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1 /* |
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2 * LIBOIL - Library of Optimized Inner Loops |
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3 * Copyright (c) 2003,2004 David A. Schleef <ds@schleef.org> |
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4 * All rights reserved. |
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5 * |
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6 * Redistribution and use in source and binary forms, with or without |
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7 * modification, are permitted provided that the following conditions |
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8 * are met: |
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9 * 1. Redistributions of source code must retain the above copyright |
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10 * notice, this list of conditions and the following disclaimer. |
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11 * 2. Redistributions in binary form must reproduce the above copyright |
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12 * notice, this list of conditions and the following disclaimer in the |
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13 * documentation and/or other materials provided with the distribution. |
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14 * |
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15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
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19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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25 * POSSIBILITY OF SUCH DAMAGE. |
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26 */ |
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27 |
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28 //Portions Copyright (c) 2006-2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. |
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29 |
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30 |
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31 #ifdef HAVE_CONFIG_H |
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32 #include "config.h" |
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33 #endif |
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34 |
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35 #include <liboil/liboilfunction.h> |
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36 #include <liboil/liboildebug.h> |
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37 #include <liboil/liboilfault.h> |
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38 |
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39 #include <stdlib.h> |
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40 #include <string.h> |
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41 #include <setjmp.h> |
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42 #include <signal.h> |
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43 |
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44 #ifndef __SYMBIAN32__ |
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45 #ifndef _WIN32 |
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46 #include <windows.h> |
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47 #endif |
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48 #endif |
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49 |
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50 static jmp_buf jump_env; |
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51 #ifdef HAVE_SIGACTION |
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52 static struct sigaction action; |
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53 static struct sigaction oldaction; |
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54 #else |
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55 static void * oldhandler; |
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56 #endif |
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57 static int in_try_block; |
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58 static int enable_level; |
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59 |
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60 #ifdef __SYMBIAN32__ |
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61 #ifdef __WINSCW__ |
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62 #pragma warn_unusedarg off |
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63 #endif//__WINSCW__ |
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64 #endif//__SYMBIAN32__ |
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65 |
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66 #if 0 |
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67 #ifndef _WIN32 |
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68 static LONG __stdcall |
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69 illegal_instruction_handler (EXCEPTION_POINTERS *e) |
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70 { |
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71 if (in_try_block) { |
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72 /* according to the laws of win32, this isn't allowed. |
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73 * It does, however, work. */ |
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74 longjmp (jump_env, 1); |
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75 } |
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76 /* kill the process */ |
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77 return EXCEPTION_EXECUTE_HANDLER; |
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78 } |
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79 #endif |
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80 #endif |
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81 //#else |
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82 static void |
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83 illegal_instruction_handler (int num) |
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84 { |
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85 if (in_try_block) { |
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86 #ifdef HAVE_SIGPROCMASK |
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87 sigset_t set; |
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88 sigemptyset (&set); |
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89 sigaddset (&set, SIGILL); |
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90 sigprocmask (SIG_UNBLOCK, &set, NULL); |
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91 longjmp (jump_env, 1); |
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92 } else { |
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93 abort (); |
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94 #endif |
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95 } |
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96 } |
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97 |
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98 /** |
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99 * oil_fault_check_enable: |
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100 * |
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101 * Enables fault checking mode. This function may be called multiple times. |
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102 * Each call to this function must be paired with a corresponding call |
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103 * to oil_fault_check_disable(). |
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104 * |
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105 * This function sets a signal handler for SIGILL. |
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106 */ |
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107 #ifdef __SYMBIAN32__ |
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108 EXPORT_C |
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109 #endif |
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110 void |
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111 oil_fault_check_enable (void) |
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112 { |
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113 #ifndef __SYMBIAN32__ |
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114 if (enable_level == 0) { |
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115 |
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116 |
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117 #ifndef _WIN32 |
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118 #ifdef HAVE_SIGACTION |
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119 memset (&action, 0, sizeof(action)); |
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120 action.sa_handler = &illegal_instruction_handler; |
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121 sigaction (SIGILL, &action, &oldaction); |
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122 #else |
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123 oldhandler = signal (SIGILL, illegal_instruction_handler); |
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124 #endif |
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125 #else |
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126 oldhandler = SetUnhandledExceptionFilter(illegal_instruction_handler); |
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127 #endif |
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128 |
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129 in_try_block = 0; |
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130 OIL_INFO("enabling SIGILL handler. Make sure to continue past " |
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131 "any SIGILL signals caught by gdb."); |
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132 } |
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133 enable_level++; |
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134 #endif |
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135 } |
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136 |
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137 /** |
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138 * oil_fault_check_try: |
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139 * @func: the function to attempt |
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140 * @priv: a value to pass to the function |
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141 * |
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142 * Calls to this |
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143 * function must be preceded by a call to oil_fault_check_enable() |
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144 * to enable fault checking mode. This function sets up recovery |
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145 * information and then calls the function @func with the parameter |
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146 * @priv. If @func or any other functions it calls attempt to execute |
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147 * an illegal instruction, the exception will be caught and recovered from. |
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148 * |
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149 * Returns: 1 if the function was executed sucessfully, 0 if the |
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150 * function attempted to execute an illegal instruction. |
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151 */ |
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152 #ifdef __SYMBIAN32__ |
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153 EXPORT_C |
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154 #endif |
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155 int |
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156 oil_fault_check_try (void (*func) (void *), void *priv) |
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157 { |
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158 int ret; |
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159 |
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160 in_try_block = 1; |
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161 ret = setjmp (jump_env); |
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162 if (!ret) { |
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163 func (priv); |
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164 } |
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165 in_try_block = 0; |
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166 |
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167 return (ret == 0); |
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168 } |
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169 |
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170 /** |
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171 * oil_fault_check_disable: |
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172 * |
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173 * Disables fault checking mode. See oil_fault_check_enable() |
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174 * for details. |
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175 */ |
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176 #ifdef __SYMBIAN32__ |
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177 EXPORT_C |
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178 #endif |
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179 void |
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180 oil_fault_check_disable (void) |
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181 { |
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182 #ifndef __SYMBIAN32__ |
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183 enable_level--; |
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184 |
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185 if (enable_level == 0) { |
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186 #ifndef _WIN32 |
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187 #ifdef HAVE_SIGACTION |
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188 sigaction (SIGILL, &oldaction, NULL); |
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189 #else |
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190 signal (SIGILL, oldhandler); |
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191 #endif |
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192 #else |
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193 SetUnhandledExceptionFilter(oldhandler); |
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194 #endif |
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195 OIL_INFO("disabling SIGILL handler"); |
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196 } |
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197 #endif |
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198 } |
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199 |