1 | /* |
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2 | * Copyrigh (c) 2015 Hesham Almatary <hesham@alumni.york.ac.uk> |
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3 | * |
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4 | * Redistribution and use in source and binary forms, with or without |
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5 | * modification, are permitted provided that the following conditions |
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6 | * are met: |
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7 | * 1. Redistributions of source code must retain the above copyright |
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8 | * notice, this list of conditions and the following disclaimer. |
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9 | * 2. Redistributions in binary form must reproduce the above copyright |
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10 | * notice, this list of conditions and the following disclaimer in the |
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11 | * documentation and/or other materials provided with the distribution. |
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12 | * |
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13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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16 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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23 | * SUCH DAMAGE. |
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24 | */ |
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25 | |
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26 | #ifdef HAVE_CONFIG_H |
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27 | #include "config.h" |
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28 | #endif |
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29 | |
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30 | #include <rtems/asm.h> |
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31 | #include <rtems/score/cpu.h> |
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32 | |
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33 | .section .text |
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34 | |
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35 | |
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36 | PUBLIC(_CPU_Context_validate) |
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37 | SYM(_CPU_Context_validate): |
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38 | /* RISC-V/RTEMS context has 36 registers of CPU_SIZEOF_POINTER size */ |
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39 | addi sp, sp, -1 * 36 * CPU_SIZEOF_POINTER |
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40 | |
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41 | SREG x1, (1 * CPU_SIZEOF_POINTER)(sp) |
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42 | /* Skip x2/sp */ |
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43 | SREG x3, (3 * CPU_SIZEOF_POINTER)(sp) |
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44 | SREG x4, (4 * CPU_SIZEOF_POINTER)(sp) |
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45 | SREG x5, (5 * CPU_SIZEOF_POINTER)(sp) |
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46 | SREG x6, (6 * CPU_SIZEOF_POINTER)(sp) |
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47 | SREG x7, (7 * CPU_SIZEOF_POINTER)(sp) |
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48 | SREG x8, (8 * CPU_SIZEOF_POINTER)(sp) |
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49 | SREG x9, (9 * CPU_SIZEOF_POINTER)(sp) |
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50 | SREG x10, (10 * CPU_SIZEOF_POINTER)(sp) |
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51 | SREG x11, (11 * CPU_SIZEOF_POINTER)(sp) |
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52 | SREG x12, (12 * CPU_SIZEOF_POINTER)(sp) |
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53 | SREG x13, (13 * CPU_SIZEOF_POINTER)(sp) |
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54 | SREG x14, (14 * CPU_SIZEOF_POINTER)(sp) |
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55 | SREG x15, (15 * CPU_SIZEOF_POINTER)(sp) |
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56 | SREG x16, (16 * CPU_SIZEOF_POINTER)(sp) |
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57 | SREG x17, (17 * CPU_SIZEOF_POINTER)(sp) |
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58 | SREG x18, (18 * CPU_SIZEOF_POINTER)(sp) |
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59 | SREG x19, (19 * CPU_SIZEOF_POINTER)(sp) |
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60 | SREG x20, (20 * CPU_SIZEOF_POINTER)(sp) |
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61 | SREG x21, (21 * CPU_SIZEOF_POINTER)(sp) |
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62 | SREG x22, (22 * CPU_SIZEOF_POINTER)(sp) |
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63 | SREG x23, (23 * CPU_SIZEOF_POINTER)(sp) |
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64 | SREG x24, (24 * CPU_SIZEOF_POINTER)(sp) |
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65 | SREG x25, (25 * CPU_SIZEOF_POINTER)(sp) |
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66 | SREG x26, (26 * CPU_SIZEOF_POINTER)(sp) |
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67 | SREG x27, (27 * CPU_SIZEOF_POINTER)(sp) |
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68 | SREG x28, (28 * CPU_SIZEOF_POINTER)(sp) |
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69 | SREG x29, (28 * CPU_SIZEOF_POINTER)(sp) |
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70 | SREG x30, (30 * CPU_SIZEOF_POINTER)(sp) |
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71 | SREG x31, (31 * CPU_SIZEOF_POINTER)(sp) |
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72 | |
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73 | /* Fill */ |
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74 | |
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75 | /* t0 is used for temporary values */ |
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76 | mv t0, x0 |
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77 | |
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78 | /* x31 contains the stack pointer */ |
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79 | mv x31, sp |
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80 | |
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81 | .macro fill_register reg |
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82 | addi t0, t0, 1 |
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83 | mv \reg, t0 |
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84 | .endm |
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85 | |
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86 | fill_register x1 |
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87 | fill_register x2 |
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88 | fill_register x3 |
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89 | fill_register x4 |
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90 | fill_register x5 |
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91 | fill_register x6 |
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92 | fill_register x7 |
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93 | fill_register x8 |
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94 | fill_register x9 |
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95 | fill_register x10 |
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96 | fill_register x11 |
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97 | fill_register x12 |
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98 | fill_register x13 |
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99 | fill_register x14 |
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100 | fill_register x15 |
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101 | fill_register x16 |
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102 | fill_register x17 |
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103 | fill_register x18 |
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104 | fill_register x19 |
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105 | fill_register x20 |
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106 | fill_register x21 |
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107 | fill_register x22 |
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108 | fill_register x23 |
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109 | fill_register x24 |
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110 | fill_register x25 |
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111 | fill_register x26 |
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112 | fill_register x27 |
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113 | fill_register x28 |
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114 | fill_register x29 |
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115 | fill_register x30 |
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116 | fill_register x31 |
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117 | |
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118 | /* Check */ |
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119 | check: |
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120 | |
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121 | .macro check_register reg |
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122 | addi t0, t0, 1 |
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123 | bne \reg, t0, restore |
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124 | .endm |
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125 | |
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126 | bne x31, sp, restore |
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127 | |
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128 | mv t0, x0 |
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129 | |
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130 | check_register x1 |
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131 | check_register x2 |
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132 | check_register x3 |
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133 | check_register x4 |
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134 | check_register x5 |
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135 | check_register x6 |
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136 | check_register x7 |
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137 | check_register x8 |
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138 | check_register x9 |
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139 | check_register x10 |
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140 | check_register x11 |
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141 | check_register x12 |
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142 | check_register x13 |
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143 | check_register x14 |
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144 | check_register x15 |
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145 | check_register x16 |
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146 | check_register x17 |
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147 | check_register x18 |
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148 | check_register x19 |
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149 | check_register x20 |
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150 | check_register x21 |
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151 | check_register x22 |
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152 | check_register x23 |
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153 | check_register x24 |
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154 | check_register x25 |
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155 | check_register x26 |
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156 | check_register x27 |
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157 | check_register x28 |
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158 | check_register x29 |
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159 | check_register x30 |
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160 | check_register x31 |
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161 | |
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162 | j check |
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163 | |
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164 | /* Restore */ |
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165 | restore: |
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166 | LREG x1, (1 * CPU_SIZEOF_POINTER)(sp) |
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167 | /* Skip sp/x2 */ |
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168 | LREG x3, (3 * CPU_SIZEOF_POINTER)(sp) |
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169 | LREG x4, (4 * CPU_SIZEOF_POINTER)(sp) |
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170 | LREG x5, (5 * CPU_SIZEOF_POINTER)(sp) |
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171 | LREG x6, (6 * CPU_SIZEOF_POINTER)(sp) |
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172 | LREG x7, (7 * CPU_SIZEOF_POINTER)(sp) |
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173 | LREG x8, (8 * CPU_SIZEOF_POINTER)(sp) |
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174 | LREG x9, (9 * CPU_SIZEOF_POINTER)(sp) |
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175 | LREG x10, (10 * CPU_SIZEOF_POINTER)(sp) |
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176 | LREG x11, (11 * CPU_SIZEOF_POINTER)(sp) |
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177 | LREG x12, (12 * CPU_SIZEOF_POINTER)(sp) |
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178 | LREG x13, (13 * CPU_SIZEOF_POINTER)(sp) |
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179 | LREG x14, (14 * CPU_SIZEOF_POINTER)(sp) |
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180 | LREG x15, (15 * CPU_SIZEOF_POINTER)(sp) |
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181 | LREG x16, (16 * CPU_SIZEOF_POINTER)(sp) |
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182 | LREG x17, (17 * CPU_SIZEOF_POINTER)(sp) |
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183 | LREG x18, (18 * CPU_SIZEOF_POINTER)(sp) |
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184 | LREG x19, (19 * CPU_SIZEOF_POINTER)(sp) |
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185 | LREG x20, (20 * CPU_SIZEOF_POINTER)(sp) |
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186 | LREG x21, (21 * CPU_SIZEOF_POINTER)(sp) |
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187 | LREG x22, (22 * CPU_SIZEOF_POINTER)(sp) |
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188 | LREG x23, (23 * CPU_SIZEOF_POINTER)(sp) |
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189 | LREG x24, (24 * CPU_SIZEOF_POINTER)(sp) |
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190 | LREG x25, (25 * CPU_SIZEOF_POINTER)(sp) |
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191 | LREG x26, (26 * CPU_SIZEOF_POINTER)(sp) |
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192 | LREG x27, (27 * CPU_SIZEOF_POINTER)(sp) |
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193 | LREG x28, (28 * CPU_SIZEOF_POINTER)(sp) |
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194 | LREG x29, (29 * CPU_SIZEOF_POINTER)(sp) |
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195 | LREG x30, (30 * CPU_SIZEOF_POINTER)(sp) |
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196 | |
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197 | LREG x31, (31 * CPU_SIZEOF_POINTER)(sp) |
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198 | |
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199 | addi sp, sp, 36 * CPU_SIZEOF_POINTER |
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200 | ret |
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