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 | |
35 | static __typeof (longjmp) * |
36 | __attribute__ ((used)) |
37 | longjmp_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 | |
56 | static void __attribute__ ((noreturn, used)) |
57 | longjmp_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 | |
66 | DEFINE_LONGJMP (longjmp_ifunc) |
67 | compat_symbol (libpthread, longjmp_ifunc, longjmp, GLIBC_2_0); |
68 | |
69 | DEFINE_LONGJMP (siglongjmp_ifunc) |
70 | compat_symbol (libpthread, siglongjmp_ifunc, siglongjmp, GLIBC_2_0); |
71 | |
72 | #endif |
73 | |