1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup ScoreCPU |
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5 | * |
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6 | * @brief ARM data and prefetch abort exception prologue and epilogue. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2009 |
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11 | * embedded brains GmbH |
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12 | * Obere Lagerstr. 30 |
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13 | * D-82178 Puchheim |
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14 | * Germany |
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15 | * <rtems@embedded-brains.de> |
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16 | * |
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17 | * The license and distribution terms for this file may be |
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18 | * found in the file LICENSE in this distribution or at |
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19 | * http://www.rtems.org/license/LICENSE. |
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20 | */ |
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21 | |
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22 | #ifdef HAVE_CONFIG_H |
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23 | #include "config.h" |
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24 | #endif |
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25 | |
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26 | #include <rtems/asm.h> |
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27 | #include <rtems/system.h> |
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28 | |
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29 | #ifdef ARM_MULTILIB_ARCH_V4 |
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30 | |
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31 | .extern _ARM_Exception_default |
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32 | |
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33 | .globl _ARMV4_Exception_data_abort_set_handler |
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34 | .globl _ARMV4_Exception_data_abort |
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35 | |
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36 | .globl _ARMV4_Exception_prefetch_abort_set_handler |
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37 | .globl _ARMV4_Exception_prefetch_abort |
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38 | |
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39 | .section ".bss" |
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40 | |
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41 | data_abort_handler: |
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42 | .long 0 |
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43 | |
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44 | prefetch_abort_handler: |
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45 | .long 0 |
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46 | |
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47 | .section ".text" |
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48 | |
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49 | #ifdef __thumb__ |
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50 | .thumb_func |
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51 | #endif |
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52 | |
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53 | _ARMV4_Exception_data_abort_set_handler: |
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54 | ldr r1, =data_abort_handler |
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55 | str r0, [r1] |
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56 | #ifdef __thumb__ |
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57 | bx lr |
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58 | #else |
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59 | mov pc, lr |
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60 | #endif |
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61 | |
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62 | #ifdef __thumb__ |
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63 | .thumb_func |
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64 | #endif |
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65 | |
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66 | _ARMV4_Exception_prefetch_abort_set_handler: |
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67 | ldr r1, =prefetch_abort_handler |
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68 | str r0, [r1] |
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69 | #ifdef __thumb__ |
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70 | bx lr |
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71 | #else |
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72 | mov pc, lr |
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73 | #endif |
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74 | |
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75 | .arm |
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76 | |
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77 | _ARMV4_Exception_prefetch_abort: |
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78 | |
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79 | /* Save context and load handler */ |
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80 | sub sp, #20 |
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81 | stmdb sp!, {r0-r12} |
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82 | mov r4, #3 |
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83 | ldr r6, =prefetch_abort_handler |
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84 | |
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85 | b save_more_context |
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86 | |
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87 | _ARMV4_Exception_data_abort: |
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88 | |
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89 | /* Save context and load handler */ |
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90 | sub sp, #20 |
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91 | stmdb sp!, {r0-r12} |
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92 | mov r4, #4 |
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93 | ldr r6, =data_abort_handler |
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94 | |
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95 | save_more_context: |
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96 | |
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97 | /* Save more context */ |
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98 | mov r2, lr |
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99 | mrs r3, spsr |
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100 | mrs r7, cpsr |
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101 | orr r5, r3, #ARM_PSR_I |
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102 | bic r5, #ARM_PSR_T |
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103 | msr cpsr, r5 |
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104 | mov r0, sp |
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105 | mov r1, lr |
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106 | msr cpsr, r7 |
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107 | add r5, sp, #72 |
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108 | stmdb r5!, {r0-r4} |
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109 | |
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110 | /* Call high level handler */ |
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111 | ldr r2, [r6] |
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112 | cmp r2, #0 |
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113 | ldreq r2, =_ARM_Exception_default |
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114 | mov r0, sp |
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115 | #ifndef __thumb__ |
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116 | mov lr, pc |
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117 | mov pc, r2 |
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118 | #else /* __thumb__ */ |
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119 | SWITCH_FROM_ARM_TO_THUMB r1 |
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120 | bl call_handler |
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121 | SWITCH_FROM_THUMB_TO_ARM |
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122 | #endif /* __thumb__ */ |
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123 | |
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124 | /* Restore context */ |
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125 | ldmia r5!, {r0-r4} |
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126 | mov lr, r2 |
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127 | msr spsr, r3 |
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128 | ldmia sp!, {r0-r12} |
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129 | add sp, #20 |
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130 | |
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131 | /* Return from interrupt */ |
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132 | subs pc, lr, #8 |
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133 | |
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134 | #ifdef __thumb__ |
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135 | .thumb |
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136 | call_handler: |
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137 | bx r2 |
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138 | #endif /* __thumb__ */ |
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139 | |
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140 | #endif /* ARM_MULTILIB_ARCH_V4 */ |
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