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1 /* KeyMgr backwards-compatibility support for Darwin.
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2 Copyright (C) 2001, 2002, 2004, 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 /* It is incorrect to include config.h here, because this file is being
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26 compiled for the target, and hence definitions concerning only the host
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27 do not apply. */
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28
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29 #include "tconfig.h"
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30 #include "tsystem.h"
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31
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32 /* This file doesn't do anything useful on non-powerpc targets, since they
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33 don't have backwards compatibility anyway. */
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34
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35 #ifdef __ppc__
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36
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37 /* Homemade decls substituting for getsect.h and dyld.h, so cross
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38 compilation works. */
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39 struct mach_header;
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40 extern char *getsectdatafromheader (struct mach_header *, const char *,
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41 const char *, unsigned long *);
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42 extern void _dyld_register_func_for_add_image
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43 (void (*) (struct mach_header *, unsigned long));
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44 extern void _dyld_register_func_for_remove_image
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45 (void (*) (struct mach_header *, unsigned long));
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46
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47 extern void __darwin_gcc3_preregister_frame_info (void);
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48
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49 /* These are from "keymgr.h". */
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50 extern void _init_keymgr (void);
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51 extern void *_keymgr_get_and_lock_processwide_ptr (unsigned key);
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52 extern void _keymgr_set_and_unlock_processwide_ptr (unsigned key, void *ptr);
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53
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54 extern void *__keymgr_global[];
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55 typedef struct _Sinfo_Node {
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56 unsigned int size ; /*size of this node*/
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57 unsigned short major_version ; /*API major version.*/
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58 unsigned short minor_version ; /*API minor version.*/
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59 } _Tinfo_Node ;
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60
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61 /* KeyMgr 3.x is the first one supporting GCC3 stuff natively. */
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62 #define KEYMGR_API_MAJOR_GCC3 3
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63 /* ... with these keys. */
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64 #define KEYMGR_GCC3_LIVE_IMAGE_LIST 301 /* loaded images */
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65 #define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */
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66
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67 /* Node of KEYMGR_GCC3_LIVE_IMAGE_LIST. Info about each resident image. */
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68 struct live_images {
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69 unsigned long this_size; /* sizeof (live_images) */
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70 struct mach_header *mh; /* the image info */
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71 unsigned long vm_slide;
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72 void (*destructor)(struct live_images *); /* destructor for this */
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73 struct live_images *next;
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74 unsigned int examined_p;
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75 void *fde;
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76 void *object_info;
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77 unsigned long info[2]; /* Future use. */
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78 };
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79
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80
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81 /* These routines are used only on Darwin versions before 10.2.
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82 Later versions have equivalent code in the system.
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83 Eventually, they might go away, although it might be a long time... */
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84
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85 static void darwin_unwind_dyld_remove_image_hook
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86 (struct mach_header *m, unsigned long s);
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87 static void darwin_unwind_dyld_remove_image_hook
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88 (struct mach_header *m, unsigned long s);
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89 extern void __darwin_gcc3_preregister_frame_info (void);
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90
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91 static void
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92 darwin_unwind_dyld_add_image_hook (struct mach_header *mh, unsigned long slide)
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93 {
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94 struct live_images *l = (struct live_images *)calloc (1, sizeof (*l));
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95 l->mh = mh;
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96 l->vm_slide = slide;
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97 l->this_size = sizeof (*l);
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98 l->next = (struct live_images *)
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99 _keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST);
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100 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, l);
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101 }
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102
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103 static void
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104 darwin_unwind_dyld_remove_image_hook (struct mach_header *m, unsigned long s)
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105 {
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106 struct live_images *top, **lip, *destroy = NULL;
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107
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108 /* Look for it in the list of live images and delete it. */
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109
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110 top = (struct live_images *)
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111 _keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST);
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112 for (lip = ⊤ *lip != NULL; lip = &(*lip)->next)
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113 {
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114 if ((*lip)->mh == m && (*lip)->vm_slide == s)
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115 {
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116 destroy = *lip;
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117 *lip = destroy->next; /* unlink DESTROY */
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118
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119 if (destroy->this_size != sizeof (*destroy)) /* sanity check */
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120 abort ();
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121
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122 break;
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123 }
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124 }
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125 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, top);
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126
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127 /* Now that we have unlinked this from the image list, toss it. */
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128 if (destroy != NULL)
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129 {
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130 if (destroy->destructor != NULL)
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131 (*destroy->destructor) (destroy);
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132 free (destroy);
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133 }
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134 }
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135
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136 void
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137 __darwin_gcc3_preregister_frame_info (void)
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138 {
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139 const _Tinfo_Node *info;
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140 _init_keymgr ();
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141 info = (_Tinfo_Node *)__keymgr_global[2];
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142 if (info != NULL)
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143 {
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144 if (info->major_version >= KEYMGR_API_MAJOR_GCC3)
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145 return;
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146 /* Otherwise, use our own add_image_hooks. */
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147 }
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148
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149 _dyld_register_func_for_add_image (darwin_unwind_dyld_add_image_hook);
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150 _dyld_register_func_for_remove_image (darwin_unwind_dyld_remove_image_hook);
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151 }
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152
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153 #endif /* __ppc__ */
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