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111
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1 /* __cxa_atexit backwards-compatibility support for Darwin.
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131
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2 Copyright (C) 2006-2018 Free Software Foundation, Inc.
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111
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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 #include "tconfig.h"
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29 #include "tsystem.h"
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30
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31 #include <dlfcn.h>
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32 #include <stdbool.h>
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33 #include <stdlib.h>
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34 #include <string.h>
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35
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36 /* This file works around two different problems.
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37
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38 The first problem is that there is no __cxa_atexit on Mac OS versions
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39 before 10.4. It fixes this by providing a complete atexit and
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40 __cxa_atexit emulation called from the regular atexit.
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41
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42 The second problem is that on all shipping versions of Mac OS,
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43 __cxa_finalize and exit() don't work right: they don't run routines
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44 that were registered while other atexit routines are running. This
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45 is worked around by wrapping each atexit/__cxa_atexit routine with
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46 our own routine which ensures that any __cxa_atexit calls while it
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47 is running are honoured.
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48
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49 There are still problems which this does not solve. Before 10.4,
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50 shared objects linked with previous compilers won't have their
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51 atexit calls properly interleaved with code compiled with newer
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52 compilers. Also, atexit routines registered from shared objects
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53 linked with previous compilers won't get the bug fix. */
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54
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55 typedef int (*cxa_atexit_p)(void (*func) (void*), void* arg, const void* dso);
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56 typedef void (*cxa_finalize_p)(const void *dso);
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57 typedef int (*atexit_p)(void (*func)(void));
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58
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59 /* These are from "keymgr.h". */
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60 extern void *_keymgr_get_and_lock_processwide_ptr (unsigned key);
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61 extern int _keymgr_get_and_lock_processwide_ptr_2 (unsigned, void **);
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62 extern int _keymgr_set_and_unlock_processwide_ptr (unsigned key, void *ptr);
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63
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64 extern void *__keymgr_global[];
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65 typedef struct _Sinfo_Node {
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66 unsigned int size ; /*size of this node*/
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67 unsigned short major_version ; /*API major version.*/
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68 unsigned short minor_version ; /*API minor version.*/
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69 } _Tinfo_Node ;
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70
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71 #ifdef __ppc__
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72 #define CHECK_KEYMGR_ERROR(e) \
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73 (((_Tinfo_Node *)__keymgr_global[2])->major_version >= 4 ? (e) : 0)
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74 #else
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75 #define CHECK_KEYMGR_ERROR(e) (e)
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76 #endif
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77
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78 /* Our globals are stored under this keymgr index. */
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79 #define KEYMGR_ATEXIT_LIST 14
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80
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81 /* The different kinds of callback routines. */
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82 typedef void (*atexit_callback)(void);
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83 typedef void (*cxa_atexit_callback)(void *);
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84
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85 /* This structure holds a routine to call. There may be extra fields
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86 at the end of the structure that this code doesn't know about. */
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87 struct one_atexit_routine
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88 {
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89 union {
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90 atexit_callback ac;
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91 cxa_atexit_callback cac;
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92 } callback;
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93 /* has_arg is 0/2/4 if 'ac' is live, 1/3/5 if 'cac' is live.
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94 Higher numbers indicate a later version of the structure that this
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95 code doesn't understand and will ignore. */
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96 int has_arg;
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97 void * arg;
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98 };
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99
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100 struct atexit_routine_list
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101 {
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102 struct atexit_routine_list * next;
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103 struct one_atexit_routine r;
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104 };
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105
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106 /* The various possibilities for status of atexit(). */
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107 enum atexit_status {
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108 atexit_status_unknown = 0,
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109 atexit_status_missing = 1,
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110 atexit_status_broken = 2,
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111 atexit_status_working = 16
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112 };
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113
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114 struct keymgr_atexit_list
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115 {
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116 /* Version of this list. This code knows only about version 0.
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117 If the version is higher than 0, this code may add new atexit routines
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118 but should not attempt to run the list. */
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119 short version;
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120 /* 1 if an atexit routine is currently being run by this code, 0
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121 otherwise. */
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122 char running_routines;
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123 /* Holds a value from 'enum atexit_status'. */
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124 unsigned char atexit_status;
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125 /* The list of atexit and cxa_atexit routines registered. If
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126 atexit_status_missing it contains all routines registered while
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127 linked with this code. If atexit_status_broken it contains all
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128 routines registered during cxa_finalize while linked with this
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129 code. */
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130 struct atexit_routine_list *l;
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131 /* &__cxa_atexit; set if atexit_status >= atexit_status_broken. */
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132 cxa_atexit_p cxa_atexit_f;
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133 /* &__cxa_finalize; set if atexit_status >= atexit_status_broken. */
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134 cxa_finalize_p cxa_finalize_f;
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135 /* &atexit; set if atexit_status >= atexit_status_working
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136 or atexit_status == atexit_status_missing. */
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137 atexit_p atexit_f;
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138 };
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139
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140 /* Return 0 if __cxa_atexit has the bug it has in Mac OS 10.4: it
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141 fails to call routines registered while an atexit routine is
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142 running. Return 1 if it works properly, and -1 if an error occurred. */
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143
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144 struct atexit_data
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145 {
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146 int result;
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147 cxa_atexit_p cxa_atexit;
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148 };
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149
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150 static void cxa_atexit_check_2 (void *arg)
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151 {
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152 ((struct atexit_data *)arg)->result = 1;
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153 }
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154
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155 static void cxa_atexit_check_1 (void *arg)
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156 {
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157 struct atexit_data * aed = arg;
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158 if (aed->cxa_atexit (cxa_atexit_check_2, arg, arg) != 0)
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159 aed->result = -1;
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160 }
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161
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162 static int
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163 check_cxa_atexit (cxa_atexit_p cxa_atexit, cxa_finalize_p cxa_finalize)
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164 {
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165 struct atexit_data aed = { 0, cxa_atexit };
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166
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167 /* We re-use &aed as the 'dso' parameter, since it's a unique address. */
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168 if (cxa_atexit (cxa_atexit_check_1, &aed, &aed) != 0)
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169 return -1;
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170 cxa_finalize (&aed);
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171 if (aed.result == 0)
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172 {
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173 /* Call __cxa_finalize again to make sure that cxa_atexit_check_2
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174 is removed from the list before AED goes out of scope. */
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175 cxa_finalize (&aed);
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176 aed.result = 0;
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177 }
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178 return aed.result;
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179 }
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180
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181 #ifdef __ppc__
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182 /* This comes from Csu. It works only before 10.4. The prototype has
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183 been altered a bit to avoid casting. */
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184 extern int _dyld_func_lookup(const char *dyld_func_name,
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185 void *address) __attribute__((visibility("hidden")));
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186
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187 static void our_atexit (void);
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188
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189 /* We're running on 10.3.9. Find the address of the system atexit()
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190 function. So easy to say, so hard to do. */
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191 static atexit_p
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192 find_atexit_10_3 (void)
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193 {
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194 unsigned int (*dyld_image_count_fn)(void);
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195 const char *(*dyld_get_image_name_fn)(unsigned int image_index);
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196 const void *(*dyld_get_image_header_fn)(unsigned int image_index);
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197 const void *(*NSLookupSymbolInImage_fn)(const void *image,
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198 const char *symbolName,
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199 unsigned int options);
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200 void *(*NSAddressOfSymbol_fn)(const void *symbol);
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201 unsigned i, count;
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202
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203 /* Find some dyld functions. */
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204 _dyld_func_lookup("__dyld_image_count", &dyld_image_count_fn);
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205 _dyld_func_lookup("__dyld_get_image_name", &dyld_get_image_name_fn);
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206 _dyld_func_lookup("__dyld_get_image_header", &dyld_get_image_header_fn);
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207 _dyld_func_lookup("__dyld_NSLookupSymbolInImage", &NSLookupSymbolInImage_fn);
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208 _dyld_func_lookup("__dyld_NSAddressOfSymbol", &NSAddressOfSymbol_fn);
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209
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210 /* If any of these don't exist, that's an error. */
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211 if (! dyld_image_count_fn || ! dyld_get_image_name_fn
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212 || ! dyld_get_image_header_fn || ! NSLookupSymbolInImage_fn
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213 || ! NSAddressOfSymbol_fn)
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214 return NULL;
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215
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216 count = dyld_image_count_fn ();
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217 for (i = 0; i < count; i++)
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218 {
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219 const char * path = dyld_get_image_name_fn (i);
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220 const void * image;
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221 const void * symbol;
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222
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223 if (strcmp (path, "/usr/lib/libSystem.B.dylib") != 0)
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224 continue;
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225 image = dyld_get_image_header_fn (i);
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226 if (! image)
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227 return NULL;
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228 /* '4' is NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR. */
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229 symbol = NSLookupSymbolInImage_fn (image, "_atexit", 4);
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230 if (! symbol)
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231 return NULL;
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232 return NSAddressOfSymbol_fn (symbol);
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233 }
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234 return NULL;
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235 }
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236 #endif
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237
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238 /* Create (if necessary), find, lock, fill in, and return our globals.
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239 Return NULL on error, in which case the globals will not be locked.
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240 The caller should call keymgr_set_and_unlock. */
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241 static struct keymgr_atexit_list *
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242 get_globals (void)
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243 {
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244 struct keymgr_atexit_list * r;
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245
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246 #ifdef __ppc__
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247 /* 10.3.9 doesn't have _keymgr_get_and_lock_processwide_ptr_2 so the
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248 PPC side can't use it. On 10.4 this just means the error gets
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249 reported a little later when
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250 _keymgr_set_and_unlock_processwide_ptr finds that the key was
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251 never locked. */
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252 r = _keymgr_get_and_lock_processwide_ptr (KEYMGR_ATEXIT_LIST);
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253 #else
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254 void * rr;
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255 if (_keymgr_get_and_lock_processwide_ptr_2 (KEYMGR_ATEXIT_LIST, &rr))
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256 return NULL;
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257 r = rr;
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258 #endif
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259
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260 if (r == NULL)
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261 {
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262 r = calloc (sizeof (struct keymgr_atexit_list), 1);
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263 if (! r)
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264 return NULL;
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265 }
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266
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267 if (r->atexit_status == atexit_status_unknown)
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268 {
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269 void *handle;
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270
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271 handle = dlopen ("/usr/lib/libSystem.B.dylib", RTLD_NOLOAD);
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272 if (!handle)
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273 {
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274 #ifdef __ppc__
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275 r->atexit_status = atexit_status_missing;
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276 r->atexit_f = find_atexit_10_3 ();
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277 if (! r->atexit_f)
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278 goto error;
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279 if (r->atexit_f (our_atexit))
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280 goto error;
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281 #else
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282 goto error;
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283 #endif
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284 }
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285 else
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286 {
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287 int chk_result;
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288
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289 r->cxa_atexit_f = (cxa_atexit_p)dlsym (handle, "__cxa_atexit");
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290 r->cxa_finalize_f = (cxa_finalize_p)dlsym (handle, "__cxa_finalize");
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291 if (! r->cxa_atexit_f || ! r->cxa_finalize_f)
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292 goto error;
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293
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294 chk_result = check_cxa_atexit (r->cxa_atexit_f, r->cxa_finalize_f);
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295 if (chk_result == -1)
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296 goto error;
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297 else if (chk_result == 0)
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298 r->atexit_status = atexit_status_broken;
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299 else
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300 {
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301 r->atexit_f = (atexit_p)dlsym (handle, "atexit");
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302 if (! r->atexit_f)
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303 goto error;
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304 r->atexit_status = atexit_status_working;
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305 }
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306 }
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307 }
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308
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309 return r;
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310
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311 error:
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312 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, r);
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313 return NULL;
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314 }
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315
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316 /* Add TO_ADD to ATEXIT_LIST. ATEXIT_LIST may be NULL but is
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317 always the result of calling _keymgr_get_and_lock_processwide_ptr and
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318 so KEYMGR_ATEXIT_LIST is known to be locked; this routine is responsible
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319 for unlocking it. */
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320
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321 static int
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322 add_routine (struct keymgr_atexit_list * g,
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323 const struct one_atexit_routine * to_add)
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324 {
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325 struct atexit_routine_list * s
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326 = malloc (sizeof (struct atexit_routine_list));
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327 int result;
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328
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329 if (!s)
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330 {
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331 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
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332 return -1;
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333 }
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334 s->r = *to_add;
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335 s->next = g->l;
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336 g->l = s;
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337 result = _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
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338 return CHECK_KEYMGR_ERROR (result) == 0 ? 0 : -1;
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339 }
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340
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341 /* This runs the routines in G->L up to STOP. */
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342 static struct keymgr_atexit_list *
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343 run_routines (struct keymgr_atexit_list *g,
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344 struct atexit_routine_list *stop)
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345 {
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346 for (;;)
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347 {
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348 struct atexit_routine_list * cur = g->l;
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349 if (! cur || cur == stop)
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350 break;
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351 g->l = cur->next;
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352 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
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353
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354 switch (cur->r.has_arg) {
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355 case 0: case 2: case 4:
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356 cur->r.callback.ac ();
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357 break;
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358 case 1: case 3: case 5:
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359 cur->r.callback.cac (cur->r.arg);
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360 break;
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361 default:
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362 /* Don't understand, so don't call it. */
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363 break;
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364 }
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365 free (cur);
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366
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367 g = _keymgr_get_and_lock_processwide_ptr (KEYMGR_ATEXIT_LIST);
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368 if (! g)
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369 break;
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370 }
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371 return g;
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372 }
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373
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374 /* Call the routine described by ROUTINE_PARAM and then call any
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375 routines added to KEYMGR_ATEXIT_LIST while that routine was
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376 running, all with in_cxa_finalize set. */
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377
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378 static void
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379 cxa_atexit_wrapper (void* routine_param)
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380 {
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381 struct one_atexit_routine * routine = routine_param;
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382 struct keymgr_atexit_list *g;
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383 struct atexit_routine_list * base = NULL;
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384 char prev_running = 0;
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385
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386 g = _keymgr_get_and_lock_processwide_ptr (KEYMGR_ATEXIT_LIST);
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387 if (g)
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388 {
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389 prev_running = g->running_routines;
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390 g->running_routines = 1;
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391 base = g->l;
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392 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
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393 }
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394
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395 if (routine->has_arg)
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396 routine->callback.cac (routine->arg);
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397 else
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398 routine->callback.ac ();
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399
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400 if (g)
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401 g = _keymgr_get_and_lock_processwide_ptr (KEYMGR_ATEXIT_LIST);
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402 if (g)
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403 g = run_routines (g, base);
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404 if (g)
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405 {
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406 g->running_routines = prev_running;
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407 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
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408 }
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409 }
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410
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411 #ifdef __ppc__
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412 /* This code is used while running on 10.3.9, when __cxa_atexit doesn't
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413 exist in the system library. 10.3.9 only supported regular PowerPC,
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414 so this code isn't necessary on x86 or ppc64. */
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415
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416 /* This routine is called from the system atexit(); it runs everything
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417 registered on the KEYMGR_ATEXIT_LIST. */
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418
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419 static void
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420 our_atexit (void)
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421 {
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422 struct keymgr_atexit_list *g;
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423 char prev_running;
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424
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425 g = _keymgr_get_and_lock_processwide_ptr (KEYMGR_ATEXIT_LIST);
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426 if (! g || g->version != 0 || g->atexit_status != atexit_status_missing)
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427 return;
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428
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|
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429 prev_running = g->running_routines;
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|
|
430 g->running_routines = 1;
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|
|
431 g = run_routines (g, NULL);
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|
|
432 if (! g)
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433 return;
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|
|
434 g->running_routines = prev_running;
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|
|
435 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
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|
|
436 }
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|
|
437 #endif
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|
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438
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|
|
439 /* This is our wrapper around atexit and __cxa_atexit. It will return
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|
|
440 nonzero if an error occurs, and otherwise:
|
|
|
441 - if in_cxa_finalize is set, or running on 10.3.9, add R to
|
|
|
442 KEYMGR_ATEXIT_LIST; or
|
|
|
443 - call the system __cxa_atexit to add cxa_atexit_wrapper with an argument
|
|
|
444 that indicates how cxa_atexit_wrapper should call R. */
|
|
|
445
|
|
|
446 static int
|
|
|
447 atexit_common (const struct one_atexit_routine *r, const void *dso)
|
|
|
448 {
|
|
|
449 struct keymgr_atexit_list *g = get_globals ();
|
|
|
450
|
|
|
451 if (! g)
|
|
|
452 return -1;
|
|
|
453
|
|
|
454 if (g->running_routines || g->atexit_status == atexit_status_missing)
|
|
|
455 return add_routine (g, r);
|
|
|
456
|
|
|
457 if (g->atexit_status >= atexit_status_working)
|
|
|
458 {
|
|
|
459 int result;
|
|
|
460 if (r->has_arg)
|
|
|
461 {
|
|
|
462 cxa_atexit_p cxa_atexit = g->cxa_atexit_f;
|
|
|
463 result = _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST,
|
|
|
464 g);
|
|
|
465 if (CHECK_KEYMGR_ERROR (result))
|
|
|
466 return -1;
|
|
|
467 return cxa_atexit (r->callback.cac, r->arg, dso);
|
|
|
468 }
|
|
|
469 else
|
|
|
470 {
|
|
|
471 atexit_p atexit_f = g->atexit_f;
|
|
|
472 result = _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST,
|
|
|
473 g);
|
|
|
474 if (CHECK_KEYMGR_ERROR (result))
|
|
|
475 return -1;
|
|
|
476 return atexit_f (r->callback.ac);
|
|
|
477 }
|
|
|
478 }
|
|
|
479 else
|
|
|
480 {
|
|
|
481 cxa_atexit_p cxa_atexit = g->cxa_atexit_f;
|
|
|
482 struct one_atexit_routine *alloced;
|
|
|
483 int result;
|
|
|
484
|
|
|
485 result = _keymgr_set_and_unlock_processwide_ptr (KEYMGR_ATEXIT_LIST, g);
|
|
|
486 if (CHECK_KEYMGR_ERROR (result))
|
|
|
487 return -1;
|
|
|
488
|
|
|
489 alloced = malloc (sizeof (struct one_atexit_routine));
|
|
|
490 if (! alloced)
|
|
|
491 return -1;
|
|
|
492 *alloced = *r;
|
|
|
493 return cxa_atexit (cxa_atexit_wrapper, alloced, dso);
|
|
|
494 }
|
|
|
495 }
|
|
|
496
|
|
|
497 /* These are the actual replacement routines; they just funnel into
|
|
|
498 atexit_common. */
|
|
|
499
|
|
|
500 int __cxa_atexit (cxa_atexit_callback func, void* arg,
|
|
|
501 const void* dso) __attribute__((visibility("hidden")));
|
|
|
502
|
|
|
503 int
|
|
|
504 __cxa_atexit (cxa_atexit_callback func, void* arg, const void* dso)
|
|
|
505 {
|
|
|
506 struct one_atexit_routine r;
|
|
|
507 r.callback.cac = func;
|
|
|
508 r.has_arg = 1;
|
|
|
509 r.arg = arg;
|
|
|
510 return atexit_common (&r, dso);
|
|
|
511 }
|
|
|
512
|
|
|
513 int atexit (atexit_callback func) __attribute__((visibility("hidden")));
|
|
|
514
|
|
|
515 /* Use __dso_handle to allow even bundles that call atexit() to be unloaded
|
|
|
516 on 10.4. */
|
|
|
517 extern void __dso_handle;
|
|
|
518
|
|
|
519 int
|
|
|
520 atexit (atexit_callback func)
|
|
|
521 {
|
|
|
522 struct one_atexit_routine r;
|
|
|
523 r.callback.ac = func;
|
|
|
524 r.has_arg = 0;
|
|
|
525 return atexit_common (&r, &__dso_handle);
|
|
|
526 }
|
|
|
527
|
|
|
528 #endif /* __PIC__ */
|
