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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) 1998,1999 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, jlarmour |
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34 // Date: 1999-02-16 |
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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 |
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66 cyg_null_exception_handler( |
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67 CYG_ADDRWORD data, // user supplied data |
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68 cyg_code exception_number, // exception being raised |
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69 CYG_ADDRWORD exception_info // any exception specific info |
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70 ) |
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71 { |
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72 CYG_REPORT_FUNCTION(); |
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73 CYG_REPORT_FUNCARG3("data=%08x, exception=%d, info=%08x", data, |
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74 exception_number, exception_info); |
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75 CYG_TRACE1( 1, "Uncaught exception: %d", exception_number); |
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76 CYG_REPORT_RETURN(); |
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77 } |
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78 |
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79 // ------------------------------------------------------------------------- |
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80 // Exception Controller constructor. |
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81 |
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82 Cyg_Exception_Control::Cyg_Exception_Control() |
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83 { |
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84 CYG_REPORT_FUNCTION(); |
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85 #ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE |
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86 |
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87 for( int i = 0; i < CYGNUM_HAL_EXCEPTION_COUNT ; i++ ) |
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88 exception_handler[i] = cyg_null_exception_handler, |
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89 exception_data[i] = 0; |
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90 #else |
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91 |
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92 exception_handler = cyg_null_exception_handler; |
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93 exception_data = 0; |
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94 |
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95 #endif |
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96 CYG_REPORT_RETURN(); |
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97 } |
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98 |
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99 // ------------------------------------------------------------------------- |
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100 // Exception registation. Stores the handler function and data to be used |
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101 // for handling the given exception number. Where exceptions are not decoded |
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102 // only a single handler may be registered for all exceptions. This function |
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103 // also returns the old values of the exception handler and data to allow |
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104 // chaining to be implemented. |
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105 |
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106 void |
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107 Cyg_Exception_Control::register_exception( |
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108 cyg_code exception_number, // exception number |
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109 cyg_exception_handler handler, // handler function |
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110 CYG_ADDRWORD data, // data argument |
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111 cyg_exception_handler **old_handler, // handler function |
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112 CYG_ADDRWORD *old_data // data argument |
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113 ) |
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114 { |
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115 CYG_REPORT_FUNCTION(); |
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116 CYG_REPORT_FUNCARG5("exception=%d, handler func=%08x, data=%08x, " |
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117 "space for old handler=%08x,space for old data=%08x", |
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118 exception_number, handler, data, old_handler, |
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119 old_data); |
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120 |
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121 CYG_ASSERT( exception_number <= CYGNUM_HAL_EXCEPTION_MAX, |
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122 "Out of range exception number"); |
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123 CYG_ASSERT( exception_number >= CYGNUM_HAL_EXCEPTION_MIN, |
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124 "Out of range exception number"); |
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125 |
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126 |
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127 // Should we complain if there is already a registered |
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128 // handler, or should we just replace is silently? |
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129 |
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130 #ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE |
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131 |
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132 if( old_handler != NULL ) |
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133 *old_handler = exception_handler[exception_number - |
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134 CYGNUM_HAL_EXCEPTION_MIN]; |
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135 if( old_data != NULL ) |
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136 *old_data = exception_data[exception_number - |
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137 CYGNUM_HAL_EXCEPTION_MIN]; |
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138 exception_handler[exception_number - CYGNUM_HAL_EXCEPTION_MIN] = handler; |
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139 exception_data[exception_number - CYGNUM_HAL_EXCEPTION_MIN] = data; |
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140 |
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141 #else |
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142 |
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143 if( old_handler != NULL ) |
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144 *old_handler = exception_handler; |
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145 if( old_data != NULL ) |
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146 *old_data = exception_data; |
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147 exception_handler = handler; |
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148 exception_data = data; |
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149 |
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150 #endif |
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151 CYG_REPORT_RETURN(); |
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152 } |
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153 |
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154 // ------------------------------------------------------------------------- |
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155 // Exception deregistation. Revert the handler for the exception number |
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156 // to the default. |
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157 |
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158 void |
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159 Cyg_Exception_Control::deregister_exception( |
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160 cyg_code exception_number // exception number |
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161 ) |
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162 { |
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163 CYG_REPORT_FUNCTION(); |
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164 CYG_REPORT_FUNCARG1("exception number=%d", exception_number); |
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165 |
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166 CYG_ASSERT( exception_number <= CYGNUM_HAL_EXCEPTION_MAX, |
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167 "Out of range exception number"); |
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168 CYG_ASSERT( exception_number >= CYGNUM_HAL_EXCEPTION_MIN, |
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169 "Out of range exception number"); |
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170 |
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171 #ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE |
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172 |
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173 exception_handler[exception_number - CYGNUM_HAL_EXCEPTION_MIN] = |
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174 cyg_null_exception_handler; |
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175 exception_data[exception_number - CYGNUM_HAL_EXCEPTION_MIN] = 0; |
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176 |
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177 #else |
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178 |
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179 exception_handler = cyg_null_exception_handler; |
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180 exception_data = 0; |
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181 |
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182 #endif |
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183 |
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184 CYG_REPORT_RETURN(); |
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185 } |
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186 |
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187 // ------------------------------------------------------------------------- |
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188 // Exception delivery. Call the appropriate exception handler. |
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189 |
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190 void |
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191 Cyg_Exception_Control::deliver_exception( |
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192 cyg_code exception_number, // exception being raised |
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193 CYG_ADDRWORD exception_info // exception specific info |
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194 ) |
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195 { |
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196 CYG_REPORT_FUNCTION(); |
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197 CYG_REPORT_FUNCARG2("exception number=%d, exception info=%08x", |
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198 exception_number, exception_info); |
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199 |
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200 cyg_exception_handler *handler = NULL; |
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201 CYG_ADDRWORD data = 0; |
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202 |
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203 CYG_ASSERT( exception_number <= CYGNUM_HAL_EXCEPTION_MAX, |
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204 "Out of range exception number"); |
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205 CYG_ASSERT( exception_number >= CYGNUM_HAL_EXCEPTION_MIN, |
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206 "Out of range exception number"); |
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207 |
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208 #ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE |
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209 |
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210 handler = exception_handler[exception_number - CYGNUM_HAL_EXCEPTION_MIN]; |
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211 data = exception_data[exception_number - CYGNUM_HAL_EXCEPTION_MIN]; |
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212 |
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213 #else |
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214 |
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215 handler = exception_handler; |
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216 data = exception_data; |
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217 |
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218 #endif |
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219 |
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220 // The handler will always be a callable function: either the user's |
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221 // registered function or the null handler. So it is always safe to |
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222 // just go ahead and call it. |
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223 |
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224 handler( data, exception_number, exception_info ); |
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225 |
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226 CYG_REPORT_RETURN(); |
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227 } |
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228 |
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229 // ------------------------------------------------------------------------- |
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230 // Exception delivery function called from the HAL as a result of a |
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231 // hardware exception being raised. |
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232 |
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233 externC void |
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234 cyg_hal_deliver_exception( CYG_WORD code, CYG_ADDRWORD data ) |
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235 { |
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236 CYG_REPORT_FUNCTION(); |
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237 Cyg_Thread::self()->deliver_exception( (cyg_code)code, data ); |
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238 CYG_REPORT_RETURN(); |
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239 } |
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240 |
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241 // ------------------------------------------------------------------------- |
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242 // Where exceptions are global, there is a single static instance of the |
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243 // exception control object. Define it here. |
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244 |
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245 #ifdef CYGSEM_KERNEL_EXCEPTIONS_GLOBAL |
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246 |
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247 Cyg_Exception_Control Cyg_Thread::exception_control |
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248 CYG_INIT_PRIORITY(INTERRUPTS); |
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249 |
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250 #endif |
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251 |
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252 // ------------------------------------------------------------------------- |
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253 |
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254 #endif // ifdef CYGPKG_KERNEL_EXCEPTIONS |
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255 |
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256 // ------------------------------------------------------------------------- |
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257 // EOF common/except.cxx |
