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1 #ifndef CYGONCE_KERNEL_EXCEPT_HXX |
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2 #define CYGONCE_KERNEL_EXCEPT_HXX |
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3 |
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4 //========================================================================== |
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5 // |
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6 // except.hxx |
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7 // |
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8 // Exception handling declarations |
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9 // |
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10 //========================================================================== |
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11 //####COPYRIGHTBEGIN#### |
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12 // |
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13 // ------------------------------------------- |
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14 // The contents of this file are subject to the Cygnus eCos Public License |
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15 // Version 1.0 (the "License"); you may not use this file except in |
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16 // compliance with the License. You may obtain a copy of the License at |
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17 // http://sourceware.cygnus.com/ecos |
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18 // |
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19 // Software distributed under the License is distributed on an "AS IS" |
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20 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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21 // License for the specific language governing rights and limitations under |
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22 // the License. |
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23 // |
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24 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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25 // September 30, 1998. |
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26 // |
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27 // The Initial Developer of the Original Code is Cygnus. Portions created |
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28 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. |
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29 // ------------------------------------------- |
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30 // |
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31 //####COPYRIGHTEND#### |
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32 //========================================================================== |
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33 //#####DESCRIPTIONBEGIN#### |
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34 // |
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35 // Author(s): nickg |
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36 // Contributors: nickg, jlarmour |
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37 // Date: 1999-02-16 |
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38 // Purpose: Define exception interfaces |
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39 // Description: The classes defined here collectively implement the |
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40 // internal API used to register, manage and deliver |
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41 // exceptions. |
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42 // Usage: #include <cyg/kernel/thread.hxx> |
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43 // |
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44 //####DESCRIPTIONEND#### |
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45 // |
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46 //========================================================================== |
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47 |
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48 #include <cyg/kernel/ktypes.h> |
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49 #include <cyg/infra/cyg_ass.h> // assertion macros |
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50 #include <cyg/hal/hal_intr.h> // exception defines |
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51 |
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52 // ------------------------------------------------------------------------- |
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53 // Exception handler function prototype |
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54 |
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55 typedef void cyg_exception_handler( |
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56 CYG_ADDRWORD data, // user supplied data |
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57 cyg_code exception_number, // exception being raised |
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58 CYG_ADDRWORD exception_info // any exception specific info |
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59 ); |
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60 |
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61 // ------------------------------------------------------------------------- |
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62 // Exception delivery interface. This function is exported to the HAL which |
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63 // invokes it for all exceptions that it is not able to handle itself. |
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64 |
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65 externC void cyg_hal_deliver_exception( CYG_WORD code, CYG_ADDRWORD data ); |
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66 |
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67 // ------------------------------------------------------------------------- |
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68 // Exception control class. Depending on the configuration there is either |
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69 // one of these per thread, or one for the entire system. |
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70 |
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71 #ifdef CYGPKG_KERNEL_EXCEPTIONS |
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72 |
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73 class Cyg_Exception_Control |
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74 { |
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75 |
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76 #ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE |
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77 cyg_exception_handler *exception_handler[CYGNUM_HAL_EXCEPTION_COUNT]; |
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78 |
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79 CYG_ADDRWORD exception_data[CYGNUM_HAL_EXCEPTION_COUNT]; |
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80 #else |
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81 cyg_exception_handler *exception_handler; // Handler function |
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82 |
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83 CYG_ADDRWORD exception_data; // Handler data |
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84 #endif |
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85 |
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86 public: |
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87 |
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88 Cyg_Exception_Control(); |
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89 |
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90 // Register an exception handler for either the specific exception |
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91 // or for all exceptions. |
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92 void register_exception( |
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93 cyg_code exception_number, // exception number |
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94 cyg_exception_handler handler, // handler function |
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95 CYG_ADDRWORD data, // data argument |
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96 cyg_exception_handler **old_handler, // handler function |
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97 CYG_ADDRWORD *old_data // data argument |
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98 ); |
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99 |
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100 // Remove an exception handler. |
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101 void deregister_exception( |
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102 cyg_code exception_number // exception number |
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103 ); |
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104 |
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105 // Deliver the given exception now by invoking the appropriate |
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106 // exception handler. |
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107 void deliver_exception( |
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108 cyg_code exception_number, // exception being raised |
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109 CYG_ADDRWORD exception_info // exception specific info |
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110 ); |
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111 }; |
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112 |
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113 #endif |
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114 |
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115 // ------------------------------------------------------------------------- |
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116 #endif // ifndef CYGONCE_KERNEL_EXCEPT_HXX |
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117 // EOF except.hxx |
