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0
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1 /* __cxa_atexit backwards-compatibility support for Darwin.
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2 Copyright (C) 2006, 2009 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* Don't do anything if we are compiling for a kext multilib. */
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26 #ifdef __PIC__
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27
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28 /* It is incorrect to include config.h here, because this file is being
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29 compiled for the target, and hence definitions concerning only the host
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30 do not apply. */
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31
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32 #include "tconfig.h"
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33 #include "tsystem.h"
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34
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35 #include <dlfcn.h>
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36 #include <stdbool.h>
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37 #include <stdlib.h>
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38 #include <string.h>
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39
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40 /* This file works around two different problems.
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41
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42 The first problem is that there is no __cxa_atexit on Mac OS versions
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43 before 10.4. It fixes this by providing a complete atexit and
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44 __cxa_atexit emulation called from the regular atexit.
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45
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46 The second problem is that on all shipping versions of Mac OS,
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47 __cxa_finalize and exit() don't work right: they don't run routines
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48 that were registered while other atexit routines are running. This
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49 is worked around by wrapping each atexit/__cxa_atexit routine with
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50 our own routine which ensures that any __cxa_atexit calls while it
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51 is running are honoured.
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52
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53 There are still problems which this does not solve. Before 10.4,
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54 shared objects linked with previous compilers won't have their
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55 atexit calls properly interleaved with code compiled with newer
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56 compilers. Also, atexit routines registered from shared objects
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57 linked with previous compilers won't get the bug fix. */
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58
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59 typedef int (*cxa_atexit_p)(void (*func) (void*), void* arg, const void* dso);
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60 typedef void (*cxa_finalize_p)(const void *dso);
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61 typedef int (*atexit_p)(void (*func)(void));
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62
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63 /* These are from "keymgr.h". */
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64 extern void *_keymgr_get_and_lock_processwide_ptr (unsigned key);
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65 extern int _keymgr_get_and_lock_processwide_ptr_2 (unsigned, void **);
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66 extern int _keymgr_set_and_unlock_processwide_ptr (unsigned key, void *ptr);
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67
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68 extern void *__keymgr_global[];
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69 typedef struct _Sinfo_Node {
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70 unsigned int size ; /*size of this node*/
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71 unsigned short major_version ; /*API major version.*/
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72 unsigned short minor_version ; /*API minor version.*/
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73 } _Tinfo_Node ;
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74
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75 #ifdef __ppc__
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76 #define CHECK_KEYMGR_ERROR(e) \
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77 (((_Tinfo_Node *)__keymgr_global[2])->major_version >= 4 ? (e) : 0)
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78 #else
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79 #define CHECK_KEYMGR_ERROR(e) (e)
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80 #endif
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81
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82 /* Our globals are stored under this keymgr index. */
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83 #define KEYMGR_ATEXIT_LIST 14
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84
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85 /* The different kinds of callback routines. */
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86 typedef void (*atexit_callback)(void);
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87 typedef void (*cxa_atexit_callback)(void *);
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88
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89 /* This structure holds a routine to call. There may be extra fields
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90 at the end of the structure that this code doesn't know about. */
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91 struct one_atexit_routine
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92 {
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93 union {
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94 atexit_callback ac;
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95 cxa_atexit_callback cac;
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96 } callback;
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97 /* has_arg is 0/2/4 if 'ac' is live, 1/3/5 if 'cac' is live.
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98 Higher numbers indicate a later version of the structure that this
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99 code doesn't understand and will ignore. */
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100 int has_arg;
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101 void * arg;
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102 };
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103
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104 struct atexit_routine_list
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105 {
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106 struct atexit_routine_list * next;
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107 struct one_atexit_routine r;
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108 };
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109
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110 /* The various possibilities for status of atexit(). */
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111 enum atexit_status {
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112 atexit_status_unknown = 0,
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113 atexit_status_missing = 1,
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114 atexit_status_broken = 2,
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115 atexit_status_working = 16
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116 };
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117
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118 struct keymgr_atexit_list
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119 {
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120 /* Version of this list. This code knows only about version 0.
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121 If the version is higher than 0, this code may add new atexit routines
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122 but should not attempt to run the list. */
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123 short version;
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124 /* 1 if an atexit routine is currently being run by this code, 0
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125 otherwise. */
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126 char running_routines;
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127 /* Holds a value from 'enum atexit_status'. */
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128 unsigned char atexit_status;
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129 /* The list of atexit and cxa_atexit routines registered. If
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130 atexit_status_missing it contains all routines registered while
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131 linked with this code. If atexit_status_broken it contains all
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132 routines registered during cxa_finalize while linked with this
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133 code. */
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134 struct atexit_routine_list *l;
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135 /* &__cxa_atexit; set if atexit_status >= atexit_status_broken. */
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136 cxa_atexit_p cxa_atexit_f;
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137 /* &__cxa_finalize; set if atexit_status >= atexit_status_broken. */
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138 cxa_finalize_p cxa_finalize_f;
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139 /* &atexit; set if atexit_status >= atexit_status_working
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140 or atexit_status == atexit_status_missing. */
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141 atexit_p atexit_f;
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142 };
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143
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144 /* Return 0 if __cxa_atexit has the bug it has in Mac OS 10.4: it
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145 fails to call routines registered while an atexit routine is
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146 running. Return 1 if it works properly, and -1 if an error occurred. */
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147
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148 struct atexit_data
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149 {
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150 int result;
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151 cxa_atexit_p cxa_atexit;
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152 };
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153
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154 static void cxa_atexit_check_2 (void *arg)
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155 {
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156 ((struct atexit_data *)arg)->result = 1;
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157 }
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158
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159 static void cxa_atexit_check_1 (void *arg)
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160 {
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161 struct atexit_data * aed = arg;
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162 if (aed->cxa_atexit (cxa_atexit_check_2, arg, arg) != 0)
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163 aed->result = -1;
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164 }
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165
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166 static int
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167 check_cxa_atexit (cxa_atexit_p cxa_atexit, cxa_finalize_p cxa_finalize)
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168 {
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169 struct atexit_data aed = { 0, cxa_atexit };
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170
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171 /* We re-use &aed as the 'dso' parameter, since it's a unique address. */
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172 if (cxa_atexit (cxa_atexit_check_1, &aed, &aed) != 0)
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173 return -1;
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174 cxa_finalize (&aed);
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175 if (aed.result == 0)
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176 {
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177 /* Call __cxa_finalize again to make sure that cxa_atexit_check_2
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178 is removed from the list before AED goes out of scope. */
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179 cxa_finalize (&aed);
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180 aed.result = 0;
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181 }
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182 return aed.result;
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183 }
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184
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185 #ifdef __ppc__
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186 /* This comes from Csu. It works only before 10.4. The prototype has
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187 been altered a bit to avoid casting. */
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188 extern int _dyld_func_lookup(const char *dyld_func_name,
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189 void *address) __attribute__((visibility("hidden")));
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190
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191 static void our_atexit (void);
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192
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193 /* We're running on 10.3.9. Find the address of the system atexit()
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194 function. So easy to say, so hard to do. */
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195 static atexit_p
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196 find_atexit_10_3 (void)
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197 {
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198 unsigned int (*dyld_image_count_fn)(void);
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199 const char *(*dyld_get_image_name_fn)(unsigned int image_index);
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200 const void *(*dyld_get_image_header_fn)(unsigned int image_index);
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201 const void *(*NSLookupSymbolInImage_fn)(const void *image,
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202 const char *symbolName,
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203 unsigned int options);
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204 void *(*NSAddressOfSymbol_fn)(const void *symbol);
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205 unsigned i, count;
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206
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207 /* Find some dyld functions. */
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208 _dyld_func_lookup("__dyld_image_count", &dyld_image_count_fn);
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209 _dyld_func_lookup("__dyld_get_image_name", &dyld_get_image_name_fn);
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210 _dyld_func_lookup("__dyld_get_image_header", &dyld_get_image_header_fn);
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211 _dyld_func_lookup("__dyld_NSLookupSymbolInImage", &NSLookupSymbolInImage_fn);
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212 _dyld_func_lookup("__dyld_NSAddressOfSymbol", &NSAddressOfSymbol_fn);
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213
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214 /* If any of these don't exist, that's an error. */
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215 if (! dyld_image_count_fn || ! dyld_get_image_name_fn
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216 || ! dyld_get_image_header_fn || ! NSLookupSymbolInImage_fn
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217 || ! NSAddressOfSymbol_fn)
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218 return NULL;
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219
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220 count = dyld_image_count_fn ();
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221 for (i = 0; i < count; i++)
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222 {
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223 const char * path = dyld_get_image_name_fn (i);
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224 const void * image;
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225 const void * symbol;
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226
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227 if (strcmp (path, "/usr/lib/libSystem.B.dylib") != 0)
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228 continue;
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229 image = dyld_get_image_header_fn (i);
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230 if (! image)
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231 return NULL;
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232 /* '4' is NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR. */
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233 symbol = NSLookupSymbolInImage_fn (image, "_atexit", 4);
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234 if (! symbol)
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235 return NULL;
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236 return NSAddressOfSymbol_fn (symbol);
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237 }
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238 return NULL;
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239 }
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240 #endif
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241
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242 /* Create (if necessary), find, lock, fill in, and return our globals.
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243 Return NULL on error, in which case the globals will not be locked.
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244 The caller should call keymgr_set_and_unlock. */
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245 static struct keymgr_atexit_list *
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246 get_globals (void)
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247 {
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248 struct keymgr_atexit_list * r;
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249
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250 #ifdef __ppc__
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251 /* 10.3.9 doesn't have _keymgr_get_and_lock_processwide_ptr_2 so the
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252 PPC side can't use it. On 10.4 this just means the error gets
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253 reported a little later when
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254 _keymgr_set_and_unlock_processwide_ptr finds that the key was
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255 never locked. */
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256 r = _keymgr_get_and_lock_processwide_ptr (KEYMGR_ATEXIT_LIST);
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257 #else
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258 void * rr;
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259 if (_keymgr_get_and_lock_processwide_ptr_2 (KEYMGR_ATEXIT_LIST, &rr))
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260 return NULL;
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261 r = rr;
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262 #endif
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263
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264 if (r == NULL)
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265 {
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266 r = calloc (sizeof (struct keymgr_atexit_list), 1);
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267 if (! r)
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268 return NULL;
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269 }
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270
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271 if (r->atexit_status == atexit_status_unknown)
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272 {
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273 void *handle;
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274
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275 handle = dlopen ("/usr/lib/libSystem.B.dylib", RTLD_NOLOAD);
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276 if (!handle)
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277 {
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278 #ifdef __ppc__
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279 r->atexit_status = atexit_status_missing;
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280 r->atexit_f = find_atexit_10_3 ();
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281 if (! r->atexit_f)
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282 goto error;
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283 if (r->atexit_f (our_atexit))
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284 goto error;
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285 #else
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286 goto error;
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287 #endif
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288 }
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289 else
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290 {
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291 int chk_result;
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292
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293 r->cxa_atexit_f = (cxa_atexit_p)dlsym (handle, "__cxa_atexit");
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294 r->cxa_finalize_f = (cxa_finalize_p)dlsym (handle, "__cxa_finalize");
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295 if (! r->cxa_atexit_f || ! r->cxa_finalize_f)
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296 goto error;
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297
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298 chk_result = check_cxa_atexit (r->cxa_atexit_f, r->cxa_finalize_f);
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299 if (chk_result == -1)
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300 goto error;
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301 else if (chk_result == 0)
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302 r->atexit_status = atexit_status_broken;
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303 else
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304 {
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305 r->atexit_f = (atexit_p)dlsym (handle, "atexit");
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306 if (! r->atexit_f)
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307 goto error;
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308 r->atexit_status = atexit_status_working;
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309 }
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310 }
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311 }
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312
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313 return r;
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314
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315 error:
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316 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, r);
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317 return NULL;
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318 }
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319
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320 /* Add TO_ADD to ATEXIT_LIST. ATEXIT_LIST may be NULL but is
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321 always the result of calling _keymgr_get_and_lock_processwide_ptr and
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322 so KEYMGR_ATEXIT_LIST is known to be locked; this routine is responsible
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323 for unlocking it. */
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324
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325 static int
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326 add_routine (struct keymgr_atexit_list * g,
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327 const struct one_atexit_routine * to_add)
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328 {
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329 struct atexit_routine_list * s
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330 = malloc (sizeof (struct atexit_routine_list));
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331 int result;
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332
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333 if (!s)
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334 {
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335 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
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336 return -1;
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337 }
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338 s->r = *to_add;
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339 s->next = g->l;
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340 g->l = s;
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341 result = _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
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342 return CHECK_KEYMGR_ERROR (result) == 0 ? 0 : -1;
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343 }
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344
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345 /* This runs the routines in G->L up to STOP. */
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346 static struct keymgr_atexit_list *
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347 run_routines (struct keymgr_atexit_list *g,
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348 struct atexit_routine_list *stop)
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349 {
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350 for (;;)
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351 {
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352 struct atexit_routine_list * cur = g->l;
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353 if (! cur || cur == stop)
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354 break;
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355 g->l = cur->next;
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356 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
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357
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358 switch (cur->r.has_arg) {
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359 case 0: case 2: case 4:
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360 cur->r.callback.ac ();
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361 break;
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362 case 1: case 3: case 5:
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363 cur->r.callback.cac (cur->r.arg);
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364 break;
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365 default:
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366 /* Don't understand, so don't call it. */
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367 break;
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368 }
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369 free (cur);
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370
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371 g = _keymgr_get_and_lock_processwide_ptr (KEYMGR_ATEXIT_LIST);
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372 if (! g)
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373 break;
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374 }
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375 return g;
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376 }
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377
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378 /* Call the routine described by ROUTINE_PARAM and then call any
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379 routines added to KEYMGR_ATEXIT_LIST while that routine was
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380 running, all with in_cxa_finalize set. */
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381
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382 static void
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383 cxa_atexit_wrapper (void* routine_param)
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384 {
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385 struct one_atexit_routine * routine = routine_param;
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386 struct keymgr_atexit_list *g;
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387 struct atexit_routine_list * base = NULL;
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388 char prev_running = 0;
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389
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390 g = _keymgr_get_and_lock_processwide_ptr (KEYMGR_ATEXIT_LIST);
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391 if (g)
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392 {
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393 prev_running = g->running_routines;
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394 g->running_routines = 1;
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395 base = g->l;
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396 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
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397 }
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398
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399 if (routine->has_arg)
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400 routine->callback.cac (routine->arg);
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401 else
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402 routine->callback.ac ();
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403
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404 if (g)
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405 g = _keymgr_get_and_lock_processwide_ptr (KEYMGR_ATEXIT_LIST);
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406 if (g)
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407 g = run_routines (g, base);
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408 if (g)
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409 {
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410 g->running_routines = prev_running;
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411 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
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412 }
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413 }
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414
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415 #ifdef __ppc__
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416 /* This code is used while running on 10.3.9, when __cxa_atexit doesn't
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417 exist in the system library. 10.3.9 only supported regular PowerPC,
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418 so this code isn't necessary on x86 or ppc64. */
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419
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420 /* This routine is called from the system atexit(); it runs everything
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421 registered on the KEYMGR_ATEXIT_LIST. */
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422
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423 static void
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424 our_atexit (void)
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425 {
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426 struct keymgr_atexit_list *g;
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427 char prev_running;
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428
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429 g = _keymgr_get_and_lock_processwide_ptr (KEYMGR_ATEXIT_LIST);
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430 if (! g || g->version != 0 || g->atexit_status != atexit_status_missing)
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431 return;
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432
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433 prev_running = g->running_routines;
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434 g->running_routines = 1;
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435 g = run_routines (g, NULL);
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436 if (! g)
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437 return;
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438 g->running_routines = prev_running;
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439 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
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440 }
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|
441 #endif
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442
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443 /* This is our wrapper around atexit and __cxa_atexit. It will return
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444 nonzero if an error occurs, and otherwise:
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|
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445 - if in_cxa_finalize is set, or running on 10.3.9, add R to
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|
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446 KEYMGR_ATEXIT_LIST; or
|
|
|
447 - call the system __cxa_atexit to add cxa_atexit_wrapper with an argument
|
|
|
448 that indicates how cxa_atexit_wrapper should call R. */
|
|
|
449
|
|
|
450 static int
|
|
|
451 atexit_common (const struct one_atexit_routine *r, const void *dso)
|
|
|
452 {
|
|
|
453 struct keymgr_atexit_list *g = get_globals ();
|
|
|
454
|
|
|
455 if (! g)
|
|
|
456 return -1;
|
|
|
457
|
|
|
458 if (g->running_routines || g->atexit_status == atexit_status_missing)
|
|
|
459 return add_routine (g, r);
|
|
|
460
|
|
|
461 if (g->atexit_status >= atexit_status_working)
|
|
|
462 {
|
|
|
463 int result;
|
|
|
464 if (r->has_arg)
|
|
|
465 {
|
|
|
466 cxa_atexit_p cxa_atexit = g->cxa_atexit_f;
|
|
|
467 result = _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST,
|
|
|
468 g);
|
|
|
469 if (CHECK_KEYMGR_ERROR (result))
|
|
|
470 return -1;
|
|
|
471 return cxa_atexit (r->callback.cac, r->arg, dso);
|
|
|
472 }
|
|
|
473 else
|
|
|
474 {
|
|
|
475 atexit_p atexit_f = g->atexit_f;
|
|
|
476 result = _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST,
|
|
|
477 g);
|
|
|
478 if (CHECK_KEYMGR_ERROR (result))
|
|
|
479 return -1;
|
|
|
480 return atexit_f (r->callback.ac);
|
|
|
481 }
|
|
|
482 }
|
|
|
483 else
|
|
|
484 {
|
|
|
485 cxa_atexit_p cxa_atexit = g->cxa_atexit_f;
|
|
|
486 struct one_atexit_routine *alloced;
|
|
|
487 int result;
|
|
|
488
|
|
|
489 result = _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
|
|
|
490 if (CHECK_KEYMGR_ERROR (result))
|
|
|
491 return -1;
|
|
|
492
|
|
|
493 alloced = malloc (sizeof (struct one_atexit_routine));
|
|
|
494 if (! alloced)
|
|
|
495 return -1;
|
|
|
496 *alloced = *r;
|
|
|
497 return cxa_atexit (cxa_atexit_wrapper, alloced, dso);
|
|
|
498 }
|
|
|
499 }
|
|
|
500
|
|
|
501 /* These are the actual replacement routines; they just funnel into
|
|
|
502 atexit_common. */
|
|
|
503
|
|
|
504 int __cxa_atexit (cxa_atexit_callback func, void* arg,
|
|
|
505 const void* dso) __attribute__((visibility("hidden")));
|
|
|
506
|
|
|
507 int
|
|
|
508 __cxa_atexit (cxa_atexit_callback func, void* arg, const void* dso)
|
|
|
509 {
|
|
|
510 struct one_atexit_routine r;
|
|
|
511 r.callback.cac = func;
|
|
|
512 r.has_arg = 1;
|
|
|
513 r.arg = arg;
|
|
|
514 return atexit_common (&r, dso);
|
|
|
515 }
|
|
|
516
|
|
|
517 int atexit (atexit_callback func) __attribute__((visibility("hidden")));
|
|
|
518
|
|
|
519 /* Use __dso_handle to allow even bundles that call atexit() to be unloaded
|
|
|
520 on 10.4. */
|
|
|
521 extern void __dso_handle;
|
|
|
522
|
|
|
523 int
|
|
|
524 atexit (atexit_callback func)
|
|
|
525 {
|
|
|
526 struct one_atexit_routine r;
|
|
|
527 r.callback.ac = func;
|
|
|
528 r.has_arg = 0;
|
|
|
529 return atexit_common (&r, &__dso_handle);
|
|
|
530 }
|
|
|
531
|
|
|
532 #endif /* __PIC__ */
|
