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- /* Pointer guard implementation. Arm version.
- Copyright (C) 2013-2026 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. */
- #if (IS_IN (rtld) \
- || (!defined SHARED && (IS_IN (libc) || IS_IN (libpthread))))
- # ifdef __ASSEMBLER__
- # define PTR_MANGLE_LOAD(guard, tmp) \
- LDR_HIDDEN (guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard_local), 0)
- # define PTR_MANGLE(dst, src, guard, tmp) \
- PTR_MANGLE_LOAD(guard, tmp); \
- PTR_MANGLE2(dst, src, guard)
- /* Use PTR_MANGLE2 for efficiency if guard is already loaded. */
- # define PTR_MANGLE2(dst, src, guard) \
- eor dst, src, guard
- # define PTR_DEMANGLE(dst, src, guard, tmp) \
- PTR_MANGLE (dst, src, guard, tmp)
- # define PTR_DEMANGLE2(dst, src, guard) \
- PTR_MANGLE2 (dst, src, guard)
- # else
- 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)
- # define PTR_DEMANGLE(var) PTR_MANGLE (var)
- # endif
- #else
- # ifdef __ASSEMBLER__
- # define PTR_MANGLE_LOAD(guard, tmp) \
- LDR_GLOBAL (guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard), 0);
- # define PTR_MANGLE(dst, src, guard, tmp) \
- PTR_MANGLE_LOAD(guard, tmp); \
- PTR_MANGLE2(dst, src, guard)
- /* Use PTR_MANGLE2 for efficiency if guard is already loaded. */
- # define PTR_MANGLE2(dst, src, guard) \
- eor dst, src, guard
- # define PTR_DEMANGLE(dst, src, guard, tmp) \
- PTR_MANGLE (dst, src, guard, tmp)
- # define PTR_DEMANGLE2(dst, src, guard) \
- PTR_MANGLE2 (dst, src, guard)
- # else
- # include <stdint.h>
- extern uintptr_t __pointer_chk_guard attribute_relro;
- # define PTR_MANGLE(var) \
- (var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard)
- # define PTR_DEMANGLE(var) PTR_MANGLE (var)
- # endif
- #endif
- #endif /* POINTER_GUARD_H */
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