1/* Definition of __INDIRECT_RETURN.  AArch64 version.
 2   Copyright (C) 2024-2025 Free Software Foundation, Inc.
 3   This file is part of the GNU C Library.
 4
 5   The GNU C Library is free software; you can redistribute it and/or
 6   modify it under the terms of the GNU Lesser General Public
 7   License as published by the Free Software Foundation; either
 8   version 2.1 of the License, or (at your option) any later version.
 9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#ifndef _UCONTEXT_H
20# error "Never include <bits/indirect-return.h> directly; use <ucontext.h> instead."
21#endif
22
23/* __INDIRECT_RETURN indicates that swapcontext may return via
24   an indirect branch.  This happens when GCS is enabled, so
25   add the attribute if available, otherwise returns_twice has
26   a similar effect, but it prevents some code transformations
27   that can cause build failures in some rare cases so it is
28   only used when GCS is enabled.  */
29#if __glibc_has_attribute (__indirect_return__)
30# define __INDIRECT_RETURN __attribute__ ((__indirect_return__))
31#elif __glibc_has_attribute (__returns_twice__) \
32      && defined __ARM_FEATURE_GCS_DEFAULT
33# define __INDIRECT_RETURN __attribute__ ((__returns_twice__))
34#else
35# define __INDIRECT_RETURN
36#endif