darwin-crt2.c revision 1.1.1.11
1 /* KeyMgr backwards-compatibility support for Darwin. 2 Copyright (C) 2001-2024 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it under 7 the terms of the GNU General Public License as published by the Free 8 Software Foundation; either version 3, or (at your option) any later 9 version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 for more details. 15 16 Under Section 7 of GPL version 3, you are granted additional 17 permissions described in the GCC Runtime Library Exception, version 18 3.1, as published by the Free Software Foundation. 19 20 You should have received a copy of the GNU General Public License and 21 a copy of the GCC Runtime Library Exception along with this program; 22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 <http://www.gnu.org/licenses/>. */ 24 25 /* It is incorrect to include config.h here, because this file is being 26 compiled for the target, and hence definitions concerning only the host 27 do not apply. */ 28 29 #include "tconfig.h" 30 #include "tsystem.h" 31 32 /* This file doesn't do anything useful on non-powerpc targets, since they 33 don't have backwards compatibility anyway. */ 34 35 #ifdef __ppc__ 36 37 /* Homemade decls substituting for getsect.h and dyld.h, so cross 38 compilation works. */ 39 struct mach_header; 40 extern char *getsectdatafromheader (struct mach_header *, const char *, 41 const char *, unsigned long *); 42 extern void _dyld_register_func_for_add_image 43 (void (*) (struct mach_header *, unsigned long)); 44 extern void _dyld_register_func_for_remove_image 45 (void (*) (struct mach_header *, unsigned long)); 46 47 extern void __darwin_gcc3_preregister_frame_info (void); 48 49 /* These are from "keymgr.h". */ 50 extern void _init_keymgr (void); 51 extern void *_keymgr_get_and_lock_processwide_ptr (unsigned key); 52 extern void _keymgr_set_and_unlock_processwide_ptr (unsigned key, void *ptr); 53 54 extern void *__keymgr_global[]; 55 typedef struct _Sinfo_Node { 56 unsigned int size ; /*size of this node*/ 57 unsigned short major_version ; /*API major version.*/ 58 unsigned short minor_version ; /*API minor version.*/ 59 } _Tinfo_Node ; 60 61 /* KeyMgr 3.x is the first one supporting GCC3 stuff natively. */ 62 #define KEYMGR_API_MAJOR_GCC3 3 63 /* ... with these keys. */ 64 #define KEYMGR_GCC3_LIVE_IMAGE_LIST 301 /* loaded images */ 65 #define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */ 66 67 /* Node of KEYMGR_GCC3_LIVE_IMAGE_LIST. Info about each resident image. */ 68 struct live_images { 69 unsigned long this_size; /* sizeof (live_images) */ 70 struct mach_header *mh; /* the image info */ 71 unsigned long vm_slide; 72 void (*destructor)(struct live_images *); /* destructor for this */ 73 struct live_images *next; 74 unsigned int examined_p; 75 void *fde; 76 void *object_info; 77 unsigned long info[2]; /* Future use. */ 78 }; 79 80 81 /* These routines are used only on Darwin versions before 10.2. 83 Later versions have equivalent code in the system. 84 Eventually, they might go away, although it might be a long time... */ 85 86 static void darwin_unwind_dyld_remove_image_hook 87 (struct mach_header *m, unsigned long s); 88 static void darwin_unwind_dyld_remove_image_hook 89 (struct mach_header *m, unsigned long s); 90 extern void __darwin_gcc3_preregister_frame_info (void); 91 92 static void 93 darwin_unwind_dyld_add_image_hook (struct mach_header *mh, unsigned long slide) 94 { 95 struct live_images *l = (struct live_images *)calloc (1, sizeof (*l)); 96 l->mh = mh; 97 l->vm_slide = slide; 98 l->this_size = sizeof (*l); 99 l->next = (struct live_images *) 100 _keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST); 101 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, l); 102 } 103 104 static void 105 darwin_unwind_dyld_remove_image_hook (struct mach_header *m, unsigned long s) 106 { 107 struct live_images *top, **lip, *destroy = NULL; 108 109 /* Look for it in the list of live images and delete it. */ 110 111 top = (struct live_images *) 112 _keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST); 113 for (lip = ⊤ *lip != NULL; lip = &(*lip)->next) 114 { 115 if ((*lip)->mh == m && (*lip)->vm_slide == s) 116 { 117 destroy = *lip; 118 *lip = destroy->next; /* unlink DESTROY */ 119 120 if (destroy->this_size != sizeof (*destroy)) /* sanity check */ 121 abort (); 122 123 break; 124 } 125 } 126 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, top); 127 128 /* Now that we have unlinked this from the image list, toss it. */ 129 if (destroy != NULL) 130 { 131 if (destroy->destructor != NULL) 132 (*destroy->destructor) (destroy); 133 free (destroy); 134 } 135 } 136 137 void 138 __darwin_gcc3_preregister_frame_info (void) 139 { 140 const _Tinfo_Node *info; 141 _init_keymgr (); 142 info = (_Tinfo_Node *)__keymgr_global[2]; 143 if (info != NULL) 144 { 145 if (info->major_version >= KEYMGR_API_MAJOR_GCC3) 146 return; 147 /* Otherwise, use our own add_image_hooks. */ 148 } 149 150 _dyld_register_func_for_add_image (darwin_unwind_dyld_add_image_hook); 151 _dyld_register_func_for_remove_image (darwin_unwind_dyld_remove_image_hook); 152 } 153 154 #endif /* __ppc__ */ 155
Indexes created Fri Apr 10 00:22:58 UTC 2026