1 | /* |
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2 | * vectors_init.c Exception hanlding initialisation (and generic handler). |
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3 | * |
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4 | * This include file describe the data structure and the functions implemented |
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5 | * by rtems to handle exceptions. |
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6 | * |
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7 | * CopyRight (C) 1999 valette@crf.canon.fr |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in found in the file LICENSE in this distribution or at |
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11 | * http://www.rtems.com/license/LICENSE. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | #include <rtems.h> |
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16 | #include <bsp.h> |
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17 | |
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18 | #include <rtems/bspIo.h> |
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19 | |
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20 | #include <bsp/vectors.h> |
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21 | #include <libcpu/raw_exception.h> |
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22 | #include <libcpu/spr.h> |
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23 | #include <libcpu/cpuIdent.h> |
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24 | |
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25 | static rtems_raw_except_global_settings exception_config; |
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26 | static rtems_raw_except_connect_data exception_table[LAST_VALID_EXC + 1]; |
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27 | |
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28 | extern exception_handler_t globalExceptHdl; |
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29 | exception_handler_t globalExceptHdl; |
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30 | |
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31 | /* T. Straumann: provide a stack trace |
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32 | * <strauman@slac.stanford.edu>, 6/26/2001 |
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33 | */ |
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34 | typedef struct LRFrameRec_ { |
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35 | struct LRFrameRec_ *frameLink; |
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36 | unsigned long *lr; |
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37 | } LRFrameRec, *LRFrame; |
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38 | |
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39 | #define STACK_CLAMP 50 /* in case we have a corrupted bottom */ |
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40 | |
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41 | SPR_RO(LR) |
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42 | |
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43 | void |
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44 | BSP_printStackTrace(BSP_Exception_frame* excPtr) |
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45 | { |
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46 | LRFrame f; |
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47 | int i; |
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48 | LRFrame sp; |
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49 | void *lr; |
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50 | |
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51 | printk("Stack Trace: \n "); |
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52 | if (excPtr) { |
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53 | printk("IP: 0x%08x, ",excPtr->EXC_SRR0); |
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54 | sp=(LRFrame)excPtr->GPR1; |
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55 | lr=(void*)excPtr->EXC_LR; |
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56 | } else { |
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57 | /* there's no macro for this */ |
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58 | __asm__ __volatile__("mr %0, 1":"=r"(sp)); |
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59 | lr=(LRFrame)_read_LR(); |
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60 | } |
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61 | printk("LR: 0x%08x\n",lr); |
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62 | for (f=(LRFrame)sp, i=0; f->frameLink && i<STACK_CLAMP; f=f->frameLink) { |
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63 | printk("--^ 0x%08x", (long)(f->frameLink->lr)); |
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64 | if (!(++i%5)) |
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65 | printk("\n"); |
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66 | } |
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67 | if (i>=STACK_CLAMP) { |
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68 | printk("Too many stack frames (stack possibly corrupted), giving up...\n"); |
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69 | } else { |
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70 | if (i%5) |
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71 | printk("\n"); |
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72 | } |
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73 | } |
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74 | |
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75 | void C_exception_handler(BSP_Exception_frame* excPtr) |
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76 | { |
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77 | int recoverable = 0; |
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78 | |
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79 | printk("exception handler called for exception %d\n", excPtr->_EXC_number); |
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80 | printk("\t Next PC or Address of fault = %x\n", excPtr->EXC_SRR0); |
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81 | printk("\t Saved MSR = %x\n", excPtr->EXC_SRR1); |
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82 | printk("\t R0 = %x\n", excPtr->GPR0); |
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83 | printk("\t R1 = %x\n", excPtr->GPR1); |
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84 | printk("\t R2 = %x\n", excPtr->GPR2); |
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85 | printk("\t R3 = %x\n", excPtr->GPR3); |
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86 | printk("\t R4 = %x\n", excPtr->GPR4); |
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87 | printk("\t R5 = %x\n", excPtr->GPR5); |
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88 | printk("\t R6 = %x\n", excPtr->GPR6); |
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89 | printk("\t R7 = %x\n", excPtr->GPR7); |
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90 | printk("\t R8 = %x\n", excPtr->GPR8); |
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91 | printk("\t R9 = %x\n", excPtr->GPR9); |
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92 | printk("\t R10 = %x\n", excPtr->GPR10); |
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93 | printk("\t R11 = %x\n", excPtr->GPR11); |
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94 | printk("\t R12 = %x\n", excPtr->GPR12); |
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95 | printk("\t R13 = %x\n", excPtr->GPR13); |
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96 | printk("\t R14 = %x\n", excPtr->GPR14); |
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97 | printk("\t R15 = %x\n", excPtr->GPR15); |
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98 | printk("\t R16 = %x\n", excPtr->GPR16); |
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99 | printk("\t R17 = %x\n", excPtr->GPR17); |
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100 | printk("\t R18 = %x\n", excPtr->GPR18); |
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101 | printk("\t R19 = %x\n", excPtr->GPR19); |
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102 | printk("\t R20 = %x\n", excPtr->GPR20); |
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103 | printk("\t R21 = %x\n", excPtr->GPR21); |
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104 | printk("\t R22 = %x\n", excPtr->GPR22); |
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105 | printk("\t R23 = %x\n", excPtr->GPR23); |
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106 | printk("\t R24 = %x\n", excPtr->GPR24); |
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107 | printk("\t R25 = %x\n", excPtr->GPR25); |
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108 | printk("\t R26 = %x\n", excPtr->GPR26); |
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109 | printk("\t R27 = %x\n", excPtr->GPR27); |
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110 | printk("\t R28 = %x\n", excPtr->GPR28); |
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111 | printk("\t R29 = %x\n", excPtr->GPR29); |
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112 | printk("\t R30 = %x\n", excPtr->GPR30); |
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113 | printk("\t R31 = %x\n", excPtr->GPR31); |
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114 | printk("\t CR = %x\n", excPtr->EXC_CR); |
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115 | printk("\t CTR = %x\n", excPtr->EXC_CTR); |
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116 | printk("\t XER = %x\n", excPtr->EXC_XER); |
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117 | printk("\t LR = %x\n", excPtr->EXC_LR); |
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118 | printk("\t DAR = %x\n", excPtr->EXC_DAR); |
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119 | |
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120 | BSP_printStackTrace(excPtr); |
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121 | |
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122 | if (excPtr->_EXC_number == ASM_DEC_VECTOR) |
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123 | recoverable = 1; |
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124 | if (excPtr->_EXC_number == ASM_SYS_VECTOR) |
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125 | #ifdef TEST_RAW_EXCEPTION_CODE |
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126 | recoverable = 1; |
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127 | #else |
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128 | recoverable = 0; |
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129 | #endif |
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130 | if (!recoverable) { |
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131 | printk("unrecoverable exception!!! Push reset button\n"); |
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132 | while(1); |
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133 | } |
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134 | } |
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135 | |
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136 | void nop_except_enable(const rtems_raw_except_connect_data* ptr) |
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137 | { |
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138 | } |
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139 | int except_always_enabled(const rtems_raw_except_connect_data* ptr) |
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140 | { |
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141 | return 1; |
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142 | } |
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143 | |
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144 | int mpc60x_vector_is_valid(rtems_vector vector); |
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145 | |
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146 | void initialize_exceptions() |
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147 | { |
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148 | int i; |
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149 | int has_shadowed_gprs = 0; |
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150 | |
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151 | /* |
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152 | * Initialize pointer used by low level execption handling |
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153 | */ |
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154 | globalExceptHdl = C_exception_handler; |
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155 | /* |
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156 | * Put default_exception_vector_code_prolog at relevant exception |
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157 | * code entry addresses |
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158 | */ |
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159 | exception_config.exceptSize = LAST_VALID_EXC + 1; |
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160 | exception_config.rawExceptHdlTbl = &exception_table[0]; |
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161 | exception_config.defaultRawEntry.exceptIndex = 0; |
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162 | exception_config.defaultRawEntry.hdl.vector = 0; |
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163 | exception_config.defaultRawEntry.hdl.raw_hdl = default_exception_vector_code_prolog; |
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164 | /* |
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165 | * Note that next line the '&' before default_exception_vector_code_prolog_size |
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166 | * is not a bug as it is defined a .set directly in asm... |
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167 | */ |
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168 | exception_config.defaultRawEntry.hdl.raw_hdl_size = (unsigned) default_exception_vector_code_prolog_size; |
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169 | |
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170 | switch ( get_ppc_cpu_type() ) { |
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171 | case PPC_603e: |
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172 | case PPC_8240: |
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173 | has_shadowed_gprs = 1; |
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174 | default: break; |
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175 | } |
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176 | for (i=0; i <= exception_config.exceptSize; i++) { |
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177 | if (!mpc60x_vector_is_valid (i)) { |
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178 | continue; |
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179 | } |
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180 | exception_table[i].exceptIndex = i; |
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181 | if ( has_shadowed_gprs |
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182 | && ( ASM_IMISS_VECTOR == i |
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183 | || ASM_DLMISS_VECTOR == i |
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184 | || ASM_DSMISS_VECTOR == i ) ) { |
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185 | exception_table[i].hdl.raw_hdl = tgpr_clr_exception_vector_code_prolog; |
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186 | exception_table[i].hdl.raw_hdl_size = (unsigned)tgpr_clr_exception_vector_code_prolog_size; |
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187 | } else { |
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188 | exception_table[i].hdl = exception_config.defaultRawEntry.hdl; |
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189 | } |
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190 | exception_table[i].hdl.vector = i; |
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191 | exception_table[i].on = nop_except_enable; |
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192 | exception_table[i].off = nop_except_enable; |
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193 | exception_table[i].isOn = except_always_enabled; |
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194 | } |
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195 | if (!mpc60x_init_exceptions(&exception_config)) { |
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196 | BSP_panic("Exception handling initialization failed\n"); |
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197 | } |
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198 | #ifdef RTEMS_DEBUG |
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199 | else { |
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200 | printk("Exception handling initialization done\n"); |
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201 | } |
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202 | #endif |
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203 | } |
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