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/* Pointer obfuscation implenentation. LoongArch version.
Copyright (C) 2022-2023 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
/* Load a got-relative EXPR into G, using T.
Note G and T are register names. */
#define LD_GLOBAL(G, EXPR) \
la.global G, EXPR; \
REG_L G, G, 0;
/* Load a pc-relative EXPR into G, using T.
Note G and T are register names. */
#define LD_PCREL(G, EXPR) \
la.pcrel G, EXPR; \
REG_L G, G, 0;
#if (IS_IN (rtld) \
|| (!defined SHARED && (IS_IN (libc) \
|| IS_IN (libpthread))))
#ifdef __ASSEMBLER__
#define PTR_MANGLE(dst, src, guard) \
LD_PCREL (guard, __pointer_chk_guard_local); \
PTR_MANGLE2 (dst, src, guard);
#define PTR_DEMANGLE(dst, src, guard) \
LD_PCREL (guard, __pointer_chk_guard_local); \
PTR_DEMANGLE2 (dst, src, guard);
/* Use PTR_MANGLE2 for efficiency if guard is already loaded. */
#define PTR_MANGLE2(dst, src, guard) \
xor dst, src, guard;
#define PTR_DEMANGLE2(dst, src, guard) \
PTR_MANGLE2 (dst, src, guard);
#else
# include <stdint.h>
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(dst, src, guard) \
LD_GLOBAL (guard, __pointer_chk_guard); \
PTR_MANGLE2 (dst, src, guard);
#define PTR_DEMANGLE(dst, src, guard) \
LD_GLOBAL (guard, __pointer_chk_guard); \
PTR_DEMANGLE2 (dst, src, guard);
/* Use PTR_MANGLE2 for efficiency if guard is already loaded. */
#define PTR_MANGLE2(dst, src, guard) \
xor dst, src, guard;
#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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