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44 lines
1.7 KiB
C
44 lines
1.7 KiB
C
/* Pointer obfuscation implenentation. Generic (no-op) version.
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Copyright (C) 2005-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef POINTER_GUARD_H
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#define POINTER_GUARD_H
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#if IS_IN (rtld)
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/* We cannot use the thread descriptor because in ld.so we use setjmp
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earlier than the descriptor is initialized. Using a global variable
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is too complicated here since we have no PC-relative addressing mode. */
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# include <sysdeps/generic/pointer_guard.h>
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#else
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# ifdef __ASSEMBLER__
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# define PTR_MANGLE(reg, tmp) \
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stc gbr,tmp; mov.l @(POINTER_GUARD,tmp),tmp; xor tmp,reg
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# define PTR_MANGLE2(reg, tmp) xor tmp,reg
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# define PTR_DEMANGLE(reg, tmp) PTR_MANGLE (reg, tmp)
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# define PTR_DEMANGLE2(reg, tmp) PTR_MANGLE2 (reg, tmp)
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# else
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# include <stdint.h>
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# include <tls.h>
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# define PTR_MANGLE(var) \
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(var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
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# define PTR_DEMANGLE(var) PTR_MANGLE (var)
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# endif
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#endif
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#endif /* POINTER_GUARD_H */
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