| 1 | /* Pointer obfuscation implenentation. x86-64 version. |
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| 2 | Copyright (C) 2005-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef POINTER_GUARD_H |
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| 20 | #define POINTER_GUARD_H |
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| 21 | |
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| 22 | #include <x86-lp_size.h> |
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| 23 | #include <tcb-offsets.h> |
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| 24 | |
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| 25 | #if IS_IN (rtld) |
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| 26 | /* We cannot use the thread descriptor because in ld.so we use setjmp |
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| 27 | earlier than the descriptor is initialized. */ |
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| 28 | # ifdef __ASSEMBLER__ |
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| 29 | # define PTR_MANGLE(reg) xor __pointer_chk_guard_local(%rip), reg; \ |
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| 30 | rol $2*LP_SIZE+1, reg |
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| 31 | # define PTR_DEMANGLE(reg) ror $2*LP_SIZE+1, reg; \ |
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| 32 | xor __pointer_chk_guard_local(%rip), reg |
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| 33 | # else |
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| 34 | # define PTR_MANGLE(reg) asm ("xor __pointer_chk_guard_local(%%rip), %0\n" \ |
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| 35 | "rol $2*" LP_SIZE "+1, %0" \ |
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| 36 | : "=r" (reg) : "0" (reg)) |
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| 37 | # define PTR_DEMANGLE(reg) asm ("ror $2*" LP_SIZE "+1, %0\n" \ |
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| 38 | "xor __pointer_chk_guard_local(%%rip), %0" \ |
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| 39 | : "=r" (reg) : "0" (reg)) |
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| 40 | # endif |
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| 41 | #else |
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| 42 | # ifdef __ASSEMBLER__ |
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| 43 | # define PTR_MANGLE(reg) xor %fs:POINTER_GUARD, reg; \ |
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| 44 | rol $2*LP_SIZE+1, reg |
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| 45 | # define PTR_DEMANGLE(reg) ror $2*LP_SIZE+1, reg; \ |
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| 46 | xor %fs:POINTER_GUARD, reg |
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| 47 | # else |
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| 48 | # define PTR_MANGLE(var) asm ("xor %%fs:%c2, %0\n" \ |
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| 49 | "rol $2*" LP_SIZE "+1, %0" \ |
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| 50 | : "=r" (var) \ |
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| 51 | : "0" (var), \ |
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| 52 | "i" (POINTER_GUARD)) |
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| 53 | # define PTR_DEMANGLE(var) asm ("ror $2*" LP_SIZE "+1, %0\n" \ |
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| 54 | "xor %%fs:%c2, %0" \ |
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| 55 | : "=r" (var) \ |
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| 56 | : "0" (var), \ |
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| 57 | "i" (POINTER_GUARD)) |
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| 58 | # endif |
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| 59 | #endif |
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| 60 | |
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| 61 | #endif /* POINTER_GUARD_H */ |
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| 62 | |
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