/* Definition of __INDIRECT_RETURN.  x86 version.

   Copyright (C) 2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifndef _UCONTEXT_H

# error "Never include <bits/indirect-return.h> directly; use <ucontext.h> instead."

#endif

/* On x86, swapcontext returns via indirect branch when the shadow stack

   is enabled.  Define __INDIRECT_RETURN to indicate whether swapcontext

   returns via indirect branch.  */

#if defined __CET__ && (__CET__ & 2) != 0

# if __glibc_has_attribute (__indirect_return__)

#  define __INDIRECT_RETURN __attribute__ ((__indirect_return__))

# else

/* Newer compilers provide the indirect_return attribute, but without

   it we can use returns_twice to affect the optimizer in the same

   way and avoid unsafe optimizations.  */

#  define __INDIRECT_RETURN __attribute__ ((__returns_twice__))

# endif

#else

# define __INDIRECT_RETURN

#endif