1 | /* cpu_asm.s |
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2 | * |
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3 | * This file contains all assembly code for the ARM implementation |
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4 | * of RTEMS. |
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5 | * |
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6 | * COPYRIGHT (c) 2000 Canon Research Centre France SA. |
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7 | * Emmanuel Raguet, mailto:raguet@crf.canon.fr |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.OARcorp.com/rtems/license.html. |
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12 | * |
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13 | */ |
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14 | |
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15 | #include <asm.h> |
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16 | |
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17 | /* |
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18 | * Format of ARM Register structure |
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19 | */ |
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20 | |
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21 | .set REG_R0, 0 |
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22 | .set REG_R1, 4 |
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23 | .set REG_R2, 8 |
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24 | .set REG_R3, 12 |
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25 | .set REG_R4, 16 |
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26 | .set REG_R5, 20 |
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27 | .set REG_R6, 24 |
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28 | .set REG_R7, 28 |
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29 | .set REG_R8, 32 |
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30 | .set REG_R9, 36 |
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31 | .set REG_R10, 40 |
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32 | .set REG_FP, 44 |
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33 | .set REG_IP, 48 |
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34 | .set REG_SP, 52 |
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35 | .set REG_LR, 56 |
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36 | .set REG_PC, 60 |
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37 | .set SIZE_REGS, REG_PC + 4 |
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38 | |
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39 | /* |
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40 | * void _CPU_Context_switch( run_context, heir_context ) |
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41 | * |
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42 | * This routine performs a normal non-FP context. |
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43 | * |
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44 | * R0 = run_context R1 = heir_context |
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45 | * |
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46 | */ |
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47 | |
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48 | .globl _CPU_Context_switch |
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49 | |
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50 | _CPU_Context_switch: |
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51 | str r2, [r0, #REG_R2] |
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52 | str r3, [r0, #REG_R3] |
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53 | str r4, [r0, #REG_R4] |
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54 | str r5, [r0, #REG_R5] |
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55 | str r6, [r0, #REG_R6] |
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56 | str r7, [r0, #REG_R7] |
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57 | str r8, [r0, #REG_R8] |
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58 | str r9, [r0, #REG_R9] |
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59 | str r10, [r0, #REG_R10] |
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60 | str sp, [r0, #REG_SP] |
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61 | str lr, [r0, #REG_PC] |
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62 | |
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63 | ldr r2, [r1, #REG_R2] |
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64 | ldr r3, [r1, #REG_R3] |
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65 | ldr r4, [r1, #REG_R4] |
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66 | ldr r5, [r1, #REG_R5] |
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67 | ldr r6, [r1, #REG_R6] |
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68 | ldr r7, [r1, #REG_R7] |
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69 | ldr r8, [r1, #REG_R8] |
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70 | ldr r9, [r1, #REG_R9] |
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71 | ldr r10, [r1, #REG_R10] |
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72 | ldr sp, [r1, #REG_SP] |
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73 | ldr lr, [r1, #REG_PC] |
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74 | mov pc, lr |
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75 | |
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76 | /* |
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77 | * NOTE: May be unnecessary to reload some registers. |
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78 | */ |
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79 | |
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80 | /* |
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81 | * void _CPU_Context_restore( new_context ) |
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82 | * |
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83 | * This routine performs a normal non-FP context. |
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84 | */ |
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85 | .globl _CPU_Context_restore |
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86 | |
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87 | _CPU_Context_restore: |
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88 | |
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89 | ldr r2, [r0, #REG_R2] |
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90 | ldr r3, [r0, #REG_R3] |
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91 | ldr r4, [r0, #REG_R4] |
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92 | ldr r5, [r0, #REG_R5] |
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93 | ldr r6, [r0, #REG_R6] |
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94 | ldr r7, [r0, #REG_R7] |
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95 | ldr r8, [r0, #REG_R8] |
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96 | ldr r9, [r0, #REG_R9] |
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97 | ldr r10, [r0, #REG_R10] |
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98 | ldr sp, [r0, #REG_SP] |
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99 | ldr lr, [r0, #REG_PC] |
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100 | mov pc, lr |
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101 | |
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102 | |
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103 | .globl _Exception_Handler_Undef_Swi |
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104 | _Exception_Handler_Undef_Swi: |
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105 | sub r13,r13,#SIZE_REGS |
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106 | str r0, [r13, #REG_R0] |
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107 | str r1, [r13, #REG_R1] |
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108 | str r2, [r13, #REG_R2] |
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109 | str r3, [r13, #REG_R3] |
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110 | str r4, [r13, #REG_R4] |
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111 | str r5, [r13, #REG_R5] |
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112 | str r6, [r13, #REG_R6] |
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113 | str r7, [r13, #REG_R7] |
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114 | str r8, [r13, #REG_R8] |
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115 | str r9, [r13, #REG_R9] |
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116 | str r10, [r13, #REG_R10] |
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117 | str fp, [r13, #REG_FP] |
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118 | str ip, [r13, #REG_IP] |
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119 | str sp, [r13, #REG_SP] |
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120 | str lr, [r13, #REG_LR] |
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121 | mrs r0, cpsr /* read the status */ |
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122 | and r0, r0,#0x1f /* we keep the mode as exception number */ |
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123 | str r0, [r13, #REG_PC] /* we store it in a free place */ |
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124 | mov r0, r13 /* put frame address in r0 (C arg 1) */ |
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125 | |
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126 | ldr r1, =_currentExcHandler |
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127 | ldr lr, =_go_back_1 |
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128 | ldr pc,[r1] /* call handler */ |
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129 | _go_back_1: |
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130 | ldr r0, [r13, #REG_R0] |
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131 | ldr r1, [r13, #REG_R1] |
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132 | ldr r2, [r13, #REG_R2] |
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133 | ldr r3, [r13, #REG_R3] |
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134 | ldr r4, [r13, #REG_R4] |
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135 | ldr r5, [r13, #REG_R5] |
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136 | ldr r6, [r13, #REG_R6] |
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137 | ldr r7, [r13, #REG_R7] |
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138 | ldr r8, [r13, #REG_R8] |
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139 | ldr r9, [r13, #REG_R9] |
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140 | ldr r10, [r13, #REG_R10] |
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141 | ldr fp, [r13, #REG_FP] |
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142 | ldr ip, [r13, #REG_IP] |
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143 | ldr sp, [r13, #REG_SP] |
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144 | ldr lr, [r13, #REG_LR] |
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145 | add r13,r13,#SIZE_REGS |
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146 | movs pc,r14 /* return */ |
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147 | |
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148 | .globl _Exception_Handler_Abort |
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149 | _Exception_Handler_Abort: |
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150 | sub r13,r13,#SIZE_REGS |
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151 | str r0, [r13, #REG_R0] |
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152 | str r1, [r13, #REG_R1] |
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153 | str r2, [r13, #REG_R2] |
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154 | str r3, [r13, #REG_R3] |
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155 | str r4, [r13, #REG_R4] |
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156 | str r5, [r13, #REG_R5] |
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157 | str r6, [r13, #REG_R6] |
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158 | str r7, [r13, #REG_R7] |
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159 | str r8, [r13, #REG_R8] |
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160 | str r9, [r13, #REG_R9] |
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161 | str r10, [r13, #REG_R10] |
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162 | str sp, [r13, #REG_FP] |
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163 | str lr, [r13, #REG_IP] |
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164 | str lr, [r13, #REG_SP] |
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165 | str lr, [r13, #REG_LR] |
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166 | mrs r0, cpsr /* read the status */ |
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167 | and r0, r0,#0x1f /* we keep the mode as exception number */ |
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168 | str r0, [r13, #REG_PC] /* we store it in a free place */ |
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169 | mov r0, r13 /* put frame address in ro (C arg 1) */ |
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170 | |
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171 | ldr r1, =_currentExcHandler |
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172 | ldr lr, =_go_back_2 |
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173 | ldr pc,[r1] /* call handler */ |
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174 | _go_back_2: |
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175 | ldr r0, [r13, #REG_R0] |
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176 | ldr r1, [r13, #REG_R1] |
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177 | ldr r2, [r13, #REG_R2] |
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178 | ldr r3, [r13, #REG_R3] |
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179 | ldr r4, [r13, #REG_R4] |
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180 | ldr r5, [r13, #REG_R5] |
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181 | ldr r6, [r13, #REG_R6] |
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182 | ldr r7, [r13, #REG_R7] |
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183 | ldr r8, [r13, #REG_R8] |
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184 | ldr r9, [r13, #REG_R9] |
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185 | ldr r10, [r13, #REG_R10] |
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186 | ldr sp, [r13, #REG_FP] |
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187 | ldr lr, [r13, #REG_IP] |
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188 | ldr lr, [r13, #REG_SP] |
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189 | ldr lr, [r13, #REG_LR] |
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190 | add r13,r13,#SIZE_REGS |
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191 | subs pc,r14,#4 /* return */ |
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192 | |
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193 | |
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