1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // interpose.c -- |
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8 | // |
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9 | // Author : Thierry Delisle |
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10 | // Created On : Wed Mar 29 16:10:31 2017 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Fri Mar 13 17:35:37 2020 |
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13 | // Update Count : 178 |
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14 | // |
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15 | |
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16 | #include <stdarg.h> // va_start, va_end |
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17 | #include <stdio.h> |
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18 | #include <string.h> // strlen |
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19 | #include <unistd.h> // _exit, getpid |
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20 | #define __USE_GNU |
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21 | #include <signal.h> |
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22 | #undef __USE_GNU |
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23 | extern "C" { |
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24 | #include <dlfcn.h> // dlopen, dlsym |
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25 | #include <execinfo.h> // backtrace, messages |
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26 | } |
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27 | |
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28 | #include "bits/debug.hfa" |
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29 | #include "bits/defs.hfa" |
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30 | #include "bits/signal.hfa" // sigHandler_? |
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31 | #include "startup.hfa" // STARTUP_PRIORITY_CORE |
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32 | #include <assert.h> |
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33 | |
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34 | //============================================================================================= |
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35 | // Interposing helpers |
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36 | //============================================================================================= |
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37 | |
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38 | static void preload_libgcc(void) { |
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39 | dlopen( "libgcc_s.so.1", RTLD_NOW ); |
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40 | if ( const char * error = dlerror() ) abort( "interpose_symbol : internal error pre-loading libgcc, %s\n", error ); |
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41 | } |
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42 | |
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43 | typedef void (* generic_fptr_t)(void); |
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44 | static generic_fptr_t interpose_symbol( const char symbol[], const char version[] ) { |
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45 | const char * error; |
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46 | |
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47 | static void * library; |
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48 | static void * pthread_library; |
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49 | if ( ! library ) { |
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50 | #if defined( RTLD_NEXT ) |
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51 | library = RTLD_NEXT; |
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52 | #else |
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53 | // missing RTLD_NEXT => must hard-code library name, assuming libstdc++ |
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54 | library = dlopen( "libc.so.6", RTLD_LAZY ); |
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55 | error = dlerror(); |
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56 | if ( error ) { |
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57 | abort( "interpose_symbol : failed to open libc, %s\n", error ); |
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58 | } |
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59 | #endif |
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60 | } // if |
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61 | if ( ! pthread_library ) { |
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62 | #if defined( RTLD_NEXT ) |
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63 | pthread_library = RTLD_NEXT; |
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64 | #else |
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65 | // missing RTLD_NEXT => must hard-code library name, assuming libstdc++ |
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66 | pthread_library = dlopen( "libpthread.so", RTLD_LAZY ); |
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67 | error = dlerror(); |
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68 | if ( error ) { |
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69 | abort( "interpose_symbol : failed to open libpthread, %s\n", error ); |
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70 | } |
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71 | #endif |
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72 | } // if |
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73 | |
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74 | union { generic_fptr_t fptr; void * ptr; } originalFunc; |
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75 | |
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76 | #if defined( _GNU_SOURCE ) |
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77 | if ( version ) { |
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78 | originalFunc.ptr = dlvsym( library, symbol, version ); |
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79 | } else { |
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80 | originalFunc.ptr = dlsym( library, symbol ); |
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81 | } |
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82 | #else |
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83 | originalFunc.ptr = dlsym( library, symbol ); |
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84 | #endif // _GNU_SOURCE |
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85 | |
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86 | error = dlerror(); |
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87 | if ( error ) { |
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88 | originalFunc.ptr = dlsym( pthread_library, symbol ); |
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89 | error = dlerror(); |
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90 | if (error){ |
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91 | abort( "interpose_symbol : internal error, %s\n", error ); |
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92 | } // if |
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93 | } // if |
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94 | |
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95 | return originalFunc.fptr; |
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96 | } |
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97 | |
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98 | #define INTERPOSE_LIBC( x, ver ) __cabi_libc.x = (typeof(__cabi_libc.x))interpose_symbol( #x, ver ) |
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99 | |
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100 | //============================================================================================= |
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101 | // Interposition Startup logic |
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102 | //============================================================================================= |
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103 | |
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104 | static void sigHandler_segv( __CFA_SIGPARMS__ ); |
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105 | static void sigHandler_ill ( __CFA_SIGPARMS__ ); |
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106 | static void sigHandler_fpe ( __CFA_SIGPARMS__ ); |
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107 | static void sigHandler_abrt( __CFA_SIGPARMS__ ); |
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108 | static void sigHandler_term( __CFA_SIGPARMS__ ); |
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109 | |
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110 | static struct { |
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111 | void (* exit)( int ) __attribute__(( __noreturn__ )); |
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112 | void (* abort)( void ) __attribute__(( __noreturn__ )); |
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113 | typeof(pthread_create) pthread_create; |
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114 | typeof(pthread_join) pthread_join; |
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115 | typeof(pthread_self) pthread_self; |
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116 | typeof(pthread_cond_init) pthread_cond_init; |
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117 | typeof(pthread_cond_destroy) pthread_cond_destroy; |
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118 | typeof(pthread_cond_signal) pthread_cond_signal; |
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119 | typeof(pthread_cond_broadcast) pthread_cond_broadcast; |
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120 | typeof(pthread_cond_wait) pthread_cond_wait; |
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121 | typeof(pthread_mutex_init) pthread_mutex_init; |
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122 | typeof(pthread_mutex_lock) pthread_mutex_lock; |
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123 | typeof(pthread_mutex_trylock) pthread_mutex_trylock; |
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124 | typeof(pthread_mutex_unlock) pthread_mutex_unlock; |
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125 | typeof(pthread_mutex_destroy) pthread_mutex_destroy; |
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126 | typeof(pthread_attr_init ) pthread_attr_init; |
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127 | typeof(pthread_attr_setstack ) pthread_attr_setstack; |
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128 | typeof(pthread_attr_destroy) pthread_attr_destroy; |
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129 | typeof(pthread_attr_getstacksize) pthread_attr_getstacksize; |
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130 | } __cabi_libc; |
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131 | |
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132 | libcfa_public int cfa_main_returned; |
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133 | |
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134 | extern "C" { |
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135 | void __cfaabi_interpose_startup( void ) { |
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136 | const char *version = 0p; |
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137 | cfa_main_returned = 0; |
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138 | |
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139 | preload_libgcc(); |
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140 | |
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141 | #pragma GCC diagnostic push |
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142 | #pragma GCC diagnostic ignored "-Wdiscarded-qualifiers" |
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143 | INTERPOSE_LIBC( abort, version ); |
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144 | INTERPOSE_LIBC( exit , version ); |
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145 | INTERPOSE_LIBC( pthread_create , version ); |
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146 | INTERPOSE_LIBC( pthread_join , version ); |
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147 | INTERPOSE_LIBC( pthread_self , version ); |
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148 | INTERPOSE_LIBC( pthread_mutex_init , version ); |
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149 | INTERPOSE_LIBC( pthread_mutex_lock , version ); |
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150 | INTERPOSE_LIBC( pthread_mutex_unlock , version ); |
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151 | INTERPOSE_LIBC( pthread_mutex_destroy , version ); |
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152 | INTERPOSE_LIBC( pthread_cond_init , version ); |
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153 | INTERPOSE_LIBC( pthread_cond_destroy , version ); |
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154 | INTERPOSE_LIBC( pthread_cond_signal , version ); |
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155 | INTERPOSE_LIBC( pthread_cond_broadcast , version ); |
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156 | INTERPOSE_LIBC( pthread_cond_wait , version ); |
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157 | INTERPOSE_LIBC( pthread_attr_init , version ); |
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158 | INTERPOSE_LIBC( pthread_attr_destroy , version ); |
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159 | INTERPOSE_LIBC( pthread_attr_setstack , version ); |
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160 | INTERPOSE_LIBC( pthread_attr_getstacksize , version ); |
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161 | #pragma GCC diagnostic pop |
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162 | |
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163 | // As a precaution (and necessity), errors that result in termination are delivered on a separate stack because |
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164 | // task stacks might be very small (4K) and the signal delivery corrupts memory to the point that a clean |
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165 | // shutdown is impossible. Also, when a stack overflow encounters the non-accessible sentinel page (debug only) |
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166 | // and generates a segment fault, the signal cannot be delivered on the sentinel page. Finally, calls to abort |
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167 | // print a stack trace that uses substantial stack space. |
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168 | |
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169 | #define MINSTKSZ SIGSTKSZ * 8 |
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170 | static char stack[MINSTKSZ] __attribute__(( aligned (16) )); |
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171 | static stack_t ss; |
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172 | |
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173 | ss.ss_sp = stack; |
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174 | ss.ss_size = MINSTKSZ; |
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175 | ss.ss_flags = 0; |
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176 | if ( sigaltstack( &ss, 0p ) == -1 ) { |
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177 | abort( "__cfaabi_interpose_startup : internal error, sigaltstack error(%d) %s.", errno, strerror( errno ) ); |
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178 | } // if |
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179 | |
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180 | // Failure handler |
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181 | // internal errors |
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182 | __cfaabi_sigaction( SIGSEGV, sigHandler_segv, SA_SIGINFO | SA_ONSTACK ); // Invalid memory reference (default: Core) |
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183 | __cfaabi_sigaction( SIGBUS , sigHandler_segv, SA_SIGINFO | SA_ONSTACK ); // Bus error, bad memory access (default: Core) |
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184 | __cfaabi_sigaction( SIGILL , sigHandler_ill , SA_SIGINFO | SA_ONSTACK ); // Illegal Instruction (default: Core) |
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185 | __cfaabi_sigaction( SIGFPE , sigHandler_fpe , SA_SIGINFO | SA_ONSTACK ); // Floating-point exception (default: Core) |
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186 | |
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187 | // handlers to outside errors |
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188 | // reset in-case they insist and send it over and over |
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189 | __cfaabi_sigaction( SIGTERM, sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Termination signal (default: Term) |
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190 | __cfaabi_sigaction( SIGINT , sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Interrupt from keyboard (default: Term) |
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191 | __cfaabi_sigaction( SIGHUP , sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Hangup detected on controlling terminal or death of controlling process (default: Term) |
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192 | __cfaabi_sigaction( SIGQUIT, sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Quit from keyboard (default: Core) |
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193 | __cfaabi_sigaction( SIGABRT, sigHandler_term, SA_SIGINFO | SA_ONSTACK | SA_RESETHAND ); // Abort signal from abort(3) (default: Core) |
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194 | } |
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195 | } |
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196 | |
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197 | //============================================================================================= |
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198 | // Terminating Signals logic |
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199 | //============================================================================================= |
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200 | |
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201 | // Forward declare abort after the __typeof__ call to avoid ambiguities |
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202 | libcfa_public void exit( int status, const char fmt[], ... ) __attribute__(( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ )); |
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203 | libcfa_public void abort( const char fmt[], ... ) __attribute__(( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ )); |
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204 | libcfa_public void abort( bool signalAbort, const char fmt[], ... ) __attribute__(( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ )); |
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205 | libcfa_public void __abort( bool signalAbort, const char fmt[], va_list args ) __attribute__(( __nothrow__, __leaf__, __noreturn__ )); |
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206 | |
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207 | extern "C" { |
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208 | libcfa_public void abort( void ) __attribute__(( __nothrow__, __leaf__, __noreturn__ )) { |
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209 | abort( false, "%s", "" ); |
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210 | } |
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211 | |
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212 | libcfa_public void __cabi_abort( const char fmt[], ... ) __attribute__(( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ )) { |
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213 | va_list argp; |
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214 | va_start( argp, fmt ); |
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215 | __abort( false, fmt, argp ); |
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216 | va_end( argp ); |
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217 | } |
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218 | |
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219 | libcfa_public void exit( int status ) __attribute__(( __nothrow__, __leaf__, __noreturn__ )) { |
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220 | __cabi_libc.exit( status ); |
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221 | } |
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222 | |
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223 | libcfa_public int real_pthread_create(pthread_t *_thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg){ |
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224 | return __cabi_libc.pthread_create(_thread, attr, start_routine, arg); |
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225 | } |
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226 | |
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227 | libcfa_public int real_pthread_join(pthread_t _thread, void **retval){ |
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228 | return __cabi_libc.pthread_join(_thread, retval); |
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229 | } |
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230 | |
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231 | libcfa_public pthread_t real_pthread_self(void){ |
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232 | return __cabi_libc.pthread_self(); |
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233 | } |
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234 | /* mutex Default attr is PTHREAD_MUTEX_RECURSIVE*/ |
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235 | libcfa_public int real_pthread_mutex_init(pthread_mutex_t *_mutex, const pthread_mutexattr_t *attr){ |
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236 | return __cabi_libc.pthread_mutex_init(_mutex, attr); |
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237 | } |
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238 | libcfa_public int real_pthread_mutex_destroy(pthread_mutex_t *_mutex){ |
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239 | return __cabi_libc.pthread_mutex_destroy(_mutex); |
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240 | } |
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241 | libcfa_public int real_pthread_mutex_lock(pthread_mutex_t *_mutex){ |
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242 | return __cabi_libc.pthread_mutex_lock(_mutex); |
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243 | } |
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244 | libcfa_public int real_pthread_mutex_unlock(pthread_mutex_t *_mutex){ |
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245 | return __cabi_libc.pthread_mutex_unlock(_mutex); |
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246 | } |
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247 | libcfa_public int real_pthread_mutex_trylock(pthread_mutex_t *_mutex){ |
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248 | return __cabi_libc.pthread_mutex_trylock(_mutex); |
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249 | } |
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250 | libcfa_public int real_pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr){ |
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251 | return __cabi_libc.pthread_cond_init(cond, attr); |
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252 | } |
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253 | libcfa_public int real_pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *_mutex){ |
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254 | return __cabi_libc.pthread_cond_wait(cond, _mutex); |
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255 | } |
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256 | libcfa_public int real_pthread_cond_signal(pthread_cond_t *cond){ |
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257 | return __cabi_libc.pthread_cond_signal(cond); |
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258 | } |
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259 | libcfa_public int real_pthread_cond_broadcast(pthread_cond_t *cond){ |
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260 | return __cabi_libc.pthread_cond_broadcast(cond); |
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261 | } |
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262 | libcfa_public int real_pthread_cond_destroy(pthread_cond_t *cond){ |
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263 | return __cabi_libc.pthread_cond_destroy(cond); |
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264 | } |
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265 | libcfa_public int real_pthread_attr_init(pthread_attr_t *attr){ |
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266 | return __cabi_libc.pthread_attr_init(attr); |
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267 | } |
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268 | libcfa_public int real_pthread_attr_destroy(pthread_attr_t *attr){ |
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269 | return __cabi_libc.pthread_attr_destroy(attr); |
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270 | } |
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271 | libcfa_public int real_pthread_attr_setstack( pthread_attr_t *attr, void *stackaddr, size_t stacksize ){ |
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272 | return __cabi_libc.pthread_attr_setstack(attr, stackaddr, stacksize); |
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273 | } |
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274 | libcfa_public int pthread_attr_getstacksize( const pthread_attr_t *attr, size_t *stacksize ){ |
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275 | return __cabi_libc.pthread_attr_getstacksize(attr, stacksize); |
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276 | } |
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277 | |
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278 | } |
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279 | |
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280 | // See concurrency/kernel.cfa and concurrency/preemption.cfa for strong definition used in multi-processor mode. |
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281 | void __kernel_abort_lock( void ) __attribute__(( __nothrow__, __leaf__, __weak__ )) {} |
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282 | void __kernel_abort_msg( char buffer[], int size ) __attribute__(( __nothrow__, __leaf__, __weak__ )) {} |
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283 | int __kernel_abort_lastframe( void ) __attribute__(( __nothrow__, __leaf__, __weak__ )) { return 4; } |
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284 | |
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285 | enum { abort_text_size = 1024 }; |
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286 | static char abort_text[ abort_text_size ]; |
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287 | |
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288 | static void __cfaabi_backtrace( int start ) { |
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289 | enum { Frames = 50, }; // maximum number of stack frames |
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290 | int last = __kernel_abort_lastframe(); // skip last N stack frames |
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291 | |
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292 | void * array[Frames]; |
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293 | size_t size = backtrace( array, Frames ); |
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294 | char ** messages = backtrace_symbols( array, size ); // does not demangle names |
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295 | |
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296 | *index( messages[0], '(' ) = '\0'; // find executable name |
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297 | __cfaabi_bits_print_nolock( STDERR_FILENO, "Stack back trace for: %s\n", messages[0]); |
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298 | |
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299 | for ( unsigned int i = start; i < size - last && messages != 0p; i += 1 ) { |
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300 | char * name = 0p, * offset_begin = 0p, * offset_end = 0p; |
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301 | |
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302 | for ( char * p = messages[i]; *p; p += 1 ) { // find parantheses and +offset |
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303 | //__cfaabi_bits_print_nolock( "X %s\n", p); |
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304 | if ( *p == '(' ) { |
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305 | name = p; |
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306 | } else if ( *p == '+' ) { |
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307 | offset_begin = p; |
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308 | } else if ( *p == ')' ) { |
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309 | offset_end = p; |
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310 | break; |
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311 | } |
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312 | } |
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313 | |
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314 | // if line contains symbol, print it |
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315 | int frameNo = i - start; |
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316 | if ( name && offset_begin && offset_end && name < offset_begin ) { |
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317 | *name++ = '\0'; // delimit strings |
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318 | *offset_begin++ = '\0'; |
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319 | *offset_end++ = '\0'; |
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320 | |
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321 | __cfaabi_bits_print_nolock( STDERR_FILENO, "(%i) %s : %s + %s %s\n", frameNo, messages[i], name, offset_begin, offset_end); |
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322 | } else { // otherwise, print the whole line |
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323 | __cfaabi_bits_print_nolock( STDERR_FILENO, "(%i) %s\n", frameNo, messages[i] ); |
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324 | } |
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325 | } |
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326 | free( messages ); |
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327 | } |
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328 | |
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329 | void exit( int status, const char fmt[], ... ) { |
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330 | va_list args; |
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331 | va_start( args, fmt ); |
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332 | vfprintf( stderr, fmt, args ); |
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333 | va_end( args ); |
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334 | __cabi_libc.exit( status ); |
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335 | } |
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336 | |
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337 | static volatile bool __abort_first = 0; |
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338 | |
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339 | // Cannot forward va_list. |
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340 | void __abort( bool signalAbort, const char fmt[], va_list args ) { |
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341 | // Multiple threads can come here from multiple paths |
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342 | // To make sure this is safe any concurrent/subsequent call to abort is redirected to libc-abort |
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343 | bool first = ! __atomic_test_and_set( &__abort_first, __ATOMIC_SEQ_CST); |
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344 | |
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345 | // Prevent preemption from kicking-in and messing with the abort |
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346 | __kernel_abort_lock(); |
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347 | |
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348 | // first to abort ? |
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349 | if ( !first ) { |
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350 | // We aren't the first to abort just let C handle it |
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351 | signal( SIGABRT, SIG_DFL ); // restore default in case we came here through the function. |
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352 | __cabi_libc.abort(); |
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353 | } |
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354 | |
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355 | int len = snprintf( abort_text, abort_text_size, "Cforall Runtime error (UNIX pid:%ld) ", (long int)getpid() ); // use UNIX pid (versus getPid) |
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356 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
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357 | |
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358 | // print the cause of the error |
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359 | assert( fmt ); |
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360 | len = vsnprintf( abort_text, abort_text_size, fmt, args ); |
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361 | __cfaabi_bits_write( STDERR_FILENO, abort_text, len ); |
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362 | |
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363 | // add optional newline if missing at the end of the format text |
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364 | if ( fmt[strlen( fmt ) - 1] != '\n' ) { |
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365 | __cfaabi_bits_write( STDERR_FILENO, "\n", 1 ); |
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366 | } // if |
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367 | |
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368 | // Give the kernel the chance to add some data in here |
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369 | __kernel_abort_msg( abort_text, abort_text_size ); |
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370 | |
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371 | // print stack trace in handler |
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372 | __cfaabi_backtrace( signalAbort ? 4 : 2 ); |
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373 | |
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374 | // Finally call abort |
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375 | __cabi_libc.abort(); |
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376 | |
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377 | } |
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378 | |
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379 | void abort( const char fmt[], ... ) { |
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380 | va_list args; |
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381 | va_start( args, fmt ); |
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382 | __abort( false, fmt, args ); |
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383 | // CONTROL NEVER REACHES HERE! |
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384 | va_end( args ); |
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385 | } |
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386 | |
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387 | void abort( bool signalAbort, const char fmt[], ... ) { |
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388 | va_list args; |
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389 | va_start( args, fmt ); |
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390 | __abort( signalAbort, fmt, args ); |
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391 | // CONTROL NEVER REACHES HERE! |
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392 | va_end( args ); |
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393 | } |
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394 | |
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395 | void sigHandler_segv( __CFA_SIGPARMS__ ) { |
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396 | if ( sfp->si_addr == 0p ) { |
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397 | abort( true, "Null pointer (0p) dereference.\n" ); |
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398 | } else { |
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399 | abort( true, "%s at memory location %p.\n" |
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400 | "Possible cause is reading outside the address space or writing to a protected area within the address space with an invalid pointer or subscript.\n", |
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401 | (sig == SIGSEGV ? "Segment fault" : "Bus error"), sfp->si_addr ); |
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402 | } |
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403 | } |
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404 | |
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405 | void sigHandler_ill( __CFA_SIGPARMS__ ) { |
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406 | abort( true, "Executing illegal instruction at location %p.\n" |
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407 | "Possible cause is stack corruption.\n", |
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408 | sfp->si_addr ); |
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409 | } |
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410 | |
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411 | void sigHandler_fpe( __CFA_SIGPARMS__ ) { |
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412 | const char * msg; |
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413 | |
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414 | choose( sfp->si_code ) { |
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415 | case FPE_INTDIV, FPE_FLTDIV: msg = "divide by zero"; |
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416 | case FPE_FLTOVF: msg = "overflow"; |
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417 | case FPE_FLTUND: msg = "underflow"; |
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418 | case FPE_FLTRES: msg = "inexact result"; |
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419 | case FPE_FLTINV: msg = "invalid operation"; |
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420 | default: msg = "unknown"; |
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421 | } // choose |
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422 | abort( true, "Computation error %s at location %p.\n", msg, sfp->si_addr ); |
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423 | } |
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424 | |
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425 | void sigHandler_term( __CFA_SIGPARMS__ ) { |
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426 | abort( true, "Application interrupted by signal: %s.\n", strsignal( sig ) ); |
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427 | } |
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428 | |
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429 | // Local Variables: // |
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430 | // mode: c // |
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431 | // tab-width: 4 // |
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432 | // End: // |
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