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 not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
27 static void *libgcc_s_handle;
28 static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
29 static _Unwind_Reason_Code (*libgcc_s_personality)
30 (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
31 struct _Unwind_Context *);
32 static _Unwind_Reason_Code (*libgcc_s_forcedunwind)
33 (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
34 static _Unwind_Word (*libgcc_s_getcfa) (struct _Unwind_Context *);
37 __attribute_noinline__
38 pthread_cancel_init (void)
46 if (__builtin_expect (libgcc_s_handle != NULL, 1))
48 /* Force gcc to reload all values. */
49 __asm__ volatile ("" ::: "memory");
53 handle = __libc_dlopen (LIBGCC_S_SO);
56 || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
57 || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL
58 || (forcedunwind = __libc_dlsym (handle, "_Unwind_ForcedUnwind"))
60 || (getcfa = __libc_dlsym (handle, "_Unwind_GetCFA")) == NULL
61 #ifdef ARCH_CANCEL_INIT
62 || ARCH_CANCEL_INIT (handle)
66 printf (LIBGCC_S_SO " must be installed for pthread_cancel to work\n");
71 libgcc_s_resume = resume;
72 PTR_MANGLE (personality);
73 libgcc_s_personality = personality;
74 PTR_MANGLE (forcedunwind);
75 libgcc_s_forcedunwind = forcedunwind;
77 libgcc_s_getcfa = getcfa;
78 /* Make sure libgcc_s_handle is written last. Otherwise,
79 pthread_cancel_init might return early even when the pointer the
80 caller is interested in is not initialized yet. */
81 atomic_write_barrier ();
82 libgcc_s_handle = handle;
86 __libc_freeres_fn_section
87 __unwind_freeres (void)
89 void *handle = libgcc_s_handle;
92 libgcc_s_handle = NULL;
93 __libc_dlclose (handle);
98 _Unwind_Resume (struct _Unwind_Exception *exc)
100 if (__builtin_expect (libgcc_s_handle == NULL, 0))
101 pthread_cancel_init ();
103 void (*resume) (struct _Unwind_Exception *exc) = libgcc_s_resume;
104 PTR_DEMANGLE (resume);
109 __gcc_personality_v0 (int version, _Unwind_Action actions,
110 _Unwind_Exception_Class exception_class,
111 struct _Unwind_Exception *ue_header,
112 struct _Unwind_Context *context)
114 if (__builtin_expect (libgcc_s_handle == NULL, 0))
115 pthread_cancel_init ();
117 _Unwind_Reason_Code (*personality)
118 (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
119 struct _Unwind_Context *) = libgcc_s_personality;
120 PTR_DEMANGLE (personality);
121 return personality (version, actions, exception_class, ue_header, context);
125 _Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop,
128 if (__builtin_expect (libgcc_s_handle == NULL, 0))
129 pthread_cancel_init ();
131 _Unwind_Reason_Code (*forcedunwind)
132 (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *)
133 = libgcc_s_forcedunwind;
134 PTR_DEMANGLE (forcedunwind);
135 return forcedunwind (exc, stop, stop_argument);
139 _Unwind_GetCFA (struct _Unwind_Context *context)
141 if (__builtin_expect (libgcc_s_handle == NULL, 0))
142 pthread_cancel_init ();
144 _Unwind_Word (*getcfa) (struct _Unwind_Context *) = libgcc_s_getcfa;
145 PTR_DEMANGLE (getcfa);
146 return getcfa (context);