1/* ABI compatibility for 'longjmp' and 'siglongjmp' symbols in libpthread ABI.
2 Copyright (C) 2002-2016 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
35static __typeof (longjmp) *
36__attribute__ ((used))
37longjmp_resolve (void)
38{
39 return &__libc_longjmp;
40}
41
42# ifdef HAVE_ASM_SET_DIRECTIVE
43# define DEFINE_LONGJMP(name) \
44 asm (".set " #name ", longjmp_resolve\n" \
45 ".globl " #name "\n" \
46 ".type " #name ", %gnu_indirect_function");
47# else
48# define DEFINE_LONGJMP(name) \
49 asm (#name " = longjmp_resolve\n" \
50 ".globl " #name "\n" \
51 ".type " #name ", %gnu_indirect_function");
52# endif
53
54# else /* !HAVE_IFUNC */
55
56static void __attribute__ ((noreturn, used))
57longjmp_compat (jmp_buf env, int val)
58{
59 __libc_longjmp (env, val);
60}
61
62# define DEFINE_LONGJMP(name) strong_alias (longjmp_compat, name)
63
64# endif /* HAVE_IFUNC */
65
66DEFINE_LONGJMP (longjmp_ifunc)
67compat_symbol (libpthread, longjmp_ifunc, longjmp, GLIBC_2_0);
68
69DEFINE_LONGJMP (siglongjmp_ifunc)
70compat_symbol (libpthread, siglongjmp_ifunc, siglongjmp, GLIBC_2_0);
71
72#endif
73