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

1 files changed, 60 insertions, 0 deletions

diff --git a/backends/x86_64_cfi.c b/backends/x86_64_cfi.c
new file mode 100644
index 00000000..caaee44e
--- /dev/null
+++ b/backends/x86_64_cfi.c
@@ -0,0 +1,60 @@
+/* x86-64 ABI-specified defaults for DWARF CFI.
+   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.
+
+   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>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <dwarf.h>
+
+#define BACKEND x86_64_
+#include "libebl_CPU.h"
+
+int
+x86_64_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info)
+{
+  static const uint8_t abi_cfi[] =
+    {
+      /* Call-saved regs.  */
+      DW_CFA_same_value, ULEB128_7 (0), /* %rbx */
+      DW_CFA_same_value, ULEB128_7 (6), /* %rbp */
+      DW_CFA_same_value, ULEB128_7 (12), /* %r12 */
+      DW_CFA_same_value, ULEB128_7 (13), /* %r13 */
+      DW_CFA_same_value, ULEB128_7 (14), /* %r14 */
+      DW_CFA_same_value, ULEB128_7 (15), /* %r15 */
+      DW_CFA_same_value, ULEB128_7 (16), /* %r16 */
+
+      /* The CFA is the SP.  */
+      DW_CFA_val_offset, ULEB128_7 (7), ULEB128_7 (0),
+    };
+
+  abi_info->initial_instructions = abi_cfi;
+  abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi];
+  abi_info->data_alignment_factor = 8;
+
+  abi_info->return_address_register = 16; /* %rip */
+
+  return 0;
+}