1 /* Copyright (C) 2009-2021 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library. If not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #include <signal.h> 19 #include <stdio.h> 20 #define __longjmp ____longjmp_chk 21 #define CHECK_SP(saved_sp, cur_sp, sp_type) \ 22 do { \ 23 sp_type sp_saved = (sp_type) (saved_sp); \ 24 if (sp_saved < (cur_sp)) \ 25 { \ 26 struct __jmp_buf_internal_tag *env_save = env_arg; \ 27 int val_save = val_arg; \ 28 stack_t ss; \ 29 int ret = __sigaltstack (NULL, &ss); \ 30 if (ret == 0 \ 31 && (!(ss.ss_flags & SS_ONSTACK) \ 32 || ((unsigned sp_type) ((sp_type) (long) ss.ss_sp \ 33 + (sp_type) ss.ss_size \ 34 - sp_saved) \ 35 < ss.ss_size))) \ 36 __fortify_fail ("longjmp causes uninitialized stack frame"); \ 37 asm volatile ("move %0, %1" : "=r" (env) : "r" (env_save)); \ 38 asm volatile ("move %0, %1" : "=r" (val) : "r" (val_save)); \ 39 } \ 40 } while (0) 41 #include <__longjmp.c> 42