1/* KeyMgr backwards-compatibility support for Darwin. 2 Copyright (C) 2001, 2002, 2004 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 2, or (at your option) any later 9version. 10 11In addition to the permissions in the GNU General Public License, the 12Free Software Foundation gives you unlimited permission to link the 13compiled version of this file into combinations with other programs, 14and to distribute those combinations without any restriction coming 15from the use of this file. (The General Public License restrictions 16do apply in other respects; for example, they cover modification of 17the file, and distribution when not linked into a combine 18executable.) 19 20GCC is distributed in the hope that it will be useful, but WITHOUT ANY 21WARRANTY; without even the implied warranty of MERCHANTABILITY or 22FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 23for more details. 24 25You should have received a copy of the GNU General Public License 26along with GCC; see the file COPYING. If not, write to the Free 27Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 2802110-1301, USA. */ 29 30/* It is incorrect to include config.h here, because this file is being 31 compiled for the target, and hence definitions concerning only the host 32 do not apply. */ 33 34#include "tconfig.h" 35#include "tsystem.h" 36 37/* This file doesn't do anything useful on non-powerpc targets, since they 38 don't have backwards compatibility anyway. */ 39 40#ifdef __ppc__ 41 42/* Homemade decls substituting for getsect.h and dyld.h, so cross 43 compilation works. */ 44struct mach_header; 45extern char *getsectdatafromheader (struct mach_header *, const char *, 46 const char *, unsigned long *); 47extern void _dyld_register_func_for_add_image 48 (void (*) (struct mach_header *, unsigned long)); 49extern void _dyld_register_func_for_remove_image 50 (void (*) (struct mach_header *, unsigned long)); 51 52extern void __darwin_gcc3_preregister_frame_info (void); 53 54/* These are from "keymgr.h". */ 55extern void _init_keymgr (void); 56extern void *_keymgr_get_and_lock_processwide_ptr (unsigned key); 57extern void _keymgr_set_and_unlock_processwide_ptr (unsigned key, void *ptr); 58 59extern void *__keymgr_global[]; 60typedef struct _Sinfo_Node { 61 unsigned int size ; /*size of this node*/ 62 unsigned short major_version ; /*API major version.*/ 63 unsigned short minor_version ; /*API minor version.*/ 64 } _Tinfo_Node ; 65 66/* KeyMgr 3.x is the first one supporting GCC3 stuff natively. */ 67#define KEYMGR_API_MAJOR_GCC3 3 68/* ... with these keys. */ 69#define KEYMGR_GCC3_LIVE_IMAGE_LIST 301 /* loaded images */ 70#define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */ 71 72/* Node of KEYMGR_GCC3_LIVE_IMAGE_LIST. Info about each resident image. */ 73struct live_images { 74 unsigned long this_size; /* sizeof (live_images) */ 75 struct mach_header *mh; /* the image info */ 76 unsigned long vm_slide; 77 void (*destructor)(struct live_images *); /* destructor for this */ 78 struct live_images *next; 79 unsigned int examined_p; 80 void *fde; 81 void *object_info; 82 unsigned long info[2]; /* Future use. */ 83}; 84 85 86/* These routines are used only on Darwin versions before 10.2. 87 Later versions have equivalent code in the system. 88 Eventually, they might go away, although it might be a long time... */ 89 90static void darwin_unwind_dyld_remove_image_hook 91 (struct mach_header *m, unsigned long s); 92static void darwin_unwind_dyld_remove_image_hook 93 (struct mach_header *m, unsigned long s); 94extern void __darwin_gcc3_preregister_frame_info (void); 95 96static void 97darwin_unwind_dyld_add_image_hook (struct mach_header *mh, unsigned long slide) 98{ 99 struct live_images *l = (struct live_images *)calloc (1, sizeof (*l)); 100 l->mh = mh; 101 l->vm_slide = slide; 102 l->this_size = sizeof (*l); 103 l->next = (struct live_images *) 104 _keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST); 105 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, l); 106} 107 108static void 109darwin_unwind_dyld_remove_image_hook (struct mach_header *m, unsigned long s) 110{ 111 struct live_images *top, **lip, *destroy = NULL; 112 113 /* Look for it in the list of live images and delete it. */ 114 115 top = (struct live_images *) 116 _keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST); 117 for (lip = ⊤ *lip != NULL; lip = &(*lip)->next) 118 { 119 if ((*lip)->mh == m && (*lip)->vm_slide == s) 120 { 121 destroy = *lip; 122 *lip = destroy->next; /* unlink DESTROY */ 123 124 if (destroy->this_size != sizeof (*destroy)) /* sanity check */ 125 abort (); 126 127 break; 128 } 129 } 130 _keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, top); 131 132 /* Now that we have unlinked this from the image list, toss it. */ 133 if (destroy != NULL) 134 { 135 if (destroy->destructor != NULL) 136 (*destroy->destructor) (destroy); 137 free (destroy); 138 } 139} 140 141void 142__darwin_gcc3_preregister_frame_info (void) 143{ 144 const _Tinfo_Node *info; 145 _init_keymgr (); 146 info = (_Tinfo_Node *)__keymgr_global[2]; 147 if (info != NULL) 148 { 149 if (info->major_version >= KEYMGR_API_MAJOR_GCC3) 150 return; 151 /* Otherwise, use our own add_image_hooks. */ 152 } 153 154 _dyld_register_func_for_add_image (darwin_unwind_dyld_add_image_hook); 155 _dyld_register_func_for_remove_image (darwin_unwind_dyld_remove_image_hook); 156} 157 158#endif /* __ppc__ */ 159