1 /* Copyright (C) 2003, 2005, 2006, 2009 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Jakub Jelinek <jakub@redhat.com>.
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.
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.
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/>. */
26 #define __libc_dlopen(x) dlopen(x, (RTLD_LOCAL | RTLD_LAZY))
27 #define __libc_dlsym dlsym
28 #define __libc_dlclose dlclose
30 static void *libgcc_s_handle;
31 static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
32 static _Unwind_Reason_Code (*libgcc_s_personality)
33 (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
34 struct _Unwind_Context *);
35 static _Unwind_Reason_Code (*libgcc_s_forcedunwind)
36 (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
37 static _Unwind_Word (*libgcc_s_getcfa) (struct _Unwind_Context *);
40 __attribute_noinline__
41 pthread_cancel_init (void)
49 if (__builtin_expect (libgcc_s_handle != NULL, 1))
51 /* Force gcc to reload all values. */
52 __asm__ __volatile__ ("" ::: "memory");
56 handle = __libc_dlopen (LIBGCC_S_SO);
59 || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
60 || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL
61 || (forcedunwind = __libc_dlsym (handle, "_Unwind_ForcedUnwind"))
63 || (getcfa = __libc_dlsym (handle, "_Unwind_GetCFA")) == NULL
64 #ifdef ARCH_CANCEL_INIT
65 || ARCH_CANCEL_INIT (handle)
69 printf (LIBGCC_S_SO " must be installed for pthread_cancel to work\n");
74 libgcc_s_resume = resume;
75 PTR_MANGLE (personality);
76 libgcc_s_personality = personality;
77 PTR_MANGLE (forcedunwind);
78 libgcc_s_forcedunwind = forcedunwind;
80 libgcc_s_getcfa = getcfa;
81 /* Make sure libgcc_s_handle is written last. Otherwise,
82 pthread_cancel_init might return early even when the pointer the
83 caller is interested in is not initialized yet. */
84 atomic_write_barrier ();
85 libgcc_s_handle = handle;
89 __libc_freeres_fn_section
90 __unwind_freeres (void)
92 void *handle = libgcc_s_handle;
95 libgcc_s_handle = NULL;
96 __libc_dlclose (handle);
101 _Unwind_Resume (struct _Unwind_Exception *exc)
103 if (__builtin_expect (libgcc_s_handle == NULL, 0))
104 pthread_cancel_init ();
106 void (*resume) (struct _Unwind_Exception *exc) = libgcc_s_resume;
107 PTR_DEMANGLE (resume);
112 __gcc_personality_v0 (int version, _Unwind_Action actions,
113 _Unwind_Exception_Class exception_class,
114 struct _Unwind_Exception *ue_header,
115 struct _Unwind_Context *context);
117 __gcc_personality_v0 (int version, _Unwind_Action actions,
118 _Unwind_Exception_Class exception_class,
119 struct _Unwind_Exception *ue_header,
120 struct _Unwind_Context *context)
122 if (__builtin_expect (libgcc_s_handle == NULL, 0))
123 pthread_cancel_init ();
125 _Unwind_Reason_Code (*personality)
126 (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
127 struct _Unwind_Context *) = libgcc_s_personality;
128 PTR_DEMANGLE (personality);
129 return personality (version, actions, exception_class, ue_header, context);
133 _Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop,
136 if (__builtin_expect (libgcc_s_handle == NULL, 0))
137 pthread_cancel_init ();
139 _Unwind_Reason_Code (*forcedunwind)
140 (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *)
141 = libgcc_s_forcedunwind;
142 PTR_DEMANGLE (forcedunwind);
143 return forcedunwind (exc, stop, stop_argument);
147 _Unwind_GetCFA (struct _Unwind_Context *context)
149 if (__builtin_expect (libgcc_s_handle == NULL, 0))
150 pthread_cancel_init ();
152 _Unwind_Word (*getcfa) (struct _Unwind_Context *) = libgcc_s_getcfa;
153 PTR_DEMANGLE (getcfa);
154 return getcfa (context);