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| 1 | /* Pointer obfuscation implenentation. C-SKY version. |
|---|---|
| 2 | Copyright (C) 2022-2024 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef POINTER_GUARD_H |
| 20 | #define POINTER_GUARD_H |
| 21 | |
| 22 | #if (IS_IN (rtld) \ |
| 23 | || (!defined SHARED && (IS_IN (libc) || IS_IN (libpthread)))) |
| 24 | # ifdef __ASSEMBLER__ |
| 25 | # define PTR_MANGLE(dst, src, guard) \ |
| 26 | grs t0, 1f; \ |
| 27 | 1: \ |
| 28 | lrw guard, 1b@GOTPC; \ |
| 29 | addu t0, guard; \ |
| 30 | lrw guard, __pointer_chk_guard_local@GOT; \ |
| 31 | ldr.w guard, (t0, guard << 0); \ |
| 32 | ldw guard, (guard, 0); \ |
| 33 | xor dst, src, guard; |
| 34 | # define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard) |
| 35 | # define PTR_MANGLE2(dst, src, guard) \ |
| 36 | xor dst, src, guard |
| 37 | # define PTR_DEMANGLE2(dst, src, guard) PTR_MANGLE2 (dst, src, guard) |
| 38 | # else |
| 39 | extern uintptr_t __pointer_chk_guard_local; |
| 40 | # define PTR_MANGLE(var) \ |
| 41 | (var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local) |
| 42 | # define PTR_DEMANGLE(var) PTR_MANGLE (var) |
| 43 | # endif |
| 44 | #else |
| 45 | # ifdef __ASSEMBLER__ |
| 46 | # define PTR_MANGLE(dst, src, guard) \ |
| 47 | grs t0, 1f; \ |
| 48 | 1: \ |
| 49 | lrw guard, 1b@GOTPC; \ |
| 50 | addu t0, guard; \ |
| 51 | lrw guard, __pointer_chk_guard@GOT; \ |
| 52 | ldr.w guard, (t0, guard << 0); \ |
| 53 | ldw guard, (guard, 0); \ |
| 54 | xor dst, src, guard; |
| 55 | # define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard) |
| 56 | # define PTR_MANGLE2(dst, src, guard) \ |
| 57 | xor dst, src, guard |
| 58 | # define PTR_DEMANGLE2(dst, src, guard) PTR_MANGLE2 (dst, src, guard) |
| 59 | # else |
| 60 | # include <stdint.h> |
| 61 | extern uintptr_t __pointer_chk_guard; |
| 62 | # define PTR_MANGLE(var) \ |
| 63 | (var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard) |
| 64 | # define PTR_DEMANGLE(var) PTR_MANGLE (var) |
| 65 | # endif |
| 66 | #endif |
| 67 | |
| 68 | #endif /* POINTER_GUARD_H */ |
| 69 |
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