mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 05:40:06 +00:00
50 lines
2.3 KiB
C
50 lines
2.3 KiB
C
/* Pointer obfuscation implenentation. i386 version.
|
|
Copyright (C) 2005-2023 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
|
|
|
|
#include <tcb-offsets.h>
|
|
|
|
#if IS_IN (rtld)
|
|
/* We cannot use the thread descriptor because in ld.so we use setjmp
|
|
earlier than the descriptor is initialized. Using a global variable
|
|
is too complicated here since we have no PC-relative addressing mode. */
|
|
# include <sysdeps/generic/pointer_guard.h>
|
|
#else
|
|
# ifdef __ASSEMBLER__
|
|
# define PTR_MANGLE(reg) xorl %gs:POINTER_GUARD, reg; \
|
|
roll $9, reg
|
|
# define PTR_DEMANGLE(reg) rorl $9, reg; \
|
|
xorl %gs:POINTER_GUARD, reg
|
|
# else
|
|
# define PTR_MANGLE(var) asm ("xorl %%gs:%c2, %0\n" \
|
|
"roll $9, %0" \
|
|
: "=r" (var) \
|
|
: "0" (var), \
|
|
"i" (POINTER_GUARD))
|
|
# define PTR_DEMANGLE(var) asm ("rorl $9, %0\n" \
|
|
"xorl %%gs:%c2, %0" \
|
|
: "=r" (var) \
|
|
: "0" (var), \
|
|
"i" (POINTER_GUARD))
|
|
# endif
|
|
#endif
|
|
|
|
#endif /* POINTER_GUARD_H */
|