1 /* __libc_siglongjmp for Linux/x86 2 Copyright (C) 2018-2021 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 #include <sysdeps/x86/longjmp.c> 20 21 #include <pthreadP.h> 22 #include <jmp_buf-ssp.h> 23 24 #ifdef __x86_64__ 25 # define SHADOW_STACK_POINTER_SIZE 8 26 #else 27 # define SHADOW_STACK_POINTER_SIZE 4 28 #endif 29 30 /* Assert that the priv field in struct pthread_unwind_buf has space 31 to store shadow stack pointer. */ 32 _Static_assert ((offsetof (struct pthread_unwind_buf, priv) 33 <= SHADOW_STACK_POINTER_OFFSET) 34 && ((offsetof (struct pthread_unwind_buf, priv) 35 + sizeof (((struct pthread_unwind_buf *) 0)->priv)) 36 >= (SHADOW_STACK_POINTER_OFFSET 37 + SHADOW_STACK_POINTER_SIZE)), 38 "Shadow stack pointer is not within private storage " 39 "of pthread_unwind_buf."); 40