mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
63 lines
2.4 KiB
C
63 lines
2.4 KiB
C
/* Pointer guard implementation. Alpha version.
|
|
Copyright (C) 2006-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library. If not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef POINTER_GUARD_H
|
|
#define POINTER_GUARD_H
|
|
|
|
/* Pointer mangling support. Note that tls access is slow enough that
|
|
we don't deoptimize things by placing the pointer check value there. */
|
|
|
|
#ifdef __ASSEMBLER__
|
|
# if IS_IN (rtld)
|
|
# define PTR_MANGLE(dst, src, tmp) \
|
|
ldah tmp, __pointer_chk_guard_local($29) !gprelhigh; \
|
|
ldq tmp, __pointer_chk_guard_local(tmp) !gprellow; \
|
|
xor src, tmp, dst
|
|
# define PTR_MANGLE2(dst, src, tmp) \
|
|
xor src, tmp, dst
|
|
# elif defined SHARED
|
|
# define PTR_MANGLE(dst, src, tmp) \
|
|
ldq tmp, __pointer_chk_guard; \
|
|
xor src, tmp, dst
|
|
# else
|
|
# define PTR_MANGLE(dst, src, tmp) \
|
|
ldq tmp, __pointer_chk_guard_local; \
|
|
xor src, tmp, dst
|
|
# endif
|
|
# define PTR_MANGLE2(dst, src, tmp) \
|
|
xor src, tmp, dst
|
|
# define PTR_DEMANGLE(dst, tmp) PTR_MANGLE(dst, dst, tmp)
|
|
# define PTR_DEMANGLE2(dst, tmp) PTR_MANGLE2(dst, dst, tmp)
|
|
#else
|
|
# include <stdint.h>
|
|
# if (IS_IN (rtld) \
|
|
|| (!defined SHARED && (IS_IN (libc) \
|
|
|| IS_IN (libpthread))))
|
|
extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden;
|
|
# define PTR_MANGLE(var) \
|
|
(var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local)
|
|
# else
|
|
extern uintptr_t __pointer_chk_guard attribute_relro;
|
|
# define PTR_MANGLE(var) \
|
|
(var) = (__typeof(var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
|
|
# endif
|
|
# define PTR_DEMANGLE(var) PTR_MANGLE(var)
|
|
#endif /* ASSEMBLER */
|
|
|
|
#endif /* POINTER_GUARD_H */
|