src/arch/arm/faults.hh

   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) 2003-2005 The Regents of The University of Michigan
  15  * Copyright (c) 2007-2008 The Florida State University
  16  * All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions are
  20  * met: redistributions of source code must retain the above copyright
  21  * notice, this list of conditions and the following disclaimer;
  22  * redistributions in binary form must reproduce the above copyright
  23  * notice, this list of conditions and the following disclaimer in the
  24  * documentation and/or other materials provided with the distribution;
  25  * neither the name of the copyright holders nor the names of its
  26  * contributors may be used to endorse or promote products derived from
  27  * this software without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  30  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  31  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  32  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  33  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  34  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  35  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  36  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  37  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  38  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  39  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  *
  41  * Authors: Ali Saidi
  42  *          Gabe Black
  43  */
  44
  45 #ifndef __ARM_FAULTS_HH__
  46 #define __ARM_FAULTS_HH__
  47
  48 #include "arch/arm/miscregs.hh"
  49 #include "arch/arm/types.hh"
  50 #include "config/full_system.hh"
  51 #include "sim/faults.hh"
  52 #include "base/misc.hh"
  53
  54 // The design of the "name" and "vect" functions is in sim/faults.hh
  55
  56 namespace ArmISA
  57 {
  58 typedef const Addr FaultOffset;
  59
  60 class ArmFault : public FaultBase
  61 {
  62   protected:
  63     Addr getVector(ThreadContext *tc);
  64
  65   public:
  66     enum StatusEncoding
  67     {
  68         // Fault Status register encodings
  69         // ARM ARM B3.9.4
  70         AlignmentFault = 0x1,
  71         DebugEvent = 0x2,
  72         AccessFlag0 = 0x3,
  73         InstructionCacheMaintenance = 0x4,
  74         Translation0 = 0x5,
  75         AccessFlag1 = 0x6,
  76         Translation1 = 0x7,
  77         SynchronousExternalAbort0 = 0x8,
  78         Domain0 = 0x9,
  79         SynchronousExternalAbort1 = 0x8,
  80         Domain1 = 0xb,
  81         TranslationTableWalkExtAbt0 = 0xc,
  82         Permission0 = 0xd,
  83         TranslationTableWalkExtAbt1 = 0xe,
  84         Permission1 = 0xf,
  85         AsynchronousExternalAbort = 0x16,
  86         MemoryAccessAsynchronousParityError = 0x18,
  87         MemoryAccessSynchronousParityError = 0x19,
  88         TranslationTableWalkPrtyErr0 = 0x1c,
  89         TranslationTableWalkPrtyErr1 = 0x1e,
  90
  91         // not a real fault. This is a status code
  92         // to allow the translation function to inform
  93         // the memory access function not to proceed
  94         // for a Prefetch that misses in the TLB.
  95         PrefetchTLBMiss = 0x1f,
  96         PrefetchUncacheable = 0x20
  97     };
  98
  99     struct FaultVals
 100     {
 101         const FaultName name;
 102         const FaultOffset offset;
 103         const OperatingMode nextMode;
 104         const uint8_t armPcOffset;
 105         const uint8_t thumbPcOffset;
 106         const bool abortDisable;
 107         const bool fiqDisable;
 108         FaultStat count;
 109     };
 110
 111 #if FULL_SYSTEM
 112     void invoke(ThreadContext *tc,
 113             StaticInstPtr inst = StaticInst::nullStaticInstPtr);
 114 #endif
 115     virtual FaultStat& countStat() = 0;
 116     virtual FaultOffset offset() = 0;
 117     virtual OperatingMode nextMode() = 0;
 118     virtual uint8_t armPcOffset() = 0;
 119     virtual uint8_t thumbPcOffset() = 0;
 120     virtual bool abortDisable() = 0;
 121     virtual bool fiqDisable() = 0;
 122 };
 123
 124 template<typename T>
 125 class ArmFaultVals : public ArmFault
 126 {
 127   protected:
 128     static FaultVals vals;
 129
 130   public:
 131     FaultName name() const { return vals.name; }
 132     FaultStat & countStat() {return vals.count;}
 133     FaultOffset offset() { return vals.offset; }
 134     OperatingMode nextMode() { return vals.nextMode; }
 135     uint8_t armPcOffset() { return vals.armPcOffset; }
 136     uint8_t thumbPcOffset() { return vals.thumbPcOffset; }
 137     bool abortDisable() { return vals.abortDisable; }
 138     bool fiqDisable() { return vals.fiqDisable; }
 139 };
 140
 141 class Reset : public ArmFaultVals<Reset>
 142 #if FULL_SYSTEM
 143 {
 144   public:
 145     void invoke(ThreadContext *tc,
 146             StaticInstPtr inst = StaticInst::nullStaticInstPtr);
 147 };
 148 #else
 149 {};
 150 #endif //FULL_SYSTEM
 151
 152 class UndefinedInstruction : public ArmFaultVals<UndefinedInstruction>
 153 {
 154 #if !FULL_SYSTEM
 155   protected:
 156     ExtMachInst machInst;
 157     bool unknown;
 158     const char *mnemonic;
 159     bool disabled;
 160
 161   public:
 162     UndefinedInstruction(ExtMachInst _machInst,
 163                          bool _unknown,
 164                          const char *_mnemonic = NULL,
 165                          bool _disabled = false) :
 166         machInst(_machInst), unknown(_unknown),
 167         mnemonic(_mnemonic), disabled(_disabled)
 168     {
 169     }
 170
 171     void invoke(ThreadContext *tc,
 172             StaticInstPtr inst = StaticInst::nullStaticInstPtr);
 173 #endif
 174 };
 175
 176 class SupervisorCall : public ArmFaultVals<SupervisorCall>
 177 {
 178 #if !FULL_SYSTEM
 179   protected:
 180     ExtMachInst machInst;
 181
 182   public:
 183     SupervisorCall(ExtMachInst _machInst) : machInst(_machInst)
 184     {}
 185
 186     void invoke(ThreadContext *tc,
 187             StaticInstPtr inst = StaticInst::nullStaticInstPtr);
 188 #endif
 189 };
 190
 191 template <class T>
 192 class AbortFault : public ArmFaultVals<T>
 193 {
 194   protected:
 195     Addr faultAddr;
 196     bool write;
 197     uint8_t domain;
 198     uint8_t status;
 199
 200   public:
 201     AbortFault(Addr _faultAddr, bool _write,
 202             uint8_t _domain, uint8_t _status) :
 203         faultAddr(_faultAddr), write(_write),
 204         domain(_domain), status(_status)
 205     {}
 206
 207     void invoke(ThreadContext *tc,
 208             StaticInstPtr inst = StaticInst::nullStaticInstPtr);
 209 };
 210
 211 class PrefetchAbort : public AbortFault<PrefetchAbort>
 212 {
 213   public:
 214     static const MiscRegIndex FsrIndex = MISCREG_IFSR;
 215     static const MiscRegIndex FarIndex = MISCREG_IFAR;
 216
 217     PrefetchAbort(Addr _addr, uint8_t _status) :
 218         AbortFault<PrefetchAbort>(_addr, false, 0, _status)
 219     {}
 220 };
 221
 222 class DataAbort : public AbortFault<DataAbort>
 223 {
 224   public:
 225     static const MiscRegIndex FsrIndex = MISCREG_DFSR;
 226     static const MiscRegIndex FarIndex = MISCREG_DFAR;
 227
 228     DataAbort(Addr _addr, uint8_t _domain, bool _write, uint8_t _status) :
 229         AbortFault<DataAbort>(_addr, _write, _domain, _status)
 230     {}
 231 };
 232
 233 class Interrupt : public ArmFaultVals<Interrupt> {};
 234 class FastInterrupt : public ArmFaultVals<FastInterrupt> {};
 235
 236 // A fault that flushes the pipe, excluding the faulting instructions
 237 class FlushPipe : public ArmFaultVals<FlushPipe>
 238 {
 239   public:
 240     FlushPipe() {}
 241     void invoke(ThreadContext *tc,
 242             StaticInstPtr inst = StaticInst::nullStaticInstPtr);
 243 };
 244
 245 static inline Fault genMachineCheckFault()
 246 {
 247     return new Reset();
 248 }
 249
 250 } // namespace ArmISA
 251
 252 #endif // __ARM_FAULTS_HH__