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annotate packages/language/c/libc/signals/current/src/siginit.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children e0c0827131d1
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1 //========================================================================
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2 //
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3 // siginit.cxx
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4 //
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5 // ISO C and POSIX 1003.1 signals 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 Red Hat eCos Public License
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12 // Version 1.1 (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://www.redhat.com/
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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 Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
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35 // Contributors:
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36 // Date: 2000-04-18
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37 // Purpose: Provide implementation of ISO C and POSIX 1003.1 signals
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38 // Description: This file initializes all hardware exceptions,
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39 // initializes the signal handler table and provides the
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40 // default action function for signals
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41 // Usage:
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42 //
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43 //####DESCRIPTIONEND####
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44 //
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45 //========================================================================
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46
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47 // CONFIGURATION
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48
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49 #include <pkgconf/libc_signals.h> // libc signals configuration
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50
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51 // INCLUDES
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52
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53 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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54 #include <signal.h> // Main signals definitions
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55 #include <cyg/infra/cyg_ass.h> // Assertion infrastructure
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56 #include <cyg/infra/cyg_trac.h> // Tracing infrastructure
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57 #include <stdlib.h> // exit()
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58
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59 #ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS
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60 # include <pkgconf/kernel.h> // required for kernel includes
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61 # include <cyg/kernel/except.hxx> // Kernel exception API
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62 # include <cyg/kernel/thread.hxx> // Cyg_Thread::self()
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63 # include <cyg/kernel/thread.inl> // inline definitions for above
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64 # include <cyg/kernel/intr.hxx> // Interrupt enable
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65 # include <cyg/hal/hal_intr.h> // HAL interrupt control
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66 #endif
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67
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68 #ifdef CYGSEM_LIBC_SIGNALS_THREAD_SAFE
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69 # include <pkgconf/kernel.h> // required for kernel includes
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70 # include <cyg/kernel/mutex.hxx>
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71 #endif
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72
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73 // TYPE DEFINITIONS
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74
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75 // define dummy class to allow initialization of cyg_libc_signal_handlers
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76
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77 class Cyg_libc_signals_dummy_init_class {
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78 public:
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79 Cyg_libc_signals_dummy_init_class();
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80 };
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81
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82 #ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS
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83
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84 struct exception_signal_mapping_t {
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85 cyg_code exception;
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86 int signal;
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87 };
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88
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89 // EXTERNS
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90
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91 extern cyg_exception_handler cyg_null_exception_handler;
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92
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93 #endif // ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS
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94
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95 // GLOBALS
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96
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97 // main signal handlers
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98 __sighandler_t cyg_libc_signal_handlers[CYGNUM_LIBC_SIGNALS];
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99
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100 #ifdef CYGSEM_LIBC_SIGNALS_THREAD_SAFE
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101 Cyg_Mutex cyg_libc_signal_handlers_mutex CYG_INIT_PRIORITY(LIBC);
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102 #endif
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103
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104 // STATICS
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105
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106 // dummy object to invoke constructor
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107 static Cyg_libc_signals_dummy_init_class
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108 cyg_libc_signals_dummy_init_obj CYG_INIT_PRIORITY(LIBC);
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109
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110 #ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS
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111
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112 # ifdef CYGDBG_USE_TRACING
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113 static cyg_uint8 cyg_libc_signals_hwhandler_trace_level =
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114 CYGNUM_LIBC_SIGNALS_HWHANDLER_TRACE_LEVEL;
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115 # define TL1 (0 < cyg_libc_signals_hwhandler_trace_level)
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116 # endif
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117
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118 # ifdef CYGSEM_LIBC_SIGNALS_CHAIN_HWEXCEPTIONS
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119 // old exception info so we can chain
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120 // FIXME: consider malloced linked list config option
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121 static struct {
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122 cyg_exception_handler *old_handler;
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123 CYG_ADDRWORD old_data;
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124 } exception_chain_data[CYGNUM_HAL_EXCEPTION_COUNT];
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125 # endif
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126
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127 // struct that maps exceptions to signals
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128 static const struct exception_signal_mapping_t
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129 exception_signal_mapping[] = {
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130
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131 #ifdef CYGNUM_HAL_EXCEPTION_DATA_ACCESS
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132 {CYGNUM_HAL_EXCEPTION_DATA_ACCESS, SIGBUS},
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133 #endif
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134 #ifdef CYGNUM_HAL_EXCEPTION_DATA_WRITE
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135 {CYGNUM_HAL_EXCEPTION_DATA_WRITE, SIGBUS},
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136 #endif
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137 #ifdef CYGNUM_HAL_EXCEPTION_CODE_ACCESS
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138 {CYGNUM_HAL_EXCEPTION_CODE_ACCESS, SIGBUS},
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139 #endif
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140 #ifdef CYGNUM_HAL_EXCEPTION_CODE_WRITE
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141 {CYGNUM_HAL_EXCEPTION_CODE_WRITE, SIGBUS},
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142 #endif
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143 #ifdef CYGNUM_HAL_EXCEPTION_CODE_EXECUTE
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144 {CYGNUM_HAL_EXCEPTION_CODE_EXECUTE, SIGBUS},
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145 #endif
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146 #ifdef CYGNUM_HAL_EXCEPTION_IO_ACCESS
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147 {CYGNUM_HAL_EXCEPTION_IO_ACCESS, SIGBUS},
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148 #endif
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149 #ifdef CYGNUM_HAL_EXCEPTION_IO_WRITE
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150 {CYGNUM_HAL_EXCEPTION_IO_ACCESS, SIGBUS},
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151 #endif
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152 #ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_ACCESS
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153 {CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_ACCESS, SIGSEGV},
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154 #endif
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155 #ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_WRITE
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156 {CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_WRITE, SIGSEGV},
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157 #endif
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158 #ifdef CYGNUM_HAL_EXCEPTION_CODE_TLBMISS_ACCESS
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159 {CYGNUM_HAL_EXCEPTION_CODE_TLBMISS_ACCESS, SIGSEGV},
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160 #endif
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161 #ifdef CYGNUM_HAL_EXCEPTION_CODE_TLBMISS_WRITE
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162 {CYGNUM_HAL_EXCEPTION_CODE_TLBMISS_WRITE, SIGSEGV},
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163 #endif
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164 #ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBERROR_ACCESS
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165 {CYGNUM_HAL_EXCEPTION_DATA_TLBERROR_ACCESS, SIGSEGV},
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166 #endif
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167 #ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBERROR_WRITE
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168 {CYGNUM_HAL_EXCEPTION_DATA_TLBERROR_WRITE, SIGSEGV},
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169 #endif
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170 #ifdef CYGNUM_HAL_EXCEPTION_CODE_TLBERROR_ACCESS
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171 {CYGNUM_HAL_EXCEPTION_CODE_TLBERROR_ACCESS, SIGSEGV},
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172 #endif
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173 #ifdef CYGNUM_HAL_EXCEPTION_CODE_TLBERROR_WRITE
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174 {CYGNUM_HAL_EXCEPTION_CODE_TLBERROR_WRITE, SIGSEGV},
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175 #endif
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176 #ifdef CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_ACCESS
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177 {CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_ACCESS, SIGBUS},
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178 #endif
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179 #ifdef CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_WRITE
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180 {CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_WRITE, SIGBUS},
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181 #endif
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182 #ifdef CYGNUM_HAL_EXCEPTION_IO_UNALIGNED_ACCESS
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183 {CYGNUM_HAL_EXCEPTION_IO_UNALIGNED_ACCESS, SIGBUS},
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184 #endif
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185 #ifdef CYGNUM_HAL_EXCEPTION_IO_UNALIGNED_WRITE
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186 {CYGNUM_HAL_EXCEPTION_IO_UNALIGNED_WRITE, SIGBUS},
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187 #endif
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188 #ifdef CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION
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189 {CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION, SIGILL},
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190 #endif
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191 #ifdef CYGNUM_HAL_EXCEPTION_INTERRUPT
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192 {CYGNUM_HAL_EXCEPTION_INTERRUPT, SIGINT},
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193 #endif
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194 #ifdef CYGNUM_HAL_EXCEPTION_TRAP
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195 {CYGNUM_HAL_EXCEPTION_TRAP, SIGTRAP},
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196 #endif
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197 #ifdef CYGNUM_HAL_EXCEPTION_DIV_BY_ZERO
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198 {CYGNUM_HAL_EXCEPTION_DIV_BY_ZERO, SIGFPE},
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199 #endif
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200 #ifdef CYGNUM_HAL_EXCEPTION_OVERFLOW
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201 {CYGNUM_HAL_EXCEPTION_OVERFLOW, SIGFPE},
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202 #endif
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203 #ifdef CYGNUM_HAL_EXCEPTION_BOUNDS
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204 {CYGNUM_HAL_EXCEPTION_BOUNDS, SIGSEGV},
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205 #endif
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206 #ifdef CYGNUM_HAL_EXCEPTION_SINGLE_STEP
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207 {CYGNUM_HAL_EXCEPTION_SINGLE_STEP, SIGTRAP},
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208 #endif
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209 #ifdef CYGNUM_HAL_EXCEPTION_INSTRUCTION_BP
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210 {CYGNUM_HAL_EXCEPTION_INSTRUCTION_BP, SIGTRAP},
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211 #endif
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212 #ifdef CYGNUM_HAL_EXCEPTION_PERIPHERAL_BP
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213 {CYGNUM_HAL_EXCEPTION_PERIPHERAL_BP, SIGTRAP},
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214 #endif
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215 #ifdef CYGNUM_HAL_EXCEPTION_DATA_BP
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216 {CYGNUM_HAL_EXCEPTION_DATA_BP, SIGTRAP},
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217 #endif
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218 #ifdef CYGNUM_HAL_EXCEPTION_DEVELOPMENT_BP
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219 {CYGNUM_HAL_EXCEPTION_DEVELOPMENT_BP, SIGTRAP},
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220 #endif
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221 #ifdef CYGNUM_HAL_EXCEPTION_STACK_OVERFLOW
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222 {CYGNUM_HAL_EXCEPTION_STACK_OVERFLOW, SIGSEGV},
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223 #endif
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224 #ifdef CYGNUM_HAL_EXCEPTION_STACK_FAULT
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225 {CYGNUM_HAL_EXCEPTION_STACK_FAULT, SIGSEGV},
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226 #endif
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227 #ifdef CYGNUM_HAL_EXCEPTION_PARITY
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228 {CYGNUM_HAL_EXCEPTION_PARITY, SIGBUS},
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229 #endif
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230 #ifdef CYGNUM_HAL_EXCEPTION_FPU
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231 {CYGNUM_HAL_EXCEPTION_FPU, SIGFPE},
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232 #endif
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233 #ifdef CYGNUM_HAL_EXCEPTION_FPU_NOT_AVAIL
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234 {CYGNUM_HAL_EXCEPTION_FPU_NOT_AVAIL, SIGFPE},
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235 #endif
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236 #ifdef CYGNUM_HAL_EXCEPTION_FPU_OVERFLOW
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237 {CYGNUM_HAL_EXCEPTION_FPU_OVERFLOW, SIGFPE},
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238 #endif
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239 #ifdef CYGNUM_HAL_EXCEPTION_FPU_UNDERFLOW
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240 {CYGNUM_HAL_EXCEPTION_FPU_UNDERFLOW, SIGFPE},
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241 #endif
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242 #ifdef CYGNUM_HAL_EXCEPTION_FPU_DIV_BY_ZERO
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243 {CYGNUM_HAL_EXCEPTION_FPU_DIV_BY_ZERO, SIGFPE},
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244 #endif
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245 #ifdef CYGNUM_HAL_EXCEPTION_SYSTEM_CALL
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246 {CYGNUM_HAL_EXCEPTION_SYSTEM_CALL, SIGSYS},
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247 #endif
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248 {0, 0} // dummy value to ensure compiler is happy
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249 };
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250
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251
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252 // FUNCTIONS
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253
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254 /////////////////////////////////////////
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255 // cyg_libc_signals_hwexcept_handler() //
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256 /////////////////////////////////////////
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257
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258 // FIXME: should be able to get this work with
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259 // CYGSEM_KERNEL_EXCEPTIONS_DECODE disabled as well as enabled
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260 static void
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261 cyg_libc_signals_hwexcept_handler( CYG_ADDRWORD data, cyg_code exception,
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262 CYG_ADDRWORD info)
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263 {
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264 int signal = (int)data;
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265 int ret;
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266
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267 CYG_REPORT_FUNCNAME("cyg_libc_signals_hwexcept_handler");
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268
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269 CYG_REPORT_FUNCARG3( "data = %08x, exception = %d, info = %08x",
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270 data, exception, info );
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271
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272 #ifdef CYGSEM_LIBC_SIGNALS_BAD_SIGNAL_FATAL
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273 CYG_PRECONDITION((signal > 0) && (signal < CYGNUM_LIBC_SIGNALS),
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274 "Signal number not valid!");
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275 #endif
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276
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277 // chain first as it may be more useful more low-level stuff needed
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278 #ifdef CYGSEM_LIBC_SIGNALS_CHAIN_HWEXCEPTIONS
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279 // map exception to 0..CYGNUM_HAL_EXCEPTION_COUNT
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280 exception -= CYGNUM_HAL_EXCEPTION_MIN;
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281
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282 // special case for null handler since it is only for uncaught exceptions
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283
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284 if (exception_chain_data[exception].old_handler !=
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285 cyg_null_exception_handler) {
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286 (*exception_chain_data[exception].old_handler)(
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287 exception_chain_data[exception].old_data, exception, info);
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288 CYG_TRACE0(TL1, "Chained exception handler returned");
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289 } // if
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290 #endif
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291
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292 #ifndef CYGSEM_LIBC_SIGNALS_BAD_SIGNAL_FATAL
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293 // if not fatal, silently return
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294 if ((signal <= 0) || (signal >= CYGNUM_LIBC_SIGNALS)) {
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295 CYG_REPORT_RETURN();
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296 return;
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297 }
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298 #endif
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299
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300 CYG_TRACE0(TL1, "Enabling interrupts");
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301 HAL_ENABLE_INTERRUPTS();
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302
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303 CYG_TRACE0(TL1, "Raising signal");
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304 ret = raise(signal);
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305
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306 if (ret) {
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307 CYG_TRACE1(TL1, "raise() returned non-zero value %d!!!", ret);
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308 } // if
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309
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310 CYG_REPORT_RETURN();
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311 } // cyg_libc_signals_hwexcept_handler()
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312
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313
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314 //////////////////
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315 // reg_except() //
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316 //////////////////
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317
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318 static void inline
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319 reg_except( cyg_code exception, int signal )
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320 {
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321 Cyg_Thread::self()->register_exception(
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322 exception, &cyg_libc_signals_hwexcept_handler, (CYG_ADDRWORD)signal,
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323 #ifdef CYGSEM_LIBC_SIGNALS_CHAIN_HWEXCEPTIONS
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324 &exception_chain_data[exception -
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325 CYGNUM_HAL_EXCEPTION_MIN].old_handler,
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326 &exception_chain_data[exception - CYGNUM_HAL_EXCEPTION_MIN].old_data
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327 #else
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328 NULL, NULL
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329 #endif
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330 );
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331
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332 } // reg_except();
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333
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334 #endif // ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS
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335
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336 ///////////////////////////////////////////////////
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337 // Cyg_libc_signals_dummy_init_class constructor //
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338 ///////////////////////////////////////////////////
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339
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340 Cyg_libc_signals_dummy_init_class::Cyg_libc_signals_dummy_init_class()
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341 {
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342 cyg_ucount8 i;
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343
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344 CYG_REPORT_FUNCNAME("Cyg_libc_signals_dummy_init_class constructor");
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345
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346 // FIXME: some should be SIG_IGN?
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347 for (i=0; i<CYGNUM_LIBC_SIGNALS; i++)
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348 cyg_libc_signal_handlers[i] = SIG_DFL;
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349
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350 #ifdef CYGSEM_LIBC_SIGNALS_HWEXCEPTIONS
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351 // go through the entire array of exceptions, _but_ subtract 1 for
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352 // the dummy at the end
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353 for (i=0; i < (sizeof(exception_signal_mapping) /
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354 sizeof(exception_signal_mapping_t) - 1); i++) {
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355 CYG_ASSERT( (exception_signal_mapping[i].exception <=
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356 CYGNUM_HAL_EXCEPTION_MAX) &&
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357 (exception_signal_mapping[i].exception >=
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358 CYGNUM_HAL_EXCEPTION_MIN),
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359 "Asked to register bad exception");
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360
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361 CYG_ASSERT( (exception_signal_mapping[i].signal > 0) &&
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362 (exception_signal_mapping[i].signal <
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363 CYGNUM_LIBC_SIGNALS), "Asked to register bad signal" );
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364
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365 reg_except( exception_signal_mapping[i].exception,
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366 exception_signal_mapping[i].signal);
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367 }
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368 #endif
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369
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370 CYG_REPORT_RETURN();
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371 } // Cyg_libc_signals_dummy_init_class() constructor
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372
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373
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374 ////////////////////////////////////////
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375 // cyg_libc_signals_default_handler() //
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376 ////////////////////////////////////////
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377
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378 // Default signal handler - SIG_DFL
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379 externC void
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380 cyg_libc_signals_default_handler(int sig)
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381 {
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382 CYG_REPORT_FUNCNAME( "cyg_libc_signals_default_handler" );
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383
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384 CYG_REPORT_FUNCARG1( "signal number = %d", sig );
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385
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386 exit(1000 + sig); // FIXME
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387
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388 CYG_REPORT_RETURN();
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389 } // cyg_libc_signals_default_handler()
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390
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391 #ifdef CYGSEM_LIBC_SIGNALS_THREAD_SAFE
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392 /////////////////////////////////////
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393 // cyg_libc_signals_lock_do_lock() //
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394 /////////////////////////////////////
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395
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396 externC cyg_bool
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397 cyg_libc_signals_lock_do_lock(void)
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398 {
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399 cyg_bool ret;
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400 CYG_REPORT_FUNCNAMETYPE("cyg_libc_signals_lock_do_lock", "returning %d");
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401
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402 ret = cyg_libc_signal_handlers_mutex.lock();
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403
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404 CYG_REPORT_RETVAL(ret);
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405
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406 return ret;
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407 } // cyg_libc_signals_lock_do_lock()
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408
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409 ///////////////////////////////////////
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410 // cyg_libc_signals_lock_do_unlock() //
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411 ///////////////////////////////////////
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412
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413 externC void
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414 cyg_libc_signals_lock_do_unlock(void)
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415 {
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416 CYG_REPORT_FUNCNAME("cyg_libc_signals_lock_do_unlock");
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417
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418 cyg_libc_signal_handlers_mutex.unlock();
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419
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420 CYG_REPORT_RETURN();
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421 } // cyg_libc_signals_lock_do_unlock()
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422
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423 #endif // ifdef CYGSEM_LIBC_SIGNALS_THREAD_SAFE
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424
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425 // EOF siginit.cxx