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1 //========================================================================== |
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2 // |
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3 // common/except.cxx |
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4 // |
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5 // Exception handling implementation |
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6 // |
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7 //========================================================================== |
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8 //####COPYRIGHTBEGIN#### |
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9 // |
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10 // ------------------------------------------- |
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11 // The contents of this file are subject to the Cygnus eCos Public License |
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12 // Version 1.0 (the "License"); you may not use this file except in |
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13 // compliance with the License. You may obtain a copy of the License at |
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14 // http://sourceware.cygnus.com/ecos |
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15 // |
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16 // Software distributed under the License is distributed on an "AS IS" |
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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18 // License for the specific language governing rights and limitations under |
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19 // the License. |
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20 // |
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21 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //========================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): nickg |
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33 // Contributors: nickg |
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34 // Date: 1998-04-09 |
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35 // Purpose: Exception handling implementation |
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36 // Description: This file contains the code that registers and delivers |
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37 // exceptions. |
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38 // |
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39 //####DESCRIPTIONEND#### |
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40 // |
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41 //========================================================================== |
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42 |
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43 #include <pkgconf/kernel.h> |
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44 |
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45 #include <cyg/kernel/ktypes.h> // base kernel types |
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46 #include <cyg/infra/cyg_trac.h> // tracing macros |
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47 #include <cyg/infra/cyg_ass.h> // assertion macros |
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48 #include <cyg/kernel/instrmnt.h> // instrumentation |
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49 |
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50 #include <cyg/kernel/except.hxx> // our header |
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51 |
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52 #include <cyg/hal/hal_arch.h> // architecture definitions |
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53 #include <cyg/hal/hal_intr.h> // vector definitions |
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54 |
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55 #include <cyg/kernel/thread.hxx> // thread interface |
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56 |
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57 #include <cyg/kernel/thread.inl> // thread inlines |
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58 |
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59 #ifdef CYGPKG_KERNEL_EXCEPTIONS |
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60 |
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61 // ------------------------------------------------------------------------- |
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62 // Null exception handler. This is used to capture exceptions that are |
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63 // not caught by user supplied handlers. |
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64 |
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65 void cyg_null_exception_handler( |
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66 CYG_ADDRWORD data, // user supplied data |
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67 cyg_code exception_number, // exception being raised |
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68 CYG_ADDRWORD exception_info // any exception specific info |
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69 ) |
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70 { |
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71 CYG_TRACE1( 1, "Uncaught exception: %d", exception_number); |
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72 } |
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73 |
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74 // ------------------------------------------------------------------------- |
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75 // Exception Controller constructor. |
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76 |
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77 Cyg_Exception_Control::Cyg_Exception_Control() |
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78 { |
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79 #ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE |
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80 |
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81 for( int i = 0; i < CYG_EXCEPTION_COUNT ; i++ ) |
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82 exception_handler[i] = cyg_null_exception_handler, |
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83 exception_data[i] = 0; |
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84 #else |
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85 |
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86 exception_handler = cyg_null_exception_handler; |
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87 exception_data = 0; |
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88 |
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89 #endif |
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90 |
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91 } |
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92 |
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93 // ------------------------------------------------------------------------- |
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94 // Exception registation. Stores the handler function and data to be used |
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95 // for handling the given exception number. Where exceptions are not decoded |
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96 // only a single handler may be registered for all exceptions. This function |
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97 // also returns the old values of the exception handler and data to allow |
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98 // chaining to be implemented. |
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99 |
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100 void Cyg_Exception_Control::register_exception( |
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101 cyg_code exception_number, // exception number |
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102 cyg_exception_handler handler, // handler function |
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103 CYG_ADDRWORD data, // data argument |
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104 cyg_exception_handler **old_handler, // handler function |
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105 CYG_ADDRWORD *old_data // data argument |
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106 ) |
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107 { |
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108 CYG_REPORT_FUNCTION(); |
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109 |
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110 CYG_ASSERT( exception_number <= CYG_EXCEPTION_MAX, |
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111 "Out of range exception number"); |
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112 CYG_ASSERT( exception_number >= CYG_EXCEPTION_MIN, |
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113 "Out of range exception number"); |
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114 |
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115 |
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116 // Should we complain if there is already a registered |
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117 // handler, or should we just replace is silently? |
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118 |
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119 #ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE |
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120 |
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121 if( old_handler != NULL ) |
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122 *old_handler = exception_handler[exception_number]; |
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123 if( old_data != NULL ) |
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124 *old_data = exception_data[exception_number]; |
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125 exception_handler[exception_number] = handler; |
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126 exception_data[exception_number] = data; |
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127 |
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128 #else |
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129 |
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130 if( old_handler != NULL ) |
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131 *old_handler = exception_handler; |
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132 if( old_data != NULL ) |
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133 *old_data = exception_data; |
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134 exception_handler = handler; |
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135 exception_data = data; |
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136 |
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137 #endif |
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138 |
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139 } |
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140 |
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141 // ------------------------------------------------------------------------- |
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142 // Exception deregistation. Revert the handler for the exception number |
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143 // to the default. |
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144 |
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145 void Cyg_Exception_Control::deregister_exception( |
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146 cyg_code exception_number // exception number |
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147 ) |
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148 { |
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149 CYG_REPORT_FUNCTION(); |
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150 |
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151 CYG_ASSERT( exception_number <= CYG_EXCEPTION_MAX, |
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152 "Out of range exception number"); |
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153 CYG_ASSERT( exception_number >= CYG_EXCEPTION_MIN, |
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154 "Out of range exception number"); |
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155 |
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156 #ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE |
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157 |
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158 exception_handler[exception_number] = cyg_null_exception_handler; |
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159 exception_data[exception_number] = 0; |
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160 |
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161 #else |
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162 |
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163 exception_handler = cyg_null_exception_handler; |
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164 exception_data = 0; |
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165 |
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166 #endif |
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167 |
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168 } |
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169 |
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170 // ------------------------------------------------------------------------- |
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171 // Exception delivery. Call the appropriate exception handler. |
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172 |
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173 void Cyg_Exception_Control::deliver_exception( |
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174 cyg_code exception_number, // exception being raised |
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175 CYG_ADDRWORD exception_info // exception specific info |
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176 ) |
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177 { |
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178 cyg_exception_handler *handler = NULL; |
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179 CYG_ADDRWORD data = 0; |
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180 |
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181 CYG_ASSERT( exception_number <= CYG_EXCEPTION_MAX, |
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182 "Out of range exception number"); |
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183 CYG_ASSERT( exception_number >= CYG_EXCEPTION_MIN, |
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184 "Out of range exception number"); |
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185 |
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186 #ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE |
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187 |
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188 handler = exception_handler[exception_number]; |
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189 data = exception_data[exception_number]; |
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190 |
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191 #else |
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192 |
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193 handler = exception_handler; |
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194 data = exception_data; |
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195 |
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196 #endif |
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197 |
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198 // The handler will always be a callable function: either the user's |
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199 // registered function or the null handler. So it is always safe to |
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200 // just go ahead and call it. |
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201 |
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202 handler( data, exception_number, exception_info ); |
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203 |
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204 } |
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205 |
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206 // ------------------------------------------------------------------------- |
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207 // Exception delivery function called from the HAL as a result of a |
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208 // hardware exception being raised. |
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209 |
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210 externC void deliver_exception( CYG_WORD code, CYG_ADDRWORD data ) |
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211 { |
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212 Cyg_Thread::self()->deliver_exception( code, data ); |
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213 } |
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214 |
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215 // ------------------------------------------------------------------------- |
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216 // Where exceptions are global, there is a single static instance of the |
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217 // exception control object. Define it here. |
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218 |
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219 #ifdef CYGSEM_KERNEL_EXCEPTIONS_GLOBAL |
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220 |
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221 Cyg_Exception_Control Cyg_Thread::exception_control; |
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222 |
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223 #endif |
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224 |
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225 // ------------------------------------------------------------------------- |
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226 |
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227 #endif |
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228 |
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229 // ------------------------------------------------------------------------- |
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230 // EOF common/except.cxx |
