1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup ppc_exc |
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5 | * |
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6 | * @brief PowerPC Exceptions implementation. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (C) 1999 Eric Valette (valette@crf.canon.fr) |
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11 | * Canon Centre Recherche France. |
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12 | * |
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13 | * Derived from file "libcpu/powerpc/new-exceptions/bspsupport/vectors_init.c". |
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14 | * |
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15 | * The license and distribution terms for this file may be |
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16 | * found in the file LICENSE in this distribution or at |
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17 | * http://www.rtems.com/license/LICENSE. |
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18 | * |
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19 | * $Id$ |
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20 | */ |
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21 | |
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22 | #include <bsp/vectors.h> |
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23 | |
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24 | exception_handler_t globalExceptHdl = C_exception_handler; |
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25 | |
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26 | /* T. Straumann: provide a stack trace |
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27 | * <strauman@slac.stanford.edu>, 6/26/2001 |
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28 | */ |
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29 | typedef struct LRFrameRec_ { |
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30 | struct LRFrameRec_ *frameLink; |
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31 | unsigned long *lr; |
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32 | } LRFrameRec, *LRFrame; |
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33 | |
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34 | #define STACK_CLAMP 50 /* in case we have a corrupted bottom */ |
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35 | |
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36 | static uint32_t ppc_exc_get_DAR_dflt(void) |
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37 | { |
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38 | if (ppc_cpu_is_60x()) |
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39 | return PPC_SPECIAL_PURPOSE_REGISTER(DAR); |
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40 | else |
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41 | switch (ppc_cpu_is_bookE()) { |
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42 | default: |
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43 | break; |
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44 | case PPC_BOOKE_STD: |
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45 | case PPC_BOOKE_E500: |
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46 | return PPC_SPECIAL_PURPOSE_REGISTER(DEAR_BOOKE); |
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47 | case PPC_BOOKE_405: |
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48 | return PPC_SPECIAL_PURPOSE_REGISTER(DEAR_405); |
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49 | } |
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50 | return 0xdeadbeef; |
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51 | } |
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52 | |
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53 | uint32_t (*ppc_exc_get_DAR)(void) = ppc_exc_get_DAR_dflt; |
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54 | |
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55 | void BSP_printStackTrace(BSP_Exception_frame *excPtr) |
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56 | { |
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57 | LRFrame f; |
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58 | int i; |
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59 | LRFrame sp; |
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60 | void *lr; |
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61 | |
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62 | printk("Stack Trace: \n "); |
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63 | if (excPtr) { |
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64 | printk("IP: 0x%08x, ", excPtr->EXC_SRR0); |
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65 | sp = (LRFrame) excPtr->GPR1; |
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66 | lr = (void *) excPtr->EXC_LR; |
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67 | } else { |
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68 | /* there's no macro for this */ |
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69 | __asm__ __volatile__("mr %0, 1":"=r"(sp)); |
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70 | lr = (LRFrame) ppc_link_register(); |
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71 | } |
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72 | printk("LR: 0x%08x\n", lr); |
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73 | for (f = (LRFrame) sp, i = 0; f->frameLink && i < STACK_CLAMP; f = f->frameLink) { |
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74 | printk("--^ 0x%08x", (long) (f->frameLink->lr)); |
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75 | if (!(++i % 5)) |
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76 | printk("\n"); |
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77 | } |
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78 | if (i >= STACK_CLAMP) { |
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79 | printk("Too many stack frames (stack possibly corrupted), giving up...\n"); |
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80 | } else { |
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81 | if (i % 5) |
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82 | printk("\n"); |
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83 | } |
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84 | } |
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85 | |
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86 | void C_exception_handler(BSP_Exception_frame *excPtr) |
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87 | { |
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88 | static int nest = 0; |
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89 | |
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90 | int recoverable = 0; |
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91 | rtems_id id = 0; |
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92 | int synch; |
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93 | unsigned n; |
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94 | rtems_status_code sc; |
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95 | |
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96 | /* Catch recursion */ |
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97 | nest++; |
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98 | |
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99 | if (nest > 2) { |
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100 | /* maybe printk() or dereferencing excPtr caused an exception; |
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101 | * die silently... |
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102 | */ |
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103 | while (1); |
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104 | } |
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105 | |
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106 | synch = (int) excPtr->_EXC_number >= 0; |
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107 | n = excPtr->_EXC_number & 0x7fff; |
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108 | |
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109 | printk("Exception handler called for exception %d (0x%x)\n", n, n); |
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110 | printk("\t Next PC or Address of fault = %08x\n", excPtr->EXC_SRR0); |
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111 | printk("\t Saved MSR = %08x\n", excPtr->EXC_SRR1); |
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112 | |
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113 | if (nest > 1) { |
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114 | printk("Recursion in the exception handler detected; I'll spin now...\n"); |
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115 | while (1); |
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116 | } |
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117 | |
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118 | /* Try to find out more about the context where this happened */ |
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119 | printk("\t Context: "); |
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120 | if (rtems_interrupt_is_in_progress()) { |
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121 | printk("ISR"); |
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122 | } else if (!_Thread_Executing) { |
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123 | printk("Initialization (_Thread_Executing not available yet)"); |
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124 | } else { |
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125 | if (RTEMS_SUCCESSFUL != (sc = rtems_task_ident(RTEMS_SELF, RTEMS_LOCAL, &id))) { |
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126 | printk("Unable to determine faulting task; rtems_task_ident() returned %u", sc); |
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127 | id = 0; |
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128 | } else { |
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129 | printk("Task ID 0x%08x", id); |
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130 | } |
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131 | } |
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132 | printk("\n"); |
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133 | |
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134 | /* Dump registers */ |
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135 | |
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136 | printk("\t R0 = %08x", excPtr->GPR0); |
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137 | if (synch) { |
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138 | printk(" R1 = %08x", excPtr->GPR1); |
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139 | printk(" R2 = %08x", excPtr->GPR2); |
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140 | } else { |
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141 | printk(" "); |
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142 | printk(" "); |
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143 | } |
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144 | printk(" R3 = %08x\n", excPtr->GPR3); |
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145 | printk("\t R4 = %08x", excPtr->GPR4); |
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146 | printk(" R5 = %08x", excPtr->GPR5); |
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147 | printk(" R6 = %08x", excPtr->GPR6); |
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148 | printk(" R7 = %08x\n", excPtr->GPR7); |
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149 | printk("\t R8 = %08x", excPtr->GPR8); |
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150 | printk(" R9 = %08x", excPtr->GPR9); |
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151 | printk(" R10 = %08x", excPtr->GPR10); |
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152 | printk(" R11 = %08x\n", excPtr->GPR11); |
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153 | printk("\t R12 = %08x", excPtr->GPR12); |
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154 | if (synch) { |
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155 | printk(" R13 = %08x", excPtr->GPR13); |
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156 | printk(" R14 = %08x", excPtr->GPR14); |
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157 | printk(" R15 = %08x\n", excPtr->GPR15); |
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158 | printk("\t R16 = %08x", excPtr->GPR16); |
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159 | printk(" R17 = %08x", excPtr->GPR17); |
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160 | printk(" R18 = %08x", excPtr->GPR18); |
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161 | printk(" R19 = %08x\n", excPtr->GPR19); |
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162 | printk("\t R20 = %08x", excPtr->GPR20); |
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163 | printk(" R21 = %08x", excPtr->GPR21); |
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164 | printk(" R22 = %08x", excPtr->GPR22); |
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165 | printk(" R23 = %08x\n", excPtr->GPR23); |
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166 | printk("\t R24 = %08x", excPtr->GPR24); |
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167 | printk(" R25 = %08x", excPtr->GPR25); |
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168 | printk(" R26 = %08x", excPtr->GPR26); |
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169 | printk(" R27 = %08x\n", excPtr->GPR27); |
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170 | printk("\t R28 = %08x", excPtr->GPR28); |
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171 | printk(" R29 = %08x", excPtr->GPR29); |
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172 | printk(" R30 = %08x", excPtr->GPR30); |
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173 | printk(" R31 = %08x\n", excPtr->GPR31); |
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174 | } else { |
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175 | printk("\n"); |
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176 | } |
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177 | printk("\t CR = %08x\n", excPtr->EXC_CR); |
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178 | printk("\t CTR = %08x\n", excPtr->EXC_CTR); |
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179 | printk("\t XER = %08x\n", excPtr->EXC_XER); |
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180 | printk("\t LR = %08x\n", excPtr->EXC_LR); |
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181 | |
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182 | /* Would be great to print DAR but unfortunately, |
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183 | * that is not portable across different CPUs. |
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184 | * AFAIK on classic PPC DAR is SPR 19, on the |
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185 | * 405 we have DEAR = SPR 0x3d5 and booE says |
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186 | * DEAR = SPR 61 :-( |
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187 | */ |
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188 | if (ppc_exc_get_DAR) { |
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189 | printk("\t DAR = %08x\n", ppc_exc_get_DAR()); |
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190 | } |
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191 | |
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192 | BSP_printStackTrace(excPtr); |
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193 | |
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194 | if (excPtr->_EXC_number == ASM_DEC_VECTOR) |
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195 | recoverable = 1; |
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196 | if (excPtr->_EXC_number == ASM_SYS_VECTOR) |
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197 | #ifdef TEST_RAW_EXCEPTION_CODE |
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198 | recoverable = 1; |
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199 | #else |
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200 | recoverable = 0; |
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201 | #endif |
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202 | if (!recoverable) { |
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203 | if (id) { |
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204 | printk("Suspending faulting task (0x%08x)\n", id); |
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205 | /* Unnest here because rtems_task_suspend() never returns */ |
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206 | nest--; |
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207 | rtems_task_suspend(id); |
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208 | } else { |
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209 | printk("unrecoverable exception!!! Push reset button\n"); |
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210 | while (1); |
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211 | } |
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212 | } else { |
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213 | nest--; |
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214 | } |
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215 | } |
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