1/* KeyMgr backwards-compatibility support for Darwin. 2 Copyright (C) 2001-2020 Free Software Foundation, Inc. 3 4This file is part of GCC. 5 6GCC is free software; you can redistribute it and/or modify it under 7the terms of the GNU General Public License as published by the Free 8Software Foundation; either version 3, or (at your option) any later 9version. 10 11GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12WARRANTY; without even the implied warranty of MERCHANTABILITY or 13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14for more details. 15 16Under Section 7 of GPL version 3, you are granted additional 17permissions described in the GCC Runtime Library Exception, version 183.1, as published by the Free Software Foundation. 19 20You should have received a copy of the GNU General Public License and 21a copy of the GCC Runtime Library Exception along with this program; 22see 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. */ 39struct mach_header; 40extern char *getsectdatafromheader (struct mach_header *, const char *, 41 const char *, unsigned long *); 42extern void _dyld_register_func_for_add_image 43 (void (*) (struct mach_header *, unsigned long)); 44extern void _dyld_register_func_for_remove_image 45 (void (*) (struct mach_header *, unsigned long)); 46 47extern void __darwin_gcc3_preregister_frame_info (void); 48 49/* These are from "keymgr.h". */ 50extern void _init_keymgr (void); 51extern void *_keymgr_get_and_lock_processwide_ptr (unsigned key); 52extern void _keymgr_set_and_unlock_processwide_ptr (unsigned key, void *ptr); 53 54extern void *__keymgr_global[]; 55typedef 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. */ 68struct 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. 82 Later versions have equivalent code in the system. 83 Eventually, they might go away, although it might be a long time... */ 84 85static void darwin_unwind_dyld_remove_image_hook 86 (struct mach_header *m, unsigned long s); 87static void darwin_unwind_dyld_remove_image_hook 88 (struct mach_header *m, unsigned long s); 89extern void __darwin_gcc3_preregister_frame_info (void); 90 91static void 92darwin_unwind_dyld_add_image_hook (struct mach_header *mh, unsigned long slide) 93{ 94 struct live_images *l = (struct live_images *)calloc (1, sizeof (*l)); 95 l->mh = mh; 96 l->vm_slide = slide; 97 l->this_size = sizeof (*l); 98 l->next = (struct live_images *) 99 _keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST); 100 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, l); 101} 102 103static void 104darwin_unwind_dyld_remove_image_hook (struct mach_header *m, unsigned long s) 105{ 106 struct live_images *top, **lip, *destroy = NULL; 107 108 /* Look for it in the list of live images and delete it. */ 109 110 top = (struct live_images *) 111 _keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST); 112 for (lip = ⊤ *lip != NULL; lip = &(*lip)->next) 113 { 114 if ((*lip)->mh == m && (*lip)->vm_slide == s) 115 { 116 destroy = *lip; 117 *lip = destroy->next; /* unlink DESTROY */ 118 119 if (destroy->this_size != sizeof (*destroy)) /* sanity check */ 120 abort (); 121 122 break; 123 } 124 } 125 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, top); 126 127 /* Now that we have unlinked this from the image list, toss it. */ 128 if (destroy != NULL) 129 { 130 if (destroy->destructor != NULL) 131 (*destroy->destructor) (destroy); 132 free (destroy); 133 } 134} 135 136void 137__darwin_gcc3_preregister_frame_info (void) 138{ 139 const _Tinfo_Node *info; 140 _init_keymgr (); 141 info = (_Tinfo_Node *)__keymgr_global[2]; 142 if (info != NULL) 143 { 144 if (info->major_version >= KEYMGR_API_MAJOR_GCC3) 145 return; 146 /* Otherwise, use our own add_image_hooks. */ 147 } 148 149 _dyld_register_func_for_add_image (darwin_unwind_dyld_add_image_hook); 150 _dyld_register_func_for_remove_image (darwin_unwind_dyld_remove_image_hook); 151} 152 153#endif /* __ppc__ */ 154