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