Current File : //proc/thread-self/root/usr/include/bits/indirect-return.h
/* 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
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