1 files changed, 151 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c b/libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c
new file mode 100644
index 000000000..273c8bb3f
--- /dev/null
+++ b/libpthread/nptl/sysdeps/pthread/unwind-forcedunwind.c
@@ -0,0 +1,151 @@
+/* Copyright (C) 2003, 2005, 2006, 2009 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <dlfcn.h>
+#include <stdio.h>
+#include <unwind.h>
+#include <pthreadP.h>
+#include <sysdep.h>
+#include <libgcc_s.h>
+
+#define __libc_dlopen(x)        dlopen(x, (RTLD_LOCAL | RTLD_LAZY))
+#define __libc_dlsym            dlsym
+#define __libc_dlclose		dlclose
+
+static void *libgcc_s_handle;
+static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
+static _Unwind_Reason_Code (*libgcc_s_personality)
+  (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
+   struct _Unwind_Context *);
+static _Unwind_Reason_Code (*libgcc_s_forcedunwind)
+  (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
+static _Unwind_Word (*libgcc_s_getcfa) (struct _Unwind_Context *);
+
+void
+__attribute_noinline__
+pthread_cancel_init (void)
+{
+  void *resume;
+  void *personality;
+  void *forcedunwind;
+  void *getcfa;
+  void *handle;
+
+  if (__builtin_expect (libgcc_s_handle != NULL, 1))
+    {
+      /* Force gcc to reload all values.  */
+      __asm__ volatile ("" ::: "memory");
+      return;
+    }
+
+  handle = __libc_dlopen (LIBGCC_S_SO);
+
+  if (handle == NULL
+      || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
+      || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL
+      || (forcedunwind = __libc_dlsym (handle, "_Unwind_ForcedUnwind"))
+	 == NULL
+      || (getcfa = __libc_dlsym (handle, "_Unwind_GetCFA")) == NULL
+#ifdef ARCH_CANCEL_INIT
+      || ARCH_CANCEL_INIT (handle)
+#endif
+      )
+  {
+    printf (LIBGCC_S_SO " must be installed for pthread_cancel to work\n");
+    abort();
+  }
+
+  PTR_MANGLE (resume);
+  libgcc_s_resume = resume;
+  PTR_MANGLE (personality);
+  libgcc_s_personality = personality;
+  PTR_MANGLE (forcedunwind);
+  libgcc_s_forcedunwind = forcedunwind;
+  PTR_MANGLE (getcfa);
+  libgcc_s_getcfa = getcfa;
+  /* Make sure libgcc_s_handle is written last.  Otherwise,
+     pthread_cancel_init might return early even when the pointer the
+     caller is interested in is not initialized yet.  */
+  atomic_write_barrier ();
+  libgcc_s_handle = handle;
+}
+
+void
+__libc_freeres_fn_section
+__unwind_freeres (void)
+{
+  void *handle = libgcc_s_handle;
+  if (handle != NULL)
+    {
+      libgcc_s_handle = NULL;
+      __libc_dlclose (handle);
+    }
+}
+
+void
+_Unwind_Resume (struct _Unwind_Exception *exc)
+{
+  if (__builtin_expect (libgcc_s_handle == NULL, 0))
+    pthread_cancel_init ();
+
+  void (*resume) (struct _Unwind_Exception *exc) = libgcc_s_resume;
+  PTR_DEMANGLE (resume);
+  resume (exc);
+}
+
+_Unwind_Reason_Code
+__gcc_personality_v0 (int version, _Unwind_Action actions,
+		      _Unwind_Exception_Class exception_class,
+                      struct _Unwind_Exception *ue_header,
+                      struct _Unwind_Context *context)
+{
+  if (__builtin_expect (libgcc_s_handle == NULL, 0))
+    pthread_cancel_init ();
+
+  _Unwind_Reason_Code (*personality)
+    (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
+     struct _Unwind_Context *) = libgcc_s_personality;
+  PTR_DEMANGLE (personality);
+  return personality (version, actions, exception_class, ue_header, context);
+}
+
+_Unwind_Reason_Code
+_Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop,
+		      void *stop_argument)
+{
+  if (__builtin_expect (libgcc_s_handle == NULL, 0))
+    pthread_cancel_init ();
+
+  _Unwind_Reason_Code (*forcedunwind)
+    (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *)
+    = libgcc_s_forcedunwind;
+  PTR_DEMANGLE (forcedunwind);
+  return forcedunwind (exc, stop, stop_argument);
+}
+
+_Unwind_Word
+_Unwind_GetCFA (struct _Unwind_Context *context)
+{
+  if (__builtin_expect (libgcc_s_handle == NULL, 0))
+    pthread_cancel_init ();
+
+  _Unwind_Word (*getcfa) (struct _Unwind_Context *) = libgcc_s_getcfa;
+  PTR_DEMANGLE (getcfa);
+  return getcfa (context);
+}