1/* Copyright (C) 2003-2020 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 <https://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 /* See include/dlfcn.h. Use of __libc_dlopen requires RTLD_NOW. */
39 handle = __libc_dlopen (LIBGCC_S_SO);
40
41 if (handle == NULL
42 || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
43 || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL)
44 __libc_fatal (LIBGCC_S_SO
45 " must be installed for unwinding to work\n");
46
47#ifdef PTR_MANGLE
48 PTR_MANGLE (resume);
49#endif
50 __libgcc_s_resume = resume;
51#ifdef PTR_MANGLE
52 PTR_MANGLE (personality);
53#endif
54 libgcc_s_personality = personality;
55}
56
57#if !HAVE_ARCH_UNWIND_RESUME
58void
59_Unwind_Resume (struct _Unwind_Exception *exc)
60{
61 if (__glibc_unlikely (__libgcc_s_resume == NULL))
62 __libgcc_s_init ();
63
64 __typeof (__libgcc_s_resume) resume = __libgcc_s_resume;
65#ifdef PTR_DEMANGLE
66 PTR_DEMANGLE (resume);
67#endif
68 (*resume) (exc);
69}
70#endif
71
72_Unwind_Reason_Code
73__gcc_personality_v0 PERSONALITY_PROTO
74{
75 if (__glibc_unlikely (libgcc_s_personality == NULL))
76 __libgcc_s_init ();
77
78 __typeof (libgcc_s_personality) personality = libgcc_s_personality;
79#ifdef PTR_DEMANGLE
80 PTR_DEMANGLE (personality);
81#endif
82 return (*personality) PERSONALITY_ARGS;
83}
84