/* Pointer obfuscation implenentation.  C-SKY version.
   Copyright (C) 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

#if (IS_IN (rtld) \
     || (!defined SHARED && (IS_IN (libc) || IS_IN (libpthread))))
# ifdef __ASSEMBLER__
#  define PTR_MANGLE(dst, src, guard)                   \
        grs     t0, 1f;                                 \
1:                                                      \
        lrw     guard, 1b@GOTPC;                        \
        addu    t0, guard;                              \
        lrw     guard, __pointer_chk_guard_local@GOT;   \
        ldr.w   guard, (t0, guard << 0);                \
        ldw     guard, (guard, 0);                      \
        xor     dst, src, guard;
#  define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard)
#  define PTR_MANGLE2(dst, src, guard) \
        xor     dst, src, guard
#  define PTR_DEMANGLE2(dst, src, guard) PTR_MANGLE2 (dst, src, guard)
# else
extern uintptr_t __pointer_chk_guard_local;
#  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)           \
        grs     t0, 1f;                         \
1:                                              \
        lrw     guard, 1b@GOTPC;                \
        addu    t0, guard;                      \
        lrw     guard, __pointer_chk_guard@GOT; \
        ldr.w   guard, (t0, guard << 0);        \
        ldw     guard, (guard, 0);              \
        xor     dst, src, guard;
#  define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard)
#  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;
#  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 */