1 /* Copyright (C) 2003, 2005, 2006, 2009, 2011 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
)
65 __libc_fatal (LIBGCC_S_SO
" must be installed for pthread_cancel to work\n");
68 libgcc_s_resume
= resume
;
69 PTR_MANGLE (personality
);
70 libgcc_s_personality
= personality
;
71 PTR_MANGLE (forcedunwind
);
72 libgcc_s_forcedunwind
= forcedunwind
;
74 libgcc_s_getcfa
= getcfa
;
75 /* Make sure libgcc_s_handle is written last. Otherwise,
76 pthread_cancel_init might return early even when the pointer the
77 caller is interested in is not initialized yet. */
78 atomic_write_barrier ();
79 libgcc_s_handle
= handle
;
83 __libc_freeres_fn_section
84 __unwind_freeres (void)
86 void *handle
= libgcc_s_handle
;
89 libgcc_s_handle
= NULL
;
90 __libc_dlclose (handle
);
95 _Unwind_Resume (struct _Unwind_Exception
*exc
)
97 if (__builtin_expect (libgcc_s_handle
== NULL
, 0))
98 pthread_cancel_init ();
100 atomic_read_barrier ();
102 void (*resume
) (struct _Unwind_Exception
*exc
) = libgcc_s_resume
;
103 PTR_DEMANGLE (resume
);
108 __gcc_personality_v0 (int version
, _Unwind_Action actions
,
109 _Unwind_Exception_Class exception_class
,
110 struct _Unwind_Exception
*ue_header
,
111 struct _Unwind_Context
*context
)
113 if (__builtin_expect (libgcc_s_handle
== NULL
, 0))
114 pthread_cancel_init ();
116 atomic_read_barrier ();
118 _Unwind_Reason_Code (*personality
)
119 (int, _Unwind_Action
, _Unwind_Exception_Class
, struct _Unwind_Exception
*,
120 struct _Unwind_Context
*) = libgcc_s_personality
;
121 PTR_DEMANGLE (personality
);
122 return personality (version
, actions
, exception_class
, ue_header
, context
);
126 _Unwind_ForcedUnwind (struct _Unwind_Exception
*exc
, _Unwind_Stop_Fn stop
,
129 if (__builtin_expect (libgcc_s_handle
== NULL
, 0))
130 pthread_cancel_init ();
132 atomic_read_barrier ();
134 _Unwind_Reason_Code (*forcedunwind
)
135 (struct _Unwind_Exception
*, _Unwind_Stop_Fn
, void *)
136 = libgcc_s_forcedunwind
;
137 PTR_DEMANGLE (forcedunwind
);
138 return forcedunwind (exc
, stop
, stop_argument
);
142 _Unwind_GetCFA (struct _Unwind_Context
*context
)
144 if (__builtin_expect (libgcc_s_handle
== NULL
, 0))
145 pthread_cancel_init ();
147 atomic_read_barrier ();
149 _Unwind_Word (*getcfa
) (struct _Unwind_Context
*) = libgcc_s_getcfa
;
150 PTR_DEMANGLE (getcfa
);
151 return getcfa (context
);