1 files changed, 112 insertions, 0 deletions
diff --git a/nptl/unwind.c b/nptl/unwind.c
new file mode 100644
index 0000000000..46c896d5b3
--- /dev/null
+++ b/nptl/unwind.c
@@ -0,0 +1,112 @@
+/* Copyright (C) 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>
+   and Richard Henderson <rth@redhat.com>, 2003.
+
+   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; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <setjmp.h>
+#include <stdlib.h>
+#include "pthreadP.h"
+
+
+#ifdef HAVE_FORCED_UNWIND
+
+static _Unwind_Reason_Code
+unwind_stop (int version, _Unwind_Action actions,
+	     _Unwind_Exception_Class exc_class,
+	     struct _Unwind_Exception *exc_obj,
+	     struct _Unwind_Context *context, void *stop_parameter)
+{
+  struct pthread_unwind_buf *buf = stop_parameter;
+
+  /* Do longjmp if we're at "end of stack", aka "end of unwind data".
+     We assume there are only C frame without unwind data in between
+     here and the jmp_buf target.  Otherwise simply note that the CFA
+     of a function is NOT within it's stack frame; it's the SP of the
+     previous frame.  */
+  if ((actions & _UA_END_OF_STACK)
+      || ! _JMPBUF_UNWINDS  (buf->cancel_jmp_buf[0].jmp_buf,
+			     _Unwind_GetCFA (context)))
+    __libc_longjmp ((struct __jmp_buf_tag *) buf->cancel_jmp_buf, 1);
+
+  return _URC_NO_REASON;
+}
+
+
+static void
+unwind_cleanup (_Unwind_Reason_Code reason, struct _Unwind_Exception *exc)
+{
+  /* Nothing to do.  */
+}
+
+#endif	/* have forced unwind */
+
+
+void
+__cleanup_fct_attribute __attribute ((noreturn))
+__pthread_unwind (__pthread_unwind_buf_t *buf)
+{
+  struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
+  struct pthread *self = THREAD_SELF;
+
+  /* Handle the compatibility stuff first.  Execute all handlers
+     registered with the old method.  We don't execute them in order,
+     instead, they will run first.  */
+  struct _pthread_cleanup_buffer *oldp = ibuf->priv.data.cleanup;
+  struct _pthread_cleanup_buffer *curp = THREAD_GETMEM (self, cleanup);
+
+  while (curp != oldp)
+    {
+      /* Pointer to the next element.  */
+      struct _pthread_cleanup_buffer *nextp = curp->__prev;
+
+      /* Call the handler.  */
+      curp->__routine (curp->__arg);
+
+      /* To the next.  */
+      curp = nextp;
+    }
+
+  /* Mark the current element as handled.  */
+  THREAD_SETMEM (self, cleanup, curp);
+
+#ifdef HAVE_FORCED_UNWIND
+  /* This is not a catchable exception, so don't provide any details about
+     the exception type.  We do need to initialize the field though.  */
+  ibuf->priv.data.exc.exception_class = 0;
+  ibuf->priv.data.exc.exception_cleanup = unwind_cleanup;
+
+  _Unwind_ForcedUnwind (&ibuf->priv.data.exc, unwind_stop, ibuf);
+#else
+  /* We simply jump to the registered setjmp buffer.  */
+  __libc_longjmp ((struct __jmp_buf_tag *) ibuf->cancel_jmp_buf, 1);
+#endif
+  /* NOTREACHED */
+
+  /* We better do not get here.  */
+  abort ();
+}
+
+
+void
+__cleanup_fct_attribute __attribute ((noreturn))
+__pthread_unwind_next (__pthread_unwind_buf_t *buf)
+{
+  struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
+
+  __pthread_unwind (ibuf->priv.data.prev);
+}