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 #define __libc_dlopen(x) dlopen(x, (RTLD_LOCAL | RTLD_LAZY))
28 #define __libc_dlsym dlsym
29 #define __libc_dlclose dlclose
31 static void *libgcc_s_handle;
32 static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
33 static _Unwind_Reason_Code (*libgcc_s_personality)
34 (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
35 struct _Unwind_Context *);
36 static _Unwind_Reason_Code (*libgcc_s_forcedunwind)
37 (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
38 static _Unwind_Word (*libgcc_s_getcfa) (struct _Unwind_Context *);
41 __attribute_noinline__
42 pthread_cancel_init (void)
50 if (__builtin_expect (libgcc_s_handle != NULL, 1))
52 /* Force gcc to reload all values. */
53 __asm__ __volatile__ ("" ::: "memory");
57 handle = __libc_dlopen (LIBGCC_S_SO);
60 || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
61 || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL
62 || (forcedunwind = __libc_dlsym (handle, "_Unwind_ForcedUnwind"))
64 || (getcfa = __libc_dlsym (handle, "_Unwind_GetCFA")) == NULL
65 #ifdef ARCH_CANCEL_INIT
66 || ARCH_CANCEL_INIT (handle)
70 printf (LIBGCC_S_SO " must be installed for pthread_cancel to work\n");
75 libgcc_s_resume = resume;
76 PTR_MANGLE (personality);
77 libgcc_s_personality = personality;
78 PTR_MANGLE (forcedunwind);
79 libgcc_s_forcedunwind = forcedunwind;
81 libgcc_s_getcfa = getcfa;
82 /* Make sure libgcc_s_handle is written last. Otherwise,
83 pthread_cancel_init might return early even when the pointer the
84 caller is interested in is not initialized yet. */
85 atomic_write_barrier ();
86 libgcc_s_handle = handle;
90 __libc_freeres_fn_section
91 __unwind_freeres (void)
93 void *handle = libgcc_s_handle;
96 libgcc_s_handle = NULL;
97 __libc_dlclose (handle);
102 _Unwind_Resume (struct _Unwind_Exception *exc)
104 if (__builtin_expect (libgcc_s_handle == NULL, 0))
105 pthread_cancel_init ();
107 void (*resume) (struct _Unwind_Exception *exc) = libgcc_s_resume;
108 PTR_DEMANGLE (resume);
113 __gcc_personality_v0 (int version, _Unwind_Action actions,
114 _Unwind_Exception_Class exception_class,
115 struct _Unwind_Exception *ue_header,
116 struct _Unwind_Context *context)
118 if (__builtin_expect (libgcc_s_handle == NULL, 0))
119 pthread_cancel_init ();
121 _Unwind_Reason_Code (*personality)
122 (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
123 struct _Unwind_Context *) = libgcc_s_personality;
124 PTR_DEMANGLE (personality);
125 return personality (version, actions, exception_class, ue_header, context);
129 _Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop,
132 if (__builtin_expect (libgcc_s_handle == NULL, 0))
133 pthread_cancel_init ();
135 _Unwind_Reason_Code (*forcedunwind)
136 (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *)
137 = libgcc_s_forcedunwind;
138 PTR_DEMANGLE (forcedunwind);
139 return forcedunwind (exc, stop, stop_argument);
143 _Unwind_GetCFA (struct _Unwind_Context *context)
145 if (__builtin_expect (libgcc_s_handle == NULL, 0))
146 pthread_cancel_init ();
148 _Unwind_Word (*getcfa) (struct _Unwind_Context *) = libgcc_s_getcfa;
149 PTR_DEMANGLE (getcfa);
150 return getcfa (context);