1 | /* |
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2 | * Stack Overflow Check User Extension Set |
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3 | * |
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4 | * NOTE: This extension set automatically determines at |
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5 | * initialization time whether the stack for this |
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6 | * CPU grows up or down and installs the correct |
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7 | * extension routines for that direction. |
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8 | * |
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9 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * All rights assigned to U.S. Government, 1994. |
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12 | * |
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13 | * This material may be reproduced by or for the U.S. Government pursuant |
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14 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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15 | * notice must appear in all copies of this file and its derivatives. |
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16 | * |
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17 | * $Id$ |
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18 | * |
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19 | */ |
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20 | |
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21 | #include <rtems/system.h> |
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22 | #include <rtems/extension.h> |
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23 | #include <rtems/fatal.h> |
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24 | #include <rtems/heap.h> |
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25 | #include <rtems/stack.h> |
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26 | #include <rtems/thread.h> |
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27 | #ifdef XXX_RTEMS_H_FIXED |
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28 | #include <bsp.h> |
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29 | #else |
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30 | #include <rtems/config.h> |
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31 | extern rtems_configuration_table BSP_Configuration; |
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32 | #endif |
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33 | |
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34 | #include <assert.h> |
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35 | #include <stdio.h> |
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36 | #include <string.h> |
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37 | #include <stdlib.h> |
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38 | |
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39 | #include "stackchk.h" |
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40 | #include "internal.h" |
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41 | |
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42 | /* |
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43 | * This variable contains the name of the task which "blew" the stack. |
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44 | * It is NULL if the system is all right. |
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45 | */ |
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46 | |
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47 | Thread_Control *Stack_check_Blown_task; |
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48 | |
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49 | /* |
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50 | * The extension table for the stack checker. |
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51 | */ |
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52 | |
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53 | rtems_extensions_table Stack_check_Extension_table = { |
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54 | Stack_check_Create_extension, /* rtems_task_create */ |
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55 | 0, /* rtems_task_start */ |
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56 | 0, /* rtems_task_restart */ |
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57 | 0, /* rtems_task_delete */ |
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58 | Stack_check_Switch_extension, /* task_switch */ |
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59 | Stack_check_Begin_extension, /* task_begin */ |
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60 | 0, /* task_exitted */ |
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61 | Stack_check_Fatal_extension, /* fatal */ |
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62 | }; |
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63 | |
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64 | /* |
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65 | * The "magic pattern" used to mark the end of the stack. |
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66 | */ |
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67 | |
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68 | Stack_check_Control Stack_check_Pattern; |
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69 | |
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70 | /* |
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71 | * Where the pattern goes in the stack area is dependent upon |
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72 | * whether the stack grow to the high or low area of the memory. |
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73 | * |
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74 | */ |
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75 | |
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76 | #if ( CPU_STACK_GROWS_UP == TRUE ) |
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77 | |
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78 | #define Stack_check_Get_pattern_area( _the_stack ) \ |
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79 | ((Stack_check_Control *) \ |
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80 | ((_the_stack)->area + (_the_stack)->size - sizeof( Stack_check_Control ) )) |
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81 | |
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82 | #define Stack_check_Calculate_used( _low, _size, _high_water ) \ |
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83 | ((_high_water) - (_low)) |
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84 | |
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85 | #define Stack_check_usable_stack_start(_the_stack) \ |
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86 | ((_the_stack)->area) |
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87 | |
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88 | #else |
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89 | |
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90 | #define Stack_check_Get_pattern_area( _the_stack ) \ |
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91 | ((Stack_check_Control *) ((_the_stack)->area + HEAP_OVERHEAD)) |
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92 | |
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93 | #define Stack_check_Calculate_used( _low, _size, _high_water) \ |
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94 | ( ((_low) + (_size)) - (_high_water) ) |
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95 | |
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96 | #define Stack_check_usable_stack_start(_the_stack) \ |
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97 | ((_the_stack)->area + sizeof(Stack_check_Control)) |
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98 | |
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99 | #endif |
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100 | |
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101 | #define Stack_check_usable_stack_size(_the_stack) \ |
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102 | ((_the_stack)->size - sizeof(Stack_check_Control)) |
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103 | |
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104 | |
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105 | /* |
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106 | * Do we have an interrupt stack? |
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107 | * XXX it would sure be nice if the interrupt stack were also |
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108 | * stored in a "stack" structure! |
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109 | */ |
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110 | |
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111 | |
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112 | Stack_Control stack_check_interrupt_stack; |
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113 | |
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114 | /* |
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115 | * Fill an entire stack area with BYTE_PATTERN. |
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116 | * This will be used by a Fatal extension to check for |
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117 | * amount of actual stack used |
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118 | */ |
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119 | |
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120 | void |
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121 | stack_check_dope_stack(Stack_Control *stack) |
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122 | { |
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123 | memset(stack->area, BYTE_PATTERN, stack->size); |
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124 | } |
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125 | |
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126 | |
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127 | /*PAGE |
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128 | * |
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129 | * Stack_check_Initialize |
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130 | */ |
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131 | |
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132 | unsigned32 stack_check_initialized = 0; |
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133 | |
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134 | void Stack_check_Initialize( void ) |
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135 | { |
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136 | rtems_status_code status; |
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137 | Objects_Id id_ignored; |
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138 | unsigned32 *p; |
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139 | |
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140 | if (stack_check_initialized) |
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141 | return; |
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142 | |
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143 | /* |
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144 | * Dope the pattern and fill areas |
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145 | */ |
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146 | |
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147 | for ( p = Stack_check_Pattern.pattern; |
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148 | p < &Stack_check_Pattern.pattern[PATTERN_SIZE_WORDS]; |
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149 | p += 4 |
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150 | ) |
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151 | { |
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152 | p[0] = 0xFEEDF00D; /* FEED FOOD to BAD DOG */ |
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153 | p[1] = 0x0BAD0D06; |
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154 | p[2] = 0xDEADF00D; /* DEAD FOOD GOOD DOG */ |
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155 | p[3] = 0x600D0D06; |
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156 | }; |
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157 | |
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158 | status = rtems_extension_create( |
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159 | rtems_build_name( 'S', 'T', 'C', 'K' ), |
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160 | &Stack_check_Extension_table, |
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161 | &id_ignored |
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162 | ); |
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163 | assert ( status == RTEMS_SUCCESSFUL ); |
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164 | |
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165 | Stack_check_Blown_task = 0; |
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166 | |
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167 | /* |
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168 | * If installed by a task, that task will not get setup properly |
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169 | * since it missed out on the create hook. This will cause a |
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170 | * failure on first switch out of that task. |
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171 | * So pretend here that we actually ran create and begin extensions. |
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172 | */ |
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173 | |
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174 | if (_Thread_Executing) |
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175 | { |
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176 | Stack_check_Create_extension(_Thread_Executing, _Thread_Executing); |
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177 | } |
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178 | |
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179 | /* |
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180 | * If appropriate, setup the interrupt stack for high water testing |
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181 | * also. |
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182 | */ |
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183 | if (_CPU_Interrupt_stack_low && _CPU_Interrupt_stack_high) |
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184 | { |
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185 | stack_check_interrupt_stack.area = _CPU_Interrupt_stack_low; |
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186 | stack_check_interrupt_stack.size = _CPU_Interrupt_stack_high - |
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187 | _CPU_Interrupt_stack_low; |
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188 | |
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189 | stack_check_dope_stack(&stack_check_interrupt_stack); |
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190 | } |
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191 | |
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192 | stack_check_initialized = 1; |
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193 | } |
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194 | |
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195 | /*PAGE |
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196 | * |
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197 | * Stack_check_Create_extension |
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198 | */ |
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199 | |
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200 | void Stack_check_Create_extension( |
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201 | Thread_Control *running, |
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202 | Thread_Control *the_thread |
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203 | ) |
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204 | { |
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205 | if (the_thread && (the_thread != _Thread_Executing)) |
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206 | stack_check_dope_stack(&the_thread->Start.Initial_stack); |
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207 | } |
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208 | |
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209 | /*PAGE |
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210 | * |
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211 | * Stack_check_Begin_extension |
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212 | */ |
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213 | |
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214 | void Stack_check_Begin_extension( |
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215 | Thread_Control *the_thread |
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216 | ) |
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217 | { |
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218 | Stack_check_Control *the_pattern; |
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219 | |
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220 | if ( the_thread->Object.id == 0 ) /* skip system tasks */ |
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221 | return; |
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222 | |
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223 | the_pattern = Stack_check_Get_pattern_area(&the_thread->Start.Initial_stack); |
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224 | |
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225 | *the_pattern = Stack_check_Pattern; |
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226 | } |
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227 | |
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228 | /*PAGE |
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229 | * |
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230 | * Stack_check_report_blown_task |
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231 | * Report a blown stack. Needs to be a separate routine |
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232 | * so that interrupt handlers can use this too. |
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233 | * |
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234 | * Caller must have set the Stack_check_Blown_task. |
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235 | * |
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236 | * NOTE: The system is in a questionable state... we may not get |
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237 | * the following message out. |
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238 | */ |
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239 | |
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240 | void Stack_check_report_blown_task(void) |
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241 | { |
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242 | Stack_Control *stack; |
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243 | Thread_Control *running; |
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244 | |
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245 | running = Stack_check_Blown_task; |
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246 | stack = &running->Start.Initial_stack; |
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247 | |
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248 | fprintf( |
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249 | stderr, |
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250 | "BLOWN STACK!!! Offending task(%p): id=0x%08x; name=0x%08x", |
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251 | running, |
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252 | running->Object.id, |
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253 | running->name); |
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254 | fflush(stderr); |
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255 | |
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256 | if (BSP_Configuration.User_multiprocessing_table) |
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257 | fprintf( |
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258 | stderr, |
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259 | "; node=%d\n", |
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260 | BSP_Configuration.User_multiprocessing_table->node |
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261 | ); |
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262 | else |
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263 | fprintf(stderr, "\n"); |
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264 | fflush(stderr); |
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265 | |
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266 | fprintf( |
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267 | stderr, |
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268 | " stack covers range 0x%08x - 0x%08x (%d bytes)\n", |
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269 | (unsigned32) stack->area, |
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270 | (unsigned32) stack->area + stack->size - 1, |
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271 | (unsigned32) stack->size); |
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272 | fflush(stderr); |
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273 | |
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274 | fprintf( |
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275 | stderr, |
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276 | " Damaged pattern begins at 0x%08x and is %d bytes long\n", |
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277 | (unsigned32) Stack_check_Get_pattern_area(stack), PATTERN_SIZE_BYTES); |
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278 | fflush(stderr); |
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279 | |
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280 | rtems_fatal_error_occurred( (unsigned32) "STACK BLOWN" ); |
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281 | } |
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282 | |
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283 | /*PAGE |
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284 | * |
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285 | * Stack_check_Switch_extension |
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286 | */ |
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287 | |
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288 | void Stack_check_Switch_extension( |
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289 | Thread_Control *running, |
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290 | Thread_Control *heir |
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291 | ) |
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292 | { |
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293 | if ( running->Object.id == 0 ) /* skip system tasks */ |
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294 | return; |
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295 | |
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296 | if (0 != memcmp( (void *) Stack_check_Get_pattern_area( &running->Start.Initial_stack)->pattern, |
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297 | (void *) Stack_check_Pattern.pattern, |
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298 | PATTERN_SIZE_BYTES)) |
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299 | { |
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300 | Stack_check_Blown_task = running; |
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301 | Stack_check_report_blown_task(); |
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302 | } |
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303 | } |
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304 | |
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305 | void *Stack_check_find_high_water_mark( |
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306 | const void *s, |
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307 | size_t n |
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308 | ) |
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309 | { |
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310 | const unsigned32 *base, *ebase; |
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311 | unsigned32 length; |
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312 | |
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313 | base = s; |
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314 | length = n/4; |
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315 | |
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316 | #if ( CPU_STACK_GROWS_UP == TRUE ) |
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317 | /* |
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318 | * start at higher memory and find first word that does not |
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319 | * match pattern |
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320 | */ |
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321 | |
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322 | base += length - 1; |
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323 | for (ebase = s; base > ebase; base--) |
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324 | if (*base != U32_PATTERN) |
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325 | return (void *) base; |
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326 | #else |
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327 | /* |
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328 | * start at lower memory and find first word that does not |
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329 | * match pattern |
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330 | */ |
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331 | |
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332 | base += 4; |
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333 | for (ebase = base + length; base < ebase; base++) |
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334 | if (*base != U32_PATTERN) |
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335 | return (void *) base; |
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336 | #endif |
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337 | |
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338 | return (void *)0; |
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339 | } |
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340 | |
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341 | /*PAGE |
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342 | * |
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343 | * Stack_check_Dump_threads_usage |
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344 | * Try to print out how much stack was actually used by the task. |
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345 | * |
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346 | */ |
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347 | |
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348 | void Stack_check_Dump_threads_usage( |
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349 | Thread_Control *the_thread |
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350 | ) |
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351 | { |
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352 | unsigned32 size, used; |
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353 | void *low; |
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354 | void *high_water_mark; |
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355 | Stack_Control *stack; |
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356 | |
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357 | if ( !the_thread ) |
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358 | return; |
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359 | |
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360 | /* |
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361 | * XXX HACK to get to interrupt stack |
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362 | */ |
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363 | |
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364 | if (the_thread == (Thread_Control *) -1) |
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365 | { |
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366 | if (stack_check_interrupt_stack.area) |
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367 | { |
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368 | stack = &stack_check_interrupt_stack; |
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369 | the_thread = 0; |
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370 | } |
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371 | else |
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372 | return; |
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373 | } |
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374 | else |
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375 | stack = &the_thread->Start.Initial_stack; |
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376 | |
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377 | low = Stack_check_usable_stack_start(stack); |
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378 | size = Stack_check_usable_stack_size(stack); |
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379 | |
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380 | high_water_mark = Stack_check_find_high_water_mark(low, size); |
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381 | |
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382 | if ( high_water_mark ) |
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383 | used = Stack_check_Calculate_used( low, size, high_water_mark ); |
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384 | else |
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385 | used = 0; |
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386 | |
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387 | printf( "0x%08x 0x%08x 0x%08x 0x%08x %8d %8d\n", |
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388 | the_thread ? the_thread->Object.id : ~0, |
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389 | the_thread ? the_thread->name : |
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390 | rtems_build_name('I', 'N', 'T', 'R'), |
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391 | (unsigned32) stack->area, |
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392 | (unsigned32) stack->area + (unsigned32) stack->size - 1, |
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393 | size, |
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394 | used |
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395 | ); |
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396 | } |
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397 | |
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398 | /*PAGE |
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399 | * |
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400 | * Stack_check_Fatal_extension |
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401 | */ |
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402 | |
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403 | void Stack_check_Fatal_extension( unsigned32 status ) |
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404 | { |
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405 | if (status == 0) |
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406 | Stack_check_Dump_usage(); |
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407 | } |
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408 | |
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409 | |
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410 | /*PAGE |
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411 | * |
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412 | * Stack_check_Dump_usage |
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413 | */ |
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414 | |
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415 | void Stack_check_Dump_usage( void ) |
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416 | { |
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417 | unsigned32 i; |
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418 | Thread_Control *the_thread; |
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419 | unsigned32 hit_running = 0; |
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420 | |
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421 | if (stack_check_initialized == 0) |
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422 | return; |
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423 | |
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424 | printf( |
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425 | " ID NAME LOW HIGH AVAILABLE USED\n" |
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426 | ); |
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427 | for ( i=1 ; i<_Thread_Information.maximum ; i++ ) { |
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428 | the_thread = (Thread_Control *)_Thread_Information.local_table[ i ]; |
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429 | Stack_check_Dump_threads_usage( the_thread ); |
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430 | if ( the_thread == _Thread_Executing ) |
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431 | hit_running = 1; |
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432 | } |
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433 | |
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434 | if ( !hit_running ) |
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435 | Stack_check_Dump_threads_usage( _Thread_Executing ); |
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436 | |
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437 | /* dump interrupt stack info if any */ |
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438 | Stack_check_Dump_threads_usage((Thread_Control *) -1); |
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439 | } |
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440 | |
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