1 | /* ABI compatibility for 'longjmp' and 'siglongjmp' symbols in libpthread ABI. |
2 | Copyright (C) 2002-2018 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. |
29 | |
30 | With an IFUNC resolver, it would be possible to avoid the indirection, |
31 | but the IFUNC resolver might run before the __libc_longjmp symbol has |
32 | been relocated, in which case the IFUNC resolver would not be able to |
33 | provide the correct address. */ |
34 | |
35 | #if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22) |
36 | |
37 | static void __attribute__ ((noreturn, used)) |
38 | longjmp_compat (jmp_buf env, int val) |
39 | { |
40 | __libc_longjmp (env, val); |
41 | } |
42 | |
43 | strong_alias (longjmp_compat, longjmp_alias) |
44 | compat_symbol (libpthread, longjmp_alias, longjmp, GLIBC_2_0); |
45 | |
46 | strong_alias (longjmp_alias, siglongjmp_alias) |
47 | compat_symbol (libpthread, siglongjmp_alias, siglongjmp, GLIBC_2_0); |
48 | |
49 | #endif |
50 | |