1 /* Copyright (C) 2003-2014 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/>. */
24 #include <gnu/lib-names.h>
26 static void *libgcc_s_handle
;
27 static void (*libgcc_s_resume
) (struct _Unwind_Exception
*exc
);
28 static _Unwind_Reason_Code (*libgcc_s_personality
)
29 (int, _Unwind_Action
, _Unwind_Exception_Class
, struct _Unwind_Exception
*,
30 struct _Unwind_Context
*);
31 static _Unwind_Reason_Code (*libgcc_s_forcedunwind
)
32 (struct _Unwind_Exception
*, _Unwind_Stop_Fn
, void *);
33 static _Unwind_Word (*libgcc_s_getcfa
) (struct _Unwind_Context
*);
36 __attribute_noinline__
37 pthread_cancel_init (void)
45 if (__builtin_expect (libgcc_s_handle
!= NULL
, 1))
47 /* Force gcc to reload all values. */
48 asm volatile ("" ::: "memory");
52 handle
= __libc_dlopen (LIBGCC_S_SO
);
55 || (resume
= __libc_dlsym (handle
, "_Unwind_Resume")) == NULL
56 || (personality
= __libc_dlsym (handle
, "__gcc_personality_v0")) == NULL
57 || (forcedunwind
= __libc_dlsym (handle
, "_Unwind_ForcedUnwind"))
59 || (getcfa
= __libc_dlsym (handle
, "_Unwind_GetCFA")) == NULL
60 #ifdef ARCH_CANCEL_INIT
61 || ARCH_CANCEL_INIT (handle
)
64 __libc_fatal (LIBGCC_S_SO
" must be installed for pthread_cancel to work\n");
67 libgcc_s_resume
= resume
;
68 PTR_MANGLE (personality
);
69 libgcc_s_personality
= personality
;
70 PTR_MANGLE (forcedunwind
);
71 libgcc_s_forcedunwind
= forcedunwind
;
73 libgcc_s_getcfa
= getcfa
;
74 /* Make sure libgcc_s_handle is written last. Otherwise,
75 pthread_cancel_init might return early even when the pointer the
76 caller is interested in is not initialized yet. */
77 atomic_write_barrier ();
78 libgcc_s_handle
= handle
;
82 __libc_freeres_fn_section
83 __unwind_freeres (void)
85 void *handle
= libgcc_s_handle
;
88 libgcc_s_handle
= NULL
;
89 __libc_dlclose (handle
);
94 _Unwind_Resume (struct _Unwind_Exception
*exc
)
96 if (__builtin_expect (libgcc_s_handle
== NULL
, 0))
97 pthread_cancel_init ();
99 atomic_read_barrier ();
101 void (*resume
) (struct _Unwind_Exception
*exc
) = libgcc_s_resume
;
102 PTR_DEMANGLE (resume
);
107 __gcc_personality_v0 (int version
, _Unwind_Action actions
,
108 _Unwind_Exception_Class exception_class
,
109 struct _Unwind_Exception
*ue_header
,
110 struct _Unwind_Context
*context
)
112 if (__builtin_expect (libgcc_s_handle
== NULL
, 0))
113 pthread_cancel_init ();
115 atomic_read_barrier ();
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 atomic_read_barrier ();
133 _Unwind_Reason_Code (*forcedunwind
)
134 (struct _Unwind_Exception
*, _Unwind_Stop_Fn
, void *)
135 = libgcc_s_forcedunwind
;
136 PTR_DEMANGLE (forcedunwind
);
137 return forcedunwind (exc
, stop
, stop_argument
);
141 _Unwind_GetCFA (struct _Unwind_Context
*context
)
143 if (__builtin_expect (libgcc_s_handle
== NULL
, 0))
144 pthread_cancel_init ();
146 atomic_read_barrier ();
148 _Unwind_Word (*getcfa
) (struct _Unwind_Context
*) = libgcc_s_getcfa
;
149 PTR_DEMANGLE (getcfa
);
150 return getcfa (context
);