1 | /*
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2 | * TOPPERS Software
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3 | * Toyohashi Open Platform for Embedded Real-Time Systems
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4 | *
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5 | * Copyright (C) 2000-2003 by Embedded and Real-Time Systems Laboratory
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6 | * Toyohashi Univ. of Technology, JAPAN
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7 | * Copyright (C) 2006-2016 by Embedded and Real-Time Systems Laboratory
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8 | * Graduate School of Information Science, Nagoya Univ., JAPAN
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9 | * Copyright (C) 2018, 2019 by Naoki Saito
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10 | * Nagoya Municipal Industrial Research Institute, JAPAN
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11 | *
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12 | * ä¸è¨èä½æ¨©è
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13 | ã¯ï¼ä»¥ä¸ã®(1)ã(4)ã®æ¡ä»¶ãæºããå ´åã«éãï¼æ¬ã½ããã¦ã§
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14 | * ã¢ï¼æ¬ã½ããã¦ã§ã¢ãæ¹å¤ãããã®ãå«ãï¼ä»¥ä¸åãï¼ã使ç¨ã»è¤è£½ã»æ¹
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15 | * å¤ã»åé
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16 | å¸ï¼ä»¥ä¸ï¼å©ç¨ã¨å¼ã¶ï¼ãããã¨ãç¡åã§è¨±è«¾ããï¼
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17 | * (1) æ¬ã½ããã¦ã§ã¢ãã½ã¼ã¹ã³ã¼ãã®å½¢ã§å©ç¨ããå ´åã«ã¯ï¼ä¸è¨ã®èä½
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18 | * 権表示ï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãï¼ãã®ã¾ã¾ã®å½¢ã§ã½ã¼
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19 | * ã¹ã³ã¼ãä¸ã«å«ã¾ãã¦ãããã¨ï¼
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20 | * (2) æ¬ã½ããã¦ã§ã¢ãï¼ã©ã¤ãã©ãªå½¢å¼ãªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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21 | * ç¨ã§ããå½¢ã§åé
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22 | å¸ããå ´åã«ã¯ï¼åé
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23 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨
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24 | * è
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25 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®èä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨
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26 | * ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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27 | * (3) æ¬ã½ããã¦ã§ã¢ãï¼æ©å¨ã«çµã¿è¾¼ããªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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28 | * ç¨ã§ããªãå½¢ã§åé
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29 | å¸ããå ´åã«ã¯ï¼æ¬¡ã®ããããã®æ¡ä»¶ãæºããã
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30 | * ã¨ï¼
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31 | * (a) åé
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32 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨è
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33 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®è
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34 | * ä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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35 | * (b) åé
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36 | å¸ã®å½¢æ
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37 | ãï¼å¥ã«å®ããæ¹æ³ã«ãã£ã¦ï¼TOPPERSããã¸ã§ã¯ãã«
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38 | * å ±åãããã¨ï¼
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39 | * (4) æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´æ¥çã¾ãã¯éæ¥çã«çãããããªãæ
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40 | * 害ãããï¼ä¸è¨èä½æ¨©è
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41 | ããã³TOPPERSããã¸ã§ã¯ããå
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42 | 責ãããã¨ï¼
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43 | * ã¾ãï¼æ¬ã½ããã¦ã§ã¢ã®ã¦ã¼ã¶ã¾ãã¯ã¨ã³ãã¦ã¼ã¶ããã®ãããªãç
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44 | * ç±ã«åºã¥ãè«æ±ãããï¼ä¸è¨èä½æ¨©è
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45 | ããã³TOPPERSããã¸ã§ã¯ãã
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46 | * å
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47 | 責ãããã¨ï¼
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48 | *
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49 | * æ¬ã½ããã¦ã§ã¢ã¯ï¼ç¡ä¿è¨¼ã§æä¾ããã¦ãããã®ã§ããï¼ä¸è¨èä½æ¨©è
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50 | ã
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51 | * ãã³TOPPERSããã¸ã§ã¯ãã¯ï¼æ¬ã½ããã¦ã§ã¢ã«é¢ãã¦ï¼ç¹å®ã®ä½¿ç¨ç®ç
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52 | * ã«å¯¾ããé©åæ§ãå«ãã¦ï¼ãããªãä¿è¨¼ãè¡ããªãï¼ã¾ãï¼æ¬ã½ããã¦ã§
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53 | * ã¢ã®å©ç¨ã«ããç´æ¥çã¾ãã¯éæ¥çã«çãããããªãæ害ã«é¢ãã¦ãï¼ã
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54 | * ã®è²¬ä»»ãè² ããªãï¼
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55 | *
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56 | * $Id: start.S 384 2019-04-16 11:01:09Z nmir-saito $
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57 | */
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58 |
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59 | #define TOPPERS_MACRO_ONLY
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60 | #define UINT64_C(val) (val) /* uint64_tåã®å®æ°ãä½ããã¯ã */
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61 | #include "kernel_impl.h"
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62 |
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63 | .text
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64 | .align 4
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65 | .global start
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66 | .global vectors
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67 | start:
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68 | // ã³ã¢0ã®ã¿å©ç¨
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69 | mrs x0, mpidr_el1
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70 | and x0, x0, #3
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71 | cbz x0, 2f
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72 | 1:
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73 | // ã³ã¢0以å¤
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74 | wfi
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75 | b 1b
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76 | 2:
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77 | // ãã以éã¯ã³ã¢0ã®ã¿
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78 | msr daifset, #(AARCH64_DAIF_IRQ | AARCH64_DAIF_FIQ) // CPSR.{I,F}=1
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79 |
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80 | /*
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81 | * ã¹ã¿ãã¯å
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82 | é çªå°ãåãåºãã¦ãã
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83 | */
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84 | adrp x1, _kernel_istkpt
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85 | add x1, x1, :lo12:_kernel_istkpt
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86 | ldr x1, [x1]
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87 |
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88 | /*
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89 | * ELæ¯ã®å¦ç
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90 | */
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91 | mrs x0, CurrentEL
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92 | and x0, x0, #(0x3 << 2)
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93 | cmp x0, #(0x3 << 2) // EL3?
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94 | bne start_el2
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95 |
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96 | /*
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97 | * EL3
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98 | */
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99 | start_el3:
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100 | mov x2, #0x5b1 // RW=1(EL2 is AArch64), HCE=1, SMD=1, NS=1(non-secure)
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101 | msr scr_el3, x2
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102 | isb
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103 |
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104 | /* Set up CNTFRQ_EL0 */
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105 | ldr x0, =19200000 // 19.2MHz
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106 | msr CNTFRQ_EL0, x0
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107 |
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108 | // EL2ã¸ç§»è¡
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109 | mov x2, #0x0c9 // I=F=1, MODE=1001 (EL2h)
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110 | msr spsr_el3, x2
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111 | adr x2, start_el2
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112 | msr elr_el3, x2
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113 | eret
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114 |
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115 | /*
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116 | * EL2
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117 | */
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118 | start_el2:
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119 | cmp x0, #(0x1 << 2) // EL2?
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120 | beq start_el1
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121 |
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122 | msr sp_el1, x1
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123 |
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124 | mov x0, #(1 << 31) // RW=1(EL1 is AArch64)
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125 | orr x0, x0, #(1 << 1) // SWIO hardwired on Pi3
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126 | msr hcr_el2, x0 // TSC=0(SMC is not trapped)
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127 | isb
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128 |
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129 | mrs x0, cnthctl_el2 // EL1PCTEN=1, EL1PCEN=1
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130 | orr x0, x0, #3
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131 | msr cnthctl_el2, x0
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132 | msr cntvoff_el2, xzr
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133 | isb
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134 |
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135 | // EL1ã¸ç§»è¡
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136 | mov x2, #0x0c5 // I,F=1, mode=0101(EL1h)
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137 | msr spsr_el2, x2
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138 | adr x2, start_el1
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139 | msr elr_el2, x2
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140 | eret
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141 |
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142 | /*
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143 | * EL1h
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144 | */
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145 | start_el1:
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146 | // ã¹ã¿ãã¯ãã¤ã³ã¿ã¨ãã¬ã¼ã ãã¤ã³ã¿ã®åæå
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147 | mov sp, x1
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148 | mov x29, xzr
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149 |
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150 | /*
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151 | * ä¾å¤ãã¯ã¿ãã¼ãã«ã®ãã¼ã¹ã¢ãã¬ã¹è¨å®
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152 | */
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153 | ldr x0, =vectors
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154 | msr vbar_el1, x0
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155 |
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156 | /*
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157 | * bssã»ã¯ã·ã§ã³ã®ã¯ãªã¢
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158 | */
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159 | ldr x1, =__start_bss
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160 | ldr x2, =__end_bss
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161 | cmp x1, x2
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162 | b.hs 4f
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163 | 3:
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164 | str xzr, [x1], #8
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165 | cmp x1, x2
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166 | b.lo 3b
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167 |
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168 | 4:
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169 | /*
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170 | * sta_kerå¼ã³åºã
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171 | */
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172 | bl sta_ker
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173 | b .
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