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/* KeyMgr backwards-compatibility support for Darwin.
Copyright (C) 2001-2017 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* It is incorrect to include config.h here, because this file is being
compiled for the target, and hence definitions concerning only the host
do not apply. */
#include "tconfig.h"
#include "tsystem.h"
/* This file doesn't do anything useful on non-powerpc targets, since they
don't have backwards compatibility anyway. */
#ifdef __ppc__
/* Homemade decls substituting for getsect.h and dyld.h, so cross
compilation works. */
struct mach_header;
extern char *getsectdatafromheader (struct mach_header *, const char *,
const char *, unsigned long *);
extern void _dyld_register_func_for_add_image
(void (*) (struct mach_header *, unsigned long));
extern void _dyld_register_func_for_remove_image
(void (*) (struct mach_header *, unsigned long));
extern void __darwin_gcc3_preregister_frame_info (void);
/* These are from "keymgr.h". */
extern void _init_keymgr (void);
extern void *_keymgr_get_and_lock_processwide_ptr (unsigned key);
extern void _keymgr_set_and_unlock_processwide_ptr (unsigned key, void *ptr);
extern void *__keymgr_global[];
typedef struct _Sinfo_Node {
unsigned int size ; /*size of this node*/
unsigned short major_version ; /*API major version.*/
unsigned short minor_version ; /*API minor version.*/
} _Tinfo_Node ;
/* KeyMgr 3.x is the first one supporting GCC3 stuff natively. */
#define KEYMGR_API_MAJOR_GCC3 3
/* ... with these keys. */
#define KEYMGR_GCC3_LIVE_IMAGE_LIST 301 /* loaded images */
#define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */
/* Node of KEYMGR_GCC3_LIVE_IMAGE_LIST. Info about each resident image. */
struct live_images {
unsigned long this_size; /* sizeof (live_images) */
struct mach_header *mh; /* the image info */
unsigned long vm_slide;
void (*destructor)(struct live_images *); /* destructor for this */
struct live_images *next;
unsigned int examined_p;
void *fde;
void *object_info;
unsigned long info[2]; /* Future use. */
};
/* These routines are used only on Darwin versions before 10.2.
Later versions have equivalent code in the system.
Eventually, they might go away, although it might be a long time... */
static void darwin_unwind_dyld_remove_image_hook
(struct mach_header *m, unsigned long s);
static void darwin_unwind_dyld_remove_image_hook
(struct mach_header *m, unsigned long s);
extern void __darwin_gcc3_preregister_frame_info (void);
static void
darwin_unwind_dyld_add_image_hook (struct mach_header *mh, unsigned long slide)
{
struct live_images *l = (struct live_images *)calloc (1, sizeof (*l));
l->mh = mh;
l->vm_slide = slide;
l->this_size = sizeof (*l);
l->next = (struct live_images *)
_keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST);
_keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, l);
}
static void
darwin_unwind_dyld_remove_image_hook (struct mach_header *m, unsigned long s)
{
struct live_images *top, **lip, *destroy = NULL;
/* Look for it in the list of live images and delete it. */
top = (struct live_images *)
_keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST);
for (lip = ⊤ *lip != NULL; lip = &(*lip)->next)
{
if ((*lip)->mh == m && (*lip)->vm_slide == s)
{
destroy = *lip;
*lip = destroy->next; /* unlink DESTROY */
if (destroy->this_size != sizeof (*destroy)) /* sanity check */
abort ();
break;
}
}
_keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, top);
/* Now that we have unlinked this from the image list, toss it. */
if (destroy != NULL)
{
if (destroy->destructor != NULL)
(*destroy->destructor) (destroy);
free (destroy);
}
}
void
__darwin_gcc3_preregister_frame_info (void)
{
const _Tinfo_Node *info;
_init_keymgr ();
info = (_Tinfo_Node *)__keymgr_global[2];
if (info != NULL)
{
if (info->major_version >= KEYMGR_API_MAJOR_GCC3)
return;
/* Otherwise, use our own add_image_hooks. */
}
_dyld_register_func_for_add_image (darwin_unwind_dyld_add_image_hook);
_dyld_register_func_for_remove_image (darwin_unwind_dyld_remove_image_hook);
}
#endif /* __ppc__ */
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