arch/alpha/isa_traits.hh

   1 /*
   2  * Copyright (c) 2003-2004 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
  29 #ifndef __ARCH_ALPHA_ISA_TRAITS_HH__
  30 #define __ARCH_ALPHA_ISA_TRAITS_HH__
  31
  32 #include "arch/alpha/faults.hh"
  33 #include "base/misc.hh"
  34 #include "sim/host.hh"
  35
  36 class FastCPU;
  37 class FullCPU;
  38 class Checkpoint;
  39
  40 #define TARGET_ALPHA
  41
  42 template <class ISA> class StaticInst;
  43 template <class ISA> class StaticInstPtr;
  44
  45 namespace EV5 {
  46 int DTB_ASN_ASN(uint64_t reg);
  47 int ITB_ASN_ASN(uint64_t reg);
  48 }
  49
  50 class AlphaISA
  51 {
  52   public:
  53
  54     typedef uint32_t MachInst;
  55     typedef uint64_t Addr;
  56     typedef uint8_t  RegIndex;
  57
  58     enum {
  59         MemoryEnd = 0xffffffffffffffffULL,
  60
  61         NumIntRegs = 32,
  62         NumFloatRegs = 32,
  63         NumMiscRegs = 32,
  64
  65         MaxRegsOfAnyType = 32,
  66         // Static instruction parameters
  67         MaxInstSrcRegs = 3,
  68         MaxInstDestRegs = 2,
  69
  70         // semantically meaningful register indices
  71         ZeroReg = 31,   // architecturally meaningful
  72         // the rest of these depend on the ABI
  73         StackPointerReg = 30,
  74         GlobalPointerReg = 29,
  75         ReturnAddressReg = 26,
  76         ReturnValueReg = 0,
  77         ArgumentReg0 = 16,
  78         ArgumentReg1 = 17,
  79         ArgumentReg2 = 18,
  80         ArgumentReg3 = 19,
  81         ArgumentReg4 = 20,
  82         ArgumentReg5 = 21,
  83
  84         LogVMPageSize = 13,     // 8K bytes
  85         VMPageSize = (1 << LogVMPageSize),
  86
  87         BranchPredAddrShiftAmt = 2, // instructions are 4-byte aligned
  88
  89         WordBytes = 4,
  90         HalfwordBytes = 2,
  91         ByteBytes = 1,
  92         DepNA = 0,
  93     };
  94
  95     // These enumerate all the registers for dependence tracking.
  96     enum DependenceTags {
  97         // 0..31 are the integer regs 0..31
  98         // 32..63 are the FP regs 0..31, i.e. use (reg + FP_Base_DepTag)
  99         FP_Base_DepTag = 32,
 100         Ctrl_Base_DepTag = 64,
 101         Fpcr_DepTag = 64,               // floating point control register
 102         Uniq_DepTag = 65,
 103         IPR_Base_DepTag = 66
 104     };
 105
 106     typedef uint64_t IntReg;
 107     typedef IntReg IntRegFile[NumIntRegs];
 108
 109     // floating point register file entry type
 110     typedef union {
 111         uint64_t q;
 112         double d;
 113     } FloatReg;
 114
 115     typedef union {
 116         uint64_t q[NumFloatRegs];       // integer qword view
 117         double d[NumFloatRegs];         // double-precision floating point view
 118     } FloatRegFile;
 119
 120     // control register file contents
 121     typedef uint64_t MiscReg;
 122     typedef struct {
 123         uint64_t        fpcr;           // floating point condition codes
 124         uint64_t        uniq;           // process-unique register
 125         bool            lock_flag;      // lock flag for LL/SC
 126         Addr            lock_addr;      // lock address for LL/SC
 127     } MiscRegFile;
 128
 129 static const Addr PageShift = 13;
 130 static const Addr PageBytes = ULL(1) << PageShift;
 131 static const Addr PageMask = ~(PageBytes - 1);
 132 static const Addr PageOffset = PageBytes - 1;
 133
 134 #ifdef FULL_SYSTEM
 135
 136     typedef uint64_t InternalProcReg;
 137
 138 #include "arch/alpha/isa_fullsys_traits.hh"
 139
 140 #else
 141     enum {
 142         NumInternalProcRegs = 0
 143     };
 144 #endif
 145
 146     enum {
 147         TotalNumRegs =
 148         NumIntRegs + NumFloatRegs + NumMiscRegs + NumInternalProcRegs
 149     };
 150
 151     typedef union {
 152         IntReg  intreg;
 153         FloatReg   fpreg;
 154         MiscReg ctrlreg;
 155     } AnyReg;
 156
 157     struct RegFile {
 158         IntRegFile intRegFile;          // (signed) integer register file
 159         FloatRegFile floatRegFile;      // floating point register file
 160         MiscRegFile miscRegs;           // control register file
 161         Addr pc;                        // program counter
 162         Addr npc;                       // next-cycle program counter
 163 #ifdef FULL_SYSTEM
 164         IntReg palregs[NumIntRegs];     // PAL shadow registers
 165         InternalProcReg ipr[NumInternalProcRegs]; // internal processor regs
 166         int intrflag;                   // interrupt flag
 167         bool pal_shadow;                // using pal_shadow registers
 168         inline int instAsid() { return EV5::ITB_ASN_ASN(ipr[IPR_ITB_ASN]); }
 169         inline int dataAsid() { return EV5::DTB_ASN_ASN(ipr[IPR_DTB_ASN]); }
 170 #endif // FULL_SYSTEM
 171
 172         void serialize(std::ostream &os);
 173         void unserialize(Checkpoint *cp, const std::string &section);
 174     };
 175
 176     static StaticInstPtr<AlphaISA> decodeInst(MachInst);
 177
 178     enum annotes {
 179         ANNOTE_NONE = 0,
 180         // An impossible number for instruction annotations
 181         ITOUCH_ANNOTE = 0xffffffff,
 182     };
 183
 184     static inline bool isCallerSaveIntegerRegister(unsigned int reg) {
 185         panic("register classification not implemented");
 186         return (reg >= 1 && reg <= 8 || reg >= 22 && reg <= 25 || reg == 27);
 187     }
 188
 189     static inline bool isCalleeSaveIntegerRegister(unsigned int reg) {
 190         panic("register classification not implemented");
 191         return (reg >= 9 && reg <= 15);
 192     }
 193
 194     static inline bool isCallerSaveFloatRegister(unsigned int reg) {
 195         panic("register classification not implemented");
 196         return false;
 197     }
 198
 199     static inline bool isCalleeSaveFloatRegister(unsigned int reg) {
 200         panic("register classification not implemented");
 201         return false;
 202     }
 203
 204     static inline Addr alignAddress(const Addr &addr,
 205                                          unsigned int nbytes) {
 206         return (addr & ~(nbytes - 1));
 207     }
 208
 209     // Instruction address compression hooks
 210     static inline Addr realPCToFetchPC(const Addr &addr) {
 211         return addr;
 212     }
 213
 214     static inline Addr fetchPCToRealPC(const Addr &addr) {
 215         return addr;
 216     }
 217
 218     // the size of "fetched" instructions (not necessarily the size
 219     // of real instructions for PISA)
 220     static inline size_t fetchInstSize() {
 221         return sizeof(MachInst);
 222     }
 223
 224     static inline MachInst makeRegisterCopy(int dest, int src) {
 225         panic("makeRegisterCopy not implemented");
 226         return 0;
 227     }
 228
 229     // Machine operations
 230
 231     static void saveMachineReg(AnyReg &savereg, const RegFile &reg_file,
 232                                int regnum);
 233
 234     static void restoreMachineReg(RegFile &regs, const AnyReg &reg,
 235                                   int regnum);
 236
 237 #if 0
 238     static void serializeSpecialRegs(const Serializable::Proxy &proxy,
 239                                      const RegFile &regs);
 240
 241     static void unserializeSpecialRegs(const IniFile *db,
 242                                        const std::string &category,
 243                                        ConfigNode *node,
 244                                        RegFile &regs);
 245 #endif
 246
 247     /**
 248      * Function to insure ISA semantics about 0 registers.
 249      * @param xc The execution context.
 250      */
 251     template <class XC>
 252     static void zeroRegisters(XC *xc);
 253 };
 254
 255
 256 typedef AlphaISA TheISA;
 257
 258 typedef TheISA::MachInst MachInst;
 259 typedef TheISA::Addr Addr;
 260 typedef TheISA::RegIndex RegIndex;
 261 typedef TheISA::IntReg IntReg;
 262 typedef TheISA::IntRegFile IntRegFile;
 263 typedef TheISA::FloatReg FloatReg;
 264 typedef TheISA::FloatRegFile FloatRegFile;
 265 typedef TheISA::MiscReg MiscReg;
 266 typedef TheISA::MiscRegFile MiscRegFile;
 267 typedef TheISA::AnyReg AnyReg;
 268 typedef TheISA::RegFile RegFile;
 269
 270 const int NumIntRegs   = TheISA::NumIntRegs;
 271 const int NumFloatRegs = TheISA::NumFloatRegs;
 272 const int NumMiscRegs  = TheISA::NumMiscRegs;
 273 const int TotalNumRegs = TheISA::TotalNumRegs;
 274 const int VMPageSize   = TheISA::VMPageSize;
 275 const int LogVMPageSize   = TheISA::LogVMPageSize;
 276 const int ZeroReg = TheISA::ZeroReg;
 277 const int StackPointerReg = TheISA::StackPointerReg;
 278 const int GlobalPointerReg = TheISA::GlobalPointerReg;
 279 const int ReturnAddressReg = TheISA::ReturnAddressReg;
 280 const int ReturnValueReg = TheISA::ReturnValueReg;
 281 const int ArgumentReg0 = TheISA::ArgumentReg0;
 282 const int ArgumentReg1 = TheISA::ArgumentReg1;
 283 const int BranchPredAddrShiftAmt = TheISA::BranchPredAddrShiftAmt;
 284 const int MaxAddr = (Addr)-1;
 285
 286 #ifdef FULL_SYSTEM
 287 typedef TheISA::InternalProcReg InternalProcReg;
 288 const int NumInternalProcRegs  = TheISA::NumInternalProcRegs;
 289 const int NumInterruptLevels = TheISA::NumInterruptLevels;
 290
 291 #include "arch/alpha/ev5.hh"
 292 #endif
 293
 294 #endif // __ARCH_ALPHA_ISA_TRAITS_HH__