1/* Support code for fibers and multithreading. 2 Copyright (C) 2019-2020 Free Software Foundation, Inc. 3 4This file is part of GCC. 5 6GCC is free software; you can redistribute it and/or modify it under 7the terms of the GNU General Public License as published by the Free 8Software Foundation; either version 3, or (at your option) any later 9version. 10 11GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12WARRANTY; without even the implied warranty of MERCHANTABILITY or 13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14for more details. 15 16Under Section 7 of GPL version 3, you are granted additional 17permissions described in the GCC Runtime Library Exception, version 183.1, as published by the Free Software Foundation. 19 20You should have received a copy of the GNU General Public License and 21a copy of the GCC Runtime Library Exception along with this program; 22see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23<http://www.gnu.org/licenses/>. */ 24 25#if (__linux__ || __FreeBSD__ || __NetBSD__ || __DragonFly__) && __ELF__ 26/* 27 * Mark the resulting object file as not requiring execution permissions on 28 * stack memory. The absence of this section would mark the whole resulting 29 * library as requiring an executable stack, making it impossible to 30 * dynamically load druntime on several Linux platforms where this is 31 * forbidden due to security policies. 32 */ 33 .section .note.GNU-stack,"",%progbits 34#endif 35 36/* Let preprocessor tell us if C symbols have a prefix: __USER_LABEL_PREFIX__ */ 37#ifdef __USER_LABEL_PREFIX__ 38#define __CONCAT2(a, b) a ## b 39#define __CONCAT(a, b) __CONCAT2(a, b) 40#define CSYM(name) __CONCAT(__USER_LABEL_PREFIX__, name) 41#else 42#define CSYM(name) name 43#endif 44