1 | /* |
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2 | * $Id$ |
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3 | * |
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4 | * This file contains all assembly code for the |
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5 | * LM32 implementation of RTEMS. |
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6 | * |
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7 | * Derived from no_cpu/cpu_asm.S, copyright (c) 1989-1999, |
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8 | * On-Line Applications Research Corporation (OAR). |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.com/license/LICENSE. |
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13 | * |
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14 | * Jukka Pietarinen <jukka.pietarinen@mrf.fi>, 2008, |
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15 | * Micro-Research Finland Oy |
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16 | */ |
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17 | |
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18 | #include <rtems/asm.h> |
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19 | #include <rtems/score/cpu_asm.h> |
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20 | |
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21 | #define MICO32_FULL_CONTEXT_SAVE_RESTORE |
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22 | |
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23 | /* void _CPU_Context_switch(run_context, heir_context) |
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24 | * |
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25 | * This routine performs a normal non-FP context switch. |
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26 | * |
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27 | * LM32 Specific Information: |
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28 | * |
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29 | * XXX document implementation including references if appropriate |
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30 | */ |
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31 | .globl _CPU_Context_switch |
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32 | _CPU_Context_switch: |
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33 | sw (r1+0), r9 |
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34 | sw (r1+4), r10 |
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35 | sw (r1+8), r11 |
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36 | sw (r1+12), r12 |
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37 | sw (r1+16), r13 |
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38 | sw (r1+20), r14 |
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39 | sw (r1+24), r15 |
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40 | sw (r1+28), r16 |
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41 | sw (r1+32), r17 |
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42 | sw (r1+36), r18 |
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43 | sw (r1+40), r19 |
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44 | sw (r1+44), r20 |
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45 | sw (r1+48), r21 |
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46 | sw (r1+52), r22 |
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47 | sw (r1+56), r23 |
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48 | sw (r1+60), r24 |
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49 | sw (r1+64), r25 |
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50 | sw (r1+68), gp |
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51 | sw (r1+72), fp |
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52 | sw (r1+76), sp |
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53 | sw (r1+80), ra |
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54 | |
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55 | /* |
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56 | * _CPU_Context_restore |
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57 | * |
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58 | * This routine is generally used only to restart self in an |
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59 | * efficient manner. It may simply be a label in _CPU_Context_switch. |
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60 | * |
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61 | * NOTE: May be unnecessary to reload some registers. |
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62 | * |
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63 | * LM32 Specific Information: |
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64 | * |
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65 | * XXX document implementation including references if appropriate |
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66 | */ |
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67 | .globl _CPU_Context_restore |
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68 | _CPU_Context_restore: |
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69 | lw r9, (r2+0) |
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70 | lw r10, (r2+4) |
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71 | lw r11, (r2+8) |
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72 | lw r12, (r2+12) |
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73 | lw r13, (r2+16) |
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74 | lw r14, (r2+20) |
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75 | lw r15, (r2+24) |
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76 | lw r16, (r2+28) |
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77 | lw r17, (r2+32) |
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78 | lw r18, (r2+36) |
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79 | lw r19, (r2+40) |
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80 | lw r20, (r2+44) |
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81 | lw r21, (r2+48) |
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82 | lw r22, (r2+52) |
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83 | lw r23, (r2+56) |
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84 | lw r24, (r2+60) |
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85 | lw r25, (r2+64) |
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86 | lw gp, (r2+68) |
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87 | lw fp, (r2+72) |
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88 | lw ra, (r2+80) |
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89 | /* Stack pointer must be restored last, in case it has been updated */ |
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90 | lw sp, (r2+76) |
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91 | nop |
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92 | ret |
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93 | |
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94 | /* void __ISR_Handler() |
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95 | * |
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96 | * This routine provides the RTEMS interrupt management. |
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97 | * |
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98 | * LM32 Specific Information: |
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99 | * |
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100 | * XXX document implementation including references if appropriate |
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101 | */ |
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102 | |
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103 | .globl _ISR_Handler |
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104 | _ISR_Handler: |
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105 | addi sp, sp, -128 |
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106 | sw (sp+4), r1 |
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107 | sw (sp+8), r2 |
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108 | sw (sp+12), r3 |
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109 | sw (sp+16), r4 |
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110 | sw (sp+20), r5 |
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111 | sw (sp+24), r6 |
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112 | sw (sp+28), r7 |
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113 | sw (sp+32), r8 |
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114 | sw (sp+36), r9 |
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115 | sw (sp+40), r10 |
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116 | #ifdef MICO32_FULL_CONTEXT_SAVE_RESTORE |
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117 | sw (sp+44), r11 |
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118 | sw (sp+48), r12 |
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119 | sw (sp+52), r13 |
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120 | sw (sp+56), r14 |
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121 | sw (sp+60), r15 |
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122 | sw (sp+64), r16 |
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123 | sw (sp+68), r17 |
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124 | sw (sp+72), r18 |
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125 | sw (sp+76), r19 |
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126 | sw (sp+80), r20 |
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127 | sw (sp+84), r21 |
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128 | sw (sp+88), r22 |
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129 | sw (sp+92), r23 |
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130 | sw (sp+96), r24 |
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131 | sw (sp+100), r25 |
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132 | sw (sp+104), r26 |
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133 | sw (sp+108), r27 |
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134 | #endif |
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135 | sw (sp+116), ra |
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136 | sw (sp+120), ea |
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137 | sw (sp+124), ba |
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138 | |
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139 | /* Scan through (IP & IM) bits starting from LSB until irq found */ |
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140 | rcsr r2,IP |
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141 | rcsr r3,IM |
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142 | and r4,r2,r3 |
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143 | or r1,r0,r0 |
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144 | ori r5,r0,1 |
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145 | find_irq: |
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146 | and r6,r4,r5 |
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147 | bne r6,r0,found_irq |
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148 | sli r5,r5,1 |
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149 | addi r1,r1,1 |
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150 | bne r5,r0,find_irq |
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151 | /* If we end up here there was no interrupt - this should never |
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152 | happen! */ |
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153 | bi exit_isr |
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154 | |
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155 | found_irq: |
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156 | .extern _ISR_Vector_table |
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157 | sli r1,r1,2 |
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158 | mvhi r7,hi(_ISR_Vector_table) |
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159 | ori r7,r7,lo(_ISR_Vector_table) |
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160 | lw r6,(r7+0) |
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161 | add r6,r6,r1 |
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162 | lw r5,(r6+0) |
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163 | call r5 |
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164 | |
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165 | exit_isr: |
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166 | lw r1, (sp+4) |
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167 | lw r2, (sp+8) |
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168 | lw r3, (sp+12) |
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169 | lw r4, (sp+16) |
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170 | lw r5, (sp+20) |
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171 | lw r6, (sp+24) |
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172 | lw r7, (sp+28) |
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173 | lw r8, (sp+32) |
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174 | lw r9, (sp+36) |
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175 | lw r10, (sp+40) |
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176 | #ifdef MICO32_FULL_CONTEXT_SAVE_RESTORE |
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177 | lw r11, (sp+44) |
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178 | lw r12, (sp+48) |
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179 | lw r13, (sp+52) |
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180 | lw r14, (sp+56) |
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181 | lw r15, (sp+60) |
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182 | lw r16, (sp+64) |
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183 | lw r17, (sp+68) |
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184 | lw r18, (sp+72) |
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185 | lw r19, (sp+76) |
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186 | lw r20, (sp+80) |
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187 | lw r21, (sp+84) |
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188 | lw r22, (sp+88) |
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189 | lw r23, (sp+92) |
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190 | lw r24, (sp+96) |
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191 | lw r25, (sp+100) |
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192 | lw r26, (sp+104) |
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193 | lw r27, (sp+108) |
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194 | #endif |
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195 | lw ra, (sp+116) |
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196 | lw ea, (sp+120) |
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197 | lw ba, (sp+124) |
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198 | addi sp, sp, 128 |
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199 | nop |
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200 | eret |
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201 | |
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