isa.hh revision 6719 
1/*
2 * Copyright (c) 2009 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Gabe Black
29 */
30
31#ifndef __ARCH_ARM_ISA_HH__
32#define __ARCH_MRM_ISA_HH__
33
34#include "arch/arm/registers.hh"
35#include "arch/arm/types.hh"
36
37class ThreadContext;
38class Checkpoint;
39class EventManager;
40
41namespace ArmISA
42{
43    class ISA
44    {
45      protected:
46        MiscReg miscRegs[NumMiscRegs];
47        const IntRegIndex *intRegMap;
48
49        void
50        updateRegMap(CPSR cpsr)
51        {
52            switch (cpsr.mode) {
53              case MODE_USER:
54              case MODE_SYSTEM:
55                intRegMap = IntRegUsrMap;
56                break;
57              case MODE_FIQ:
58                intRegMap = IntRegFiqMap;
59                break;
60              case MODE_IRQ:
61                intRegMap = IntRegIrqMap;
62                break;
63              case MODE_SVC:
64                intRegMap = IntRegSvcMap;
65                break;
66              case MODE_ABORT:
67                intRegMap = IntRegAbtMap;
68                break;
69              case MODE_UNDEFINED:
70                intRegMap = IntRegUndMap;
71                break;
72              default:
73                panic("Unrecognized mode setting in CPSR.\n");
74            }
75        }
76
77      public:
78        void clear()
79        {
80            memset(miscRegs, 0, sizeof(miscRegs));
81            CPSR cpsr = 0;
82            cpsr.mode = MODE_USER;
83            miscRegs[MISCREG_CPSR] = cpsr;
84            updateRegMap(cpsr);
85            //XXX We need to initialize the rest of the state.
86        }
87
88        MiscReg
89        readMiscRegNoEffect(int misc_reg)
90        {
91            assert(misc_reg < NumMiscRegs);
92            return miscRegs[misc_reg];
93        }
94
95        MiscReg
96        readMiscReg(int misc_reg, ThreadContext *tc)
97        {
98            assert(misc_reg < NumMiscRegs);
99            return miscRegs[misc_reg];
100        }
101
102        void
103        setMiscRegNoEffect(int misc_reg, const MiscReg &val)
104        {
105            assert(misc_reg < NumMiscRegs);
106            miscRegs[misc_reg] = val;
107        }
108
109        void
110        setMiscReg(int misc_reg, const MiscReg &val, ThreadContext *tc)
111        {
112            if (misc_reg == MISCREG_CPSR) {
113                updateRegMap(val);
114            }
115            assert(misc_reg < NumMiscRegs);
116            miscRegs[misc_reg] = val;
117        }
118
119        int
120        flattenIntIndex(int reg)
121        {
122            assert(reg >= 0);
123            if (reg < NUM_ARCH_INTREGS) {
124                return intRegMap[reg];
125            } else {
126                assert(reg < NUM_INTREGS);
127                return reg;
128            }
129        }
130
131        int
132        flattenFloatIndex(int reg)
133        {
134            return reg;
135        }
136
137        void serialize(EventManager *em, std::ostream &os)
138        {}
139        void unserialize(EventManager *em, Checkpoint *cp,
140                const std::string &section)
141        {}
142
143        ISA()
144        {
145            clear();
146        }
147    };
148}
149
150#endif
151