[384] | 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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