diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/alpha/pointer_guard.h')
-rw-r--r-- | sysdeps/unix/sysv/linux/alpha/pointer_guard.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/alpha/pointer_guard.h b/sysdeps/unix/sysv/linux/alpha/pointer_guard.h new file mode 100644 index 0000000000..d4d513d816 --- /dev/null +++ b/sysdeps/unix/sysv/linux/alpha/pointer_guard.h @@ -0,0 +1,62 @@ +/* Pointer guard implementation. Alpha version. + Copyright (C) 2006-2022 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 */ |