src/arch/arm/registers.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) 2007-2008 The Florida State University
  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: Stephen Hines
  41  */
  42
  43 #ifndef __ARCH_ARM_REGISTERS_HH__
  44 #define __ARCH_ARM_REGISTERS_HH__
  45
  46 #include "arch/arm/intregs.hh"
  47 #include "arch/arm/max_inst_regs.hh"
  48 #include "arch/arm/miscregs.hh"
  49
  50 namespace ArmISA {
  51
  52
  53 // For a predicated instruction, we need all the
  54 // destination registers to also be sources
  55 const int MaxInstSrcRegs = ArmISAInst::MaxInstDestRegs +
  56     ArmISAInst::MaxInstSrcRegs;
  57 using ArmISAInst::MaxInstDestRegs;
  58
  59 typedef uint16_t  RegIndex;
  60
  61 typedef uint64_t IntReg;
  62
  63 // floating point register file entry type
  64 typedef uint32_t FloatRegBits;
  65 typedef float FloatReg;
  66
  67 // cop-0/cop-1 system control register
  68 typedef uint64_t MiscReg;
  69
  70 // Constants Related to the number of registers
  71 const int NumIntArchRegs = NUM_ARCH_INTREGS;
  72 // The number of single precision floating point registers
  73 const int NumFloatArchRegs = 64;
  74 const int NumFloatSpecialRegs = 8;
  75
  76 const int NumIntRegs = NUM_INTREGS;
  77 const int NumFloatRegs = NumFloatArchRegs + NumFloatSpecialRegs;
  78 const int NumMiscRegs = NUM_MISCREGS;
  79
  80 const int TotalNumRegs = NumIntRegs + NumFloatRegs + NumMiscRegs;
  81
  82 // semantically meaningful register indices
  83 const int ReturnValueReg = 0;
  84 const int ReturnValueReg1 = 1;
  85 const int ReturnValueReg2 = 2;
  86 const int NumArgumentRegs = 4;
  87 const int ArgumentReg0 = 0;
  88 const int ArgumentReg1 = 1;
  89 const int ArgumentReg2 = 2;
  90 const int ArgumentReg3 = 3;
  91 const int FramePointerReg = 11;
  92 const int StackPointerReg = INTREG_SP;
  93 const int ReturnAddressReg = INTREG_LR;
  94 const int PCReg = INTREG_PC;
  95
  96 const int ZeroReg = INTREG_ZERO;
  97
  98 const int SyscallNumReg = ReturnValueReg;
  99 const int SyscallPseudoReturnReg = ReturnValueReg;
 100 const int SyscallSuccessReg = ReturnValueReg;
 101
 102 // These help enumerate all the registers for dependence tracking.
 103 const int FP_Base_DepTag = NumIntRegs * (MODE_MAXMODE + 1);
 104 const int Ctrl_Base_DepTag = FP_Base_DepTag + NumFloatRegs;
 105 const int Max_DepTag = Ctrl_Base_DepTag + NumMiscRegs;
 106
 107 typedef union {
 108     IntReg   intreg;
 109     FloatReg fpreg;
 110     MiscReg  ctrlreg;
 111 } AnyReg;
 112
 113 } // namespace ArmISA
 114
 115 #endif