CFI support: lookup by PC and translate into DWARF location per register

1 files changed, 89 insertions, 0 deletions

diff --git a/libdwfl/dwfl_module_dwarf_cfi.c b/libdwfl/dwfl_module_dwarf_cfi.c
new file mode 100644
index 00000000..b02bfafb
--- /dev/null
+++ b/libdwfl/dwfl_module_dwarf_cfi.c
@@ -0,0 +1,89 @@
+/* Find DWARF CFI for a module in libdwfl.
+   Copyright (C) 2009 Red Hat, Inc.
+   This file is part of Red Hat elfutils.
+
+   Red Hat elfutils is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by the
+   Free Software Foundation; version 2 of the License.
+
+   Red Hat elfutils 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
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with Red Hat elfutils; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
+
+   In addition, as a special exception, Red Hat, Inc. gives You the
+   additional right to link the code of Red Hat elfutils with code licensed
+   under any Open Source Initiative certified open source license
+   (http://www.opensource.org/licenses/index.php) which requires the
+   distribution of source code with any binary distribution and to
+   distribute linked combinations of the two.  Non-GPL Code permitted under
+   this exception must only link to the code of Red Hat elfutils through
+   those well defined interfaces identified in the file named EXCEPTION
+   found in the source code files (the "Approved Interfaces").  The files
+   of Non-GPL Code may instantiate templates or use macros or inline
+   functions from the Approved Interfaces without causing the resulting
+   work to be covered by the GNU General Public License.  Only Red Hat,
+   Inc. may make changes or additions to the list of Approved Interfaces.
+   Red Hat's grant of this exception is conditioned upon your not adding
+   any new exceptions.  If you wish to add a new Approved Interface or
+   exception, please contact Red Hat.  You must obey the GNU General Public
+   License in all respects for all of the Red Hat elfutils code and other
+   code used in conjunction with Red Hat elfutils except the Non-GPL Code
+   covered by this exception.  If you modify this file, you may extend this
+   exception to your version of the file, but you are not obligated to do
+   so.  If you do not wish to provide this exception without modification,
+   you must delete this exception statement from your version and license
+   this file solely under the GPL without exception.
+
+   Red Hat elfutils is an included package of the Open Invention Network.
+   An included package of the Open Invention Network is a package for which
+   Open Invention Network licensees cross-license their patents.  No patent
+   license is granted, either expressly or impliedly, by designation as an
+   included package.  Should you wish to participate in the Open Invention
+   Network licensing program, please visit www.openinventionnetwork.com
+   <http://www.openinventionnetwork.com>.  */
+
+#include "libdwflP.h"
+#include "../libdw/cfi.h"
+
+Dwarf_CFI *
+internal_function
+__libdwfl_set_cfi (Dwfl_Module *mod, Dwarf_CFI **slot, Dwarf_CFI *cfi)
+{
+  if (cfi != NULL && cfi->ebl == NULL)
+    {
+      Dwfl_Error error = __libdwfl_module_getebl (mod);
+      if (error == DWFL_E_NOERROR)
+	cfi->ebl = mod->ebl;
+      else
+	{
+	  if (slot == &mod->eh_cfi)
+	    INTUSE(dwarf_cfi_end) (cfi);
+	  __libdwfl_seterrno (error);
+	  return NULL;
+	}
+    }
+
+  return *slot = cfi;
+}
+
+Dwarf_CFI *
+dwfl_module_dwarf_cfi (mod, bias)
+     Dwfl_Module *mod;
+     Dwarf_Addr *bias;
+{
+  if (mod == NULL)
+    return NULL;
+
+  if (mod->dwarf_cfi != NULL)
+    return mod->dwarf_cfi;
+
+  return __libdwfl_set_cfi (mod, &mod->dwarf_cfi,
+			    INTUSE(dwarf_getcfi)
+			    (INTUSE(dwfl_module_getdwarf) (mod, bias)));
+}
+INTDEF (dwfl_module_dwarf_cfi)