libphobos/libdruntime/config/common/threadasm.S

   1 /* Support code for fibers and multithreading.
   2    Copyright (C) 2019 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see 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