154 lines
5.3 KiB
C
154 lines
5.3 KiB
C
/* KeyMgr backwards-compatibility support for Darwin.
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Copyright (C) 2001-2022 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* It is incorrect to include config.h here, because this file is being
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compiled for the target, and hence definitions concerning only the host
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do not apply. */
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#include "tconfig.h"
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#include "tsystem.h"
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/* This file doesn't do anything useful on non-powerpc targets, since they
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don't have backwards compatibility anyway. */
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#ifdef __ppc__
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/* Homemade decls substituting for getsect.h and dyld.h, so cross
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compilation works. */
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struct mach_header;
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extern char *getsectdatafromheader (struct mach_header *, const char *,
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const char *, unsigned long *);
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extern void _dyld_register_func_for_add_image
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(void (*) (struct mach_header *, unsigned long));
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extern void _dyld_register_func_for_remove_image
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(void (*) (struct mach_header *, unsigned long));
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extern void __darwin_gcc3_preregister_frame_info (void);
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/* These are from "keymgr.h". */
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extern void _init_keymgr (void);
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extern void *_keymgr_get_and_lock_processwide_ptr (unsigned key);
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extern void _keymgr_set_and_unlock_processwide_ptr (unsigned key, void *ptr);
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extern void *__keymgr_global[];
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typedef struct _Sinfo_Node {
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unsigned int size ; /*size of this node*/
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unsigned short major_version ; /*API major version.*/
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unsigned short minor_version ; /*API minor version.*/
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} _Tinfo_Node ;
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/* KeyMgr 3.x is the first one supporting GCC3 stuff natively. */
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#define KEYMGR_API_MAJOR_GCC3 3
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/* ... with these keys. */
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#define KEYMGR_GCC3_LIVE_IMAGE_LIST 301 /* loaded images */
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#define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */
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/* Node of KEYMGR_GCC3_LIVE_IMAGE_LIST. Info about each resident image. */
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struct live_images {
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unsigned long this_size; /* sizeof (live_images) */
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struct mach_header *mh; /* the image info */
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unsigned long vm_slide;
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void (*destructor)(struct live_images *); /* destructor for this */
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struct live_images *next;
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unsigned int examined_p;
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void *fde;
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void *object_info;
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unsigned long info[2]; /* Future use. */
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};
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/* These routines are used only on Darwin versions before 10.2.
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Later versions have equivalent code in the system.
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Eventually, they might go away, although it might be a long time... */
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static void darwin_unwind_dyld_remove_image_hook
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(struct mach_header *m, unsigned long s);
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static void darwin_unwind_dyld_remove_image_hook
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(struct mach_header *m, unsigned long s);
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extern void __darwin_gcc3_preregister_frame_info (void);
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static void
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darwin_unwind_dyld_add_image_hook (struct mach_header *mh, unsigned long slide)
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{
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struct live_images *l = (struct live_images *)calloc (1, sizeof (*l));
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l->mh = mh;
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l->vm_slide = slide;
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l->this_size = sizeof (*l);
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l->next = (struct live_images *)
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_keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST);
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_keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, l);
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}
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static void
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darwin_unwind_dyld_remove_image_hook (struct mach_header *m, unsigned long s)
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{
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struct live_images *top, **lip, *destroy = NULL;
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/* Look for it in the list of live images and delete it. */
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top = (struct live_images *)
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_keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST);
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for (lip = ⊤ *lip != NULL; lip = &(*lip)->next)
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{
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if ((*lip)->mh == m && (*lip)->vm_slide == s)
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{
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destroy = *lip;
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*lip = destroy->next; /* unlink DESTROY */
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if (destroy->this_size != sizeof (*destroy)) /* sanity check */
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abort ();
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break;
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}
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}
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_keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, top);
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/* Now that we have unlinked this from the image list, toss it. */
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if (destroy != NULL)
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{
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if (destroy->destructor != NULL)
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(*destroy->destructor) (destroy);
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free (destroy);
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}
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}
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void
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__darwin_gcc3_preregister_frame_info (void)
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{
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const _Tinfo_Node *info;
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_init_keymgr ();
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info = (_Tinfo_Node *)__keymgr_global[2];
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if (info != NULL)
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{
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if (info->major_version >= KEYMGR_API_MAJOR_GCC3)
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return;
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/* Otherwise, use our own add_image_hooks. */
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}
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_dyld_register_func_for_add_image (darwin_unwind_dyld_add_image_hook);
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_dyld_register_func_for_remove_image (darwin_unwind_dyld_remove_image_hook);
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}
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#endif /* __ppc__ */
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