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111
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1 /* fileline.c -- Get file and line number information in a backtrace.
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145
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2 Copyright (C) 2012-2020 Free Software Foundation, Inc.
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111
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3 Written by Ian Lance Taylor, Google.
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4
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5 Redistribution and use in source and binary forms, with or without
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6 modification, are permitted provided that the following conditions are
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7 met:
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8
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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
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12 (2) Redistributions in binary form must reproduce the above copyright
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13 notice, this list of conditions and the following disclaimer in
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14 the documentation and/or other materials provided with the
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15 distribution.
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16
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17 (3) The name of the author may not be used to
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18 endorse or promote products derived from this software without
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19 specific prior written permission.
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20
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21 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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22 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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23 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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24 DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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25 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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26 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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27 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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28 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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29 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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30 IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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31 POSSIBILITY OF SUCH DAMAGE. */
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32
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33 #include "config.h"
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34
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35 #include <sys/types.h>
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36 #include <sys/stat.h>
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37 #include <errno.h>
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38 #include <fcntl.h>
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39 #include <stdlib.h>
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40 #include <unistd.h>
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41
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42 #include "backtrace.h"
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43 #include "internal.h"
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44
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45 #ifndef HAVE_GETEXECNAME
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46 #define getexecname() NULL
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47 #endif
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48
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49 /* Initialize the fileline information from the executable. Returns 1
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50 on success, 0 on failure. */
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51
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52 static int
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53 fileline_initialize (struct backtrace_state *state,
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54 backtrace_error_callback error_callback, void *data)
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55 {
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56 int failed;
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57 fileline fileline_fn;
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58 int pass;
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59 int called_error_callback;
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60 int descriptor;
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61 const char *filename;
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62 char buf[64];
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63
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64 if (!state->threaded)
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65 failed = state->fileline_initialization_failed;
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66 else
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67 failed = backtrace_atomic_load_int (&state->fileline_initialization_failed);
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68
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69 if (failed)
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70 {
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71 error_callback (data, "failed to read executable information", -1);
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72 return 0;
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73 }
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74
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75 if (!state->threaded)
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76 fileline_fn = state->fileline_fn;
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77 else
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78 fileline_fn = backtrace_atomic_load_pointer (&state->fileline_fn);
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79 if (fileline_fn != NULL)
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80 return 1;
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81
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82 /* We have not initialized the information. Do it now. */
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83
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84 descriptor = -1;
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85 called_error_callback = 0;
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86 for (pass = 0; pass < 5; ++pass)
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87 {
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88 int does_not_exist;
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89
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90 switch (pass)
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91 {
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92 case 0:
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93 filename = state->filename;
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94 break;
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95 case 1:
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96 filename = getexecname ();
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97 break;
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98 case 2:
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99 filename = "/proc/self/exe";
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100 break;
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101 case 3:
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102 filename = "/proc/curproc/file";
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103 break;
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104 case 4:
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105 snprintf (buf, sizeof (buf), "/proc/%ld/object/a.out",
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106 (long) getpid ());
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107 filename = buf;
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108 break;
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109 default:
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110 abort ();
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111 }
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112
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113 if (filename == NULL)
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114 continue;
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115
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116 descriptor = backtrace_open (filename, error_callback, data,
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117 &does_not_exist);
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118 if (descriptor < 0 && !does_not_exist)
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119 {
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120 called_error_callback = 1;
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121 break;
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122 }
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123 if (descriptor >= 0)
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124 break;
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125 }
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126
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127 if (descriptor < 0)
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128 {
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129 if (!called_error_callback)
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130 {
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131 if (state->filename != NULL)
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132 error_callback (data, state->filename, ENOENT);
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133 else
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134 error_callback (data,
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135 "libbacktrace could not find executable to open",
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136 0);
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137 }
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138 failed = 1;
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139 }
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140
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141 if (!failed)
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142 {
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143 if (!backtrace_initialize (state, filename, descriptor, error_callback,
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144 data, &fileline_fn))
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145 failed = 1;
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146 }
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147
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148 if (failed)
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149 {
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150 if (!state->threaded)
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151 state->fileline_initialization_failed = 1;
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152 else
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153 backtrace_atomic_store_int (&state->fileline_initialization_failed, 1);
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154 return 0;
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155 }
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156
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157 if (!state->threaded)
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158 state->fileline_fn = fileline_fn;
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159 else
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160 {
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161 backtrace_atomic_store_pointer (&state->fileline_fn, fileline_fn);
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162
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163 /* Note that if two threads initialize at once, one of the data
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164 sets may be leaked. */
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165 }
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166
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167 return 1;
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168 }
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169
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170 /* Given a PC, find the file name, line number, and function name. */
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171
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172 int
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173 backtrace_pcinfo (struct backtrace_state *state, uintptr_t pc,
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174 backtrace_full_callback callback,
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175 backtrace_error_callback error_callback, void *data)
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176 {
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177 if (!fileline_initialize (state, error_callback, data))
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178 return 0;
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179
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180 if (state->fileline_initialization_failed)
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181 return 0;
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182
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183 return state->fileline_fn (state, pc, callback, error_callback, data);
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184 }
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185
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186 /* Given a PC, find the symbol for it, and its value. */
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187
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188 int
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189 backtrace_syminfo (struct backtrace_state *state, uintptr_t pc,
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190 backtrace_syminfo_callback callback,
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191 backtrace_error_callback error_callback, void *data)
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192 {
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193 if (!fileline_initialize (state, error_callback, data))
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194 return 0;
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195
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196 if (state->fileline_initialization_failed)
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197 return 0;
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198
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199 state->syminfo_fn (state, pc, callback, error_callback, data);
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200 return 1;
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201 }
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