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1 /* |
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2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 using System; |
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18 using System.Collections.Generic; |
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19 using System.Text; |
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20 using SymbianUtils.BasicTypes; |
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21 using SymbianStructuresLib.Arm.Registers; |
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22 using SymbianStructuresLib.Arm.Instructions; |
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23 using SymbianInstructionLib.Arm.Instructions.Common; |
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24 |
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25 namespace SymbianInstructionLib.Arm.Instructions.Arm.DataTransfer |
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26 { |
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27 [ArmRefAttribute( "A4.1.20 LDM(1) + A5.4.1 Encoding", "LDM{<cond>}<addressing_mode> <Rn>{!}, <registers>" )] |
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28 public class Arm_LDM : Arm_LoadOrStoreMultiple_GP |
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29 { |
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30 #region Enumerations |
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31 public enum TType |
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32 { |
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33 ETypeNotSupported = -1, |
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34 ETypeNonEmptyGP = 0, |
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35 ETypeUserModeWhenInPrivilaged, |
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36 ETypeGPAndPCAndUpdateCPSR |
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37 } |
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38 #endregion |
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39 |
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40 #region Constructors |
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41 public Arm_LDM() |
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42 { |
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43 // 4 3 4 16 bits |
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44 // --------------------------------------------------- |
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45 // cond 100 P U S W L Rn register list |
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46 // 1110 100 0 1 0 1 1 1101 1000111111110000 |
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47 // |
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48 // P = indicates that the word addressed by Rn is included in the range of memory |
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49 // locations accessed, lying at the top (U==0) or bottom (U==1) of that range. |
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50 // |
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51 // U = Indicates that the transfer is made upwards (U==1) or downwards (U==0) from |
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52 // the base register. |
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53 // |
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54 // S = For LDMs that load the PC, the S bit indicates that the CPSR is loaded |
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55 // from the SPSR. |
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56 // |
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57 // W = Indicates that the base register is updated after the transfer. The base |
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58 // register is incremented (U==1) or decremented (U==0) by four times the |
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59 // number of registers in the register list. |
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60 // |
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61 // L = Distinguishes between Load (L==1) and Store (L==0) instructions. |
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62 // |
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63 // Rn = Specifies the base register used by <addressing_mode>. Using R15 as |
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64 // the base register <Rn> gives an UNPREDICTABLE result. |
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65 // |
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66 // This mask translates to "LDM's that load PC from SP" |
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67 // 1110 100 01011 1101 1000111111110000 |
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68 base.SetMask( "####" + "100" + "##" + "##1" + "####" + "######## ########" ); |
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69 } |
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70 #endregion |
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71 |
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72 #region From ArmInstruction |
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73 public override bool Matches( uint aOpCode ) |
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74 { |
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75 bool match = base.Matches( aOpCode ); |
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76 if ( match ) |
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77 { |
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78 TType type = StaticInternalType( aOpCode ); |
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79 match = ( type != TType.ETypeNotSupported ); |
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80 } |
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81 return match; |
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82 } |
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83 #endregion |
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84 |
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85 #region From Arm_LoadOrStore |
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86 public override TArmDataTransferType DataTransferType |
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87 { |
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88 get { return TArmDataTransferType.ELoad; } |
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89 } |
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90 #endregion |
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91 |
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92 #region Properties |
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93 public TType Type |
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94 { |
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95 get { return iType; } |
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96 } |
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97 #endregion |
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98 |
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99 #region From ArmBaseInstruction |
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100 protected override void OnRawValueAssigned() |
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101 { |
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102 base.OnRawValueAssigned(); |
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103 iType = InternalType; |
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104 } |
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105 #endregion |
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106 |
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107 #region Internal methods |
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108 private new SymBit SBit // Hide |
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109 { |
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110 get { return SymBit.EClear; } |
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111 } |
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112 |
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113 private TType InternalType |
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114 { |
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115 get |
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116 { |
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117 uint raw = base.AIRawValue; |
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118 TType ret = StaticInternalType( raw ); |
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119 return ret; |
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120 } |
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121 } |
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122 |
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123 private static TType StaticInternalType( uint aRaw ) |
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124 { |
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125 TType ret = TType.ETypeNotSupported; |
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126 // |
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127 if ( KLDM1.IsMatch( aRaw ) ) |
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128 { |
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129 ret = TType.ETypeNonEmptyGP; |
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130 } |
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131 else if ( KLDM2.IsMatch( aRaw ) ) |
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132 { |
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133 ret = TType.ETypeUserModeWhenInPrivilaged; |
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134 } |
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135 else if ( KLDM3.IsMatch( aRaw ) ) |
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136 { |
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137 ret = TType.ETypeGPAndPCAndUpdateCPSR; |
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138 } |
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139 // |
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140 return ret; |
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141 } |
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142 #endregion |
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143 |
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144 #region Data members |
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145 private TType iType = TType.ETypeNotSupported; |
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146 private static readonly SymMask KLDM1 = new SymMask( "####" + "100" + "##" + "0#1" + "####" + "######## ########" ); |
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147 private static readonly SymMask KLDM2 = new SymMask( "####" + "100" + "##" + "101" + "####" + "0####### ########" ); |
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148 private static readonly SymMask KLDM3 = new SymMask( "####" + "100" + "##" + "1#1" + "####" + "1####### ########" ); |
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149 #endregion |
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150 } |
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151 } |
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152 |