src/arch/power/insts/integer.hh

   1 /*
   2  * Copyright (c) 2009 The University of Edinburgh
   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: Timothy M. Jones
  29  */
  30
  31 #ifndef __ARCH_POWER_INSTS_INTEGER_HH__
  32 #define __ARCH_POWER_INSTS_INTEGER_HH__
  33
  34 #include "arch/power/insts/static_inst.hh"
  35 #include "base/cprintf.hh"
  36 #include "base/bitfield.hh"
  37
  38 namespace PowerISA
  39 {
  40
  41 /**
  42  * We provide a base class for integer operations and then inherit for
  43  * several other classes. These specialise for instructions using immediate
  44  * values and also rotate instructions. We also need to have versions that
  45  * consider the Rc and OE bits.
  46  */
  47
  48 /**
  49  * Base class for integer operations.
  50  */
  51 class IntOp : public PowerStaticInst
  52 {
  53   protected:
  54
  55     bool rcSet;
  56     bool oeSet;
  57
  58     // Needed for srawi only
  59     uint32_t sh;
  60
  61     /// Constructor
  62     IntOp(const char *mnem, MachInst _machInst, OpClass __opClass)
  63       : PowerStaticInst(mnem, _machInst, __opClass),
  64         rcSet(false), oeSet(false)
  65     {
  66     }
  67
  68     /* Compute the CR (condition register) field using signed comparison */
  69     inline uint32_t
  70     makeCRField(int32_t a, int32_t b, uint32_t xerSO) const
  71     {
  72         uint32_t c = xerSO;
  73
  74         /* We've pre-shifted the immediate values here */
  75         if (a < b)      { c += 0x8; }
  76         else if (a > b) { c += 0x4; }
  77         else            { c += 0x2; }
  78         return c;
  79     }
  80
  81     /* Compute the CR (condition register) field using unsigned comparison */
  82     inline uint32_t
  83     makeCRField(uint32_t a, uint32_t b, uint32_t xerSO) const
  84     {
  85         uint32_t c = xerSO;
  86
  87         /* We've pre-shifted the immediate values here */
  88         if (a < b)      { c += 0x8; }
  89         else if (a > b) { c += 0x4; }
  90         else            { c += 0x2; }
  91         return c;
  92     }
  93
  94     std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
  95 };
  96
  97
  98 /**
  99  * Class for integer immediate (signed and unsigned) operations.
 100  */
 101 class IntImmOp : public IntOp
 102 {
 103   protected:
 104
 105     int32_t imm;
 106     uint32_t uimm;
 107
 108     /// Constructor
 109     IntImmOp(const char *mnem, MachInst _machInst, OpClass __opClass)
 110       : IntOp(mnem, _machInst, __opClass),
 111         imm(sext<16>(machInst.si)),
 112         uimm(machInst.si)
 113     {
 114     }
 115
 116     std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
 117 };
 118
 119
 120 /**
 121  * Class for integer operations with a shift.
 122  */
 123 class IntShiftOp : public IntOp
 124 {
 125   protected:
 126
 127     uint32_t sh;
 128
 129     /// Constructor
 130     IntShiftOp(const char *mnem, MachInst _machInst, OpClass __opClass)
 131       : IntOp(mnem, _machInst, __opClass),
 132         sh(machInst.sh)
 133     {
 134     }
 135
 136     std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
 137 };
 138
 139
 140 /**
 141  * Class for integer rotate operations.
 142  */
 143 class IntRotateOp : public IntShiftOp
 144 {
 145   protected:
 146
 147     uint32_t mb;
 148     uint32_t me;
 149     uint32_t fullMask;
 150
 151     /// Constructor
 152     IntRotateOp(const char *mnem, MachInst _machInst, OpClass __opClass)
 153       : IntShiftOp(mnem, _machInst, __opClass),
 154         mb(machInst.mb),
 155         me(machInst.me)
 156     {
 157         if (me >= mb) {
 158             fullMask = mask(31 - mb, 31 - me);
 159         } else {
 160             fullMask = ~mask(31 - (me + 1), 31 - (mb - 1));
 161         }
 162     }
 163
 164     uint32_t
 165     rotateValue(uint32_t rs, uint32_t shift) const
 166     {
 167         uint32_t n = shift & 31;
 168         return (rs << n) | (rs >> (32 - n));
 169     }
 170
 171     std::string generateDisassembly(Addr pc, const SymbolTable *symtab) const;
 172 };
 173
 174 } // PowerISA namespace
 175
 176 #endif //__ARCH_POWER_INSTS_INTEGER_HH__