;
114                reg = reg % intRegsPerMode;
115                switch (mode) {
116                  case MODE_USER:
117                  case MODE_SYSTEM:
118                    return INTREG_USR(reg);
119                  case MODE_FIQ:
120                    return INTREG_FIQ(reg);
121                  case MODE_IRQ:
122                    return INTREG_IRQ(reg);
123                  case MODE_SVC:
124                    return INTREG_SVC(reg);
125                  case MODE_MON:
126                    return INTREG_MON(reg);
127                  case MODE_ABORT:
128                    return INTREG_ABT(reg);
129                  case MODE_UNDEFINED:
130                    return INTREG_UND(reg);
131                  default:
132                    panic("Flattening into an unknown mode.\n");
133                }
134            }
135        }
136
137        int
138        flattenFloatIndex(int reg)
139        {
140            return reg;
141        }
142
143        // dummy
144        int
145        flattenCCIndex(int reg)
146        {
147            return reg;
148        }
149
150        int
151        flattenMiscIndex(int reg)
152        {
153            if (reg == MISCREG_SPSR) {
154                int spsr_idx = NUM_MISCREGS;
155                CPSR cpsr = miscRegs[MISCREG_CPSR];
156                switch (cpsr.mode) {
157                  case MODE_USER:
158                    warn("User mode does not have SPSR\n");
159                    spsr_idx = MISCREG_SPSR;
160                    break;
161                  case MODE_FIQ:
162                    spsr_idx = MISCREG_SPSR_FIQ;
163                    break;
164                  case MODE_IRQ:
165                    spsr_idx = MISCREG_SPSR_IRQ;
166                    break;
167                  case MODE_SVC:
168                    spsr_idx = MISCREG_SPSR_SVC;
169                    break;
170                  case MODE_MON:
171                    spsr_idx = MISCREG_SPSR_MON;
172                    break;
173                  case MODE_ABORT:
174                    spsr_idx = MISCREG_SPSR_ABT;
175                    break;
176                  case MODE_UNDEFINED:
177                    spsr_idx = MISCREG_SPSR_UND;
178                    break;
179                  default:
180                    warn("Trying to access SPSR in an invalid mode: %d\n",
181                         cpsr.mode);
182                    spsr_idx = MISCREG_SPSR;
183                    break;
184                }
185                return spsr_idx;
186            }
187            return reg;
188        }
189
190        void serialize(std::ostream &os)
191        {
192            DPRINTF(Checkpoint, "Serializing Arm Misc Registers\n");
193            SERIALIZE_ARRAY(miscRegs, NumMiscRegs);
194        }
195        void unserialize(Checkpoint *cp, const std::string &section)
196        {
197            DPRINTF(Checkpoint, "Unserializing Arm Misc Registers\n");
198            UNSERIALIZE_ARRAY(miscRegs, NumMiscRegs);
199            CPSR tmp_cpsr = miscRegs[MISCREG_CPSR];
200            updateRegMap(tmp_cpsr);
201        }
202
203        void startup(ThreadContext *tc) {}
204
205        /// Explicitly import the otherwise hidden startup
206        using SimObject::startup;
207
208        typedef ArmISAParams Params;
209
210        const Params *params() const;
211
212        ISA(Params *p);
213    };
214}
215
216#endif
217