1/* ABI compatibility for 'longjmp' and 'siglongjmp' symbols in libpthread ABI.
2 Copyright (C) 2002-2017 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
19
20#include <setjmp.h>
21#include <shlib-compat.h>
22
23/* libpthread once had its own longjmp (and siglongjmp alias), though there
24 was no apparent reason for it. There is no use in having a separate
25 symbol in libpthread, but the historical ABI requires it. For static
26 linking, there is no need to provide anything here--the libc version
27 will be linked in. For shared library ABI compatibility, there must be
28 longjmp and siglongjmp symbols in libpthread.so; so we define them using
29 IFUNC to redirect to the libc function. */
30
31#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
32
33# if HAVE_IFUNC
34
35# undef INIT_ARCH
36# define INIT_ARCH()
37# define DEFINE_LONGJMP(name) libc_ifunc (name, &__libc_longjmp)
38
39extern __typeof(longjmp) longjmp_ifunc;
40extern __typeof(siglongjmp) siglongjmp_ifunc;
41
42# else /* !HAVE_IFUNC */
43
44static void __attribute__ ((noreturn, used))
45longjmp_compat (jmp_buf env, int val)
46{
47 __libc_longjmp (env, val);
48}
49
50# define DEFINE_LONGJMP(name) strong_alias (longjmp_compat, name)
51
52# endif /* HAVE_IFUNC */
53
54DEFINE_LONGJMP (longjmp_ifunc)
55compat_symbol (libpthread, longjmp_ifunc, longjmp, GLIBC_2_0);
56
57strong_alias (longjmp_ifunc, siglongjmp_ifunc)
58compat_symbol (libpthread, siglongjmp_ifunc, siglongjmp, GLIBC_2_0);
59
60#endif
61