1/* Copyright (C) 2003-2018 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Jakub Jelinek <jakub@redhat.com>.
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 License as
7 published by the Free Software Foundation; either version 2.1 of the
8 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; see the file COPYING.LIB. If
17 not, see <http://www.gnu.org/licenses/>. */
18
19#include <dlfcn.h>
20#include <stdio.h>
21#include <unwind.h>
22#include <gnu/lib-names.h>
23#include <sysdep.h>
24#include <unwind-resume.h>
25
26
27void (*__libgcc_s_resume) (struct _Unwind_Exception *exc)
28 attribute_hidden __attribute__ ((noreturn));
29
30static _Unwind_Reason_Code (*libgcc_s_personality) PERSONALITY_PROTO;
31
32void attribute_hidden __attribute__ ((cold))
33__libgcc_s_init (void)
34{
35 void *resume, *personality;
36 void *handle;
37
38 /* Use RTLD_NOW here for consistency with pthread_cancel_init.
39 RTLD_NOW will rarely make a difference here because unwinding is
40 already in progress, so libgcc_s.so has already been loaded if
41 its unwinder is used. */
42 handle = __libc_dlopen_mode (LIBGCC_S_SO, RTLD_NOW | __RTLD_DLOPEN);
43
44 if (handle == NULL
45 || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
46 || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL)
47 __libc_fatal (LIBGCC_S_SO
48 " must be installed for unwinding to work\n");
49
50#ifdef PTR_MANGLE
51 PTR_MANGLE (resume);
52#endif
53 __libgcc_s_resume = resume;
54#ifdef PTR_MANGLE
55 PTR_MANGLE (personality);
56#endif
57 libgcc_s_personality = personality;
58}
59
60#if !HAVE_ARCH_UNWIND_RESUME
61void
62_Unwind_Resume (struct _Unwind_Exception *exc)
63{
64 if (__glibc_unlikely (__libgcc_s_resume == NULL))
65 __libgcc_s_init ();
66
67 __typeof (__libgcc_s_resume) resume = __libgcc_s_resume;
68#ifdef PTR_DEMANGLE
69 PTR_DEMANGLE (resume);
70#endif
71 (*resume) (exc);
72}
73#endif
74
75_Unwind_Reason_Code
76__gcc_personality_v0 PERSONALITY_PROTO
77{
78 if (__glibc_unlikely (libgcc_s_personality == NULL))
79 __libgcc_s_init ();
80
81 __typeof (libgcc_s_personality) personality = libgcc_s_personality;
82#ifdef PTR_DEMANGLE
83 PTR_DEMANGLE (personality);
84#endif
85 return (*personality) PERSONALITY_ARGS;
86}
87