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diff --git a/gdb/arc-inst-tracing.h b/gdb/arc-inst-tracing.h
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+/* Target dependent code for ARC processor family, for GDB, the GNU debugger.
+
+   Copyright 2009 Free Software Foundation, Inc.
+
+   Contributed by ARC International (www.arc.com)
+
+   Authors:
+      Richard Stuckey <richard.stuckey@arc.com>
+
+   This file is part of GDB.
+
+   This program 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; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/******************************************************************************/
+/*                                                                            */
+/* Outline:                                                                   */
+/*     This header file defines operations for recording an instruction trace */
+/*     of successive PC values in a compressed binary format in a file.       */
+/*                                                                            */
+/*     We use the fact that instructions are always 16-bit aligned to encode  */
+/*     17-bit deltas as 16-bit quantities.  We apply a 2-byte bias to the     */
+/*     delta (as the minimum delta could be -2, for a shortest distance       */
+/*     backward branch), so giving us                                         */
+/*                                                                            */
+/*         delta    range:  2 .. 2^17                                         */
+/*         encoding range:  0 .. 2^16 - 1                                     */
+/*                                                                            */
+/*     We could encode positive and negative deltas differently (since the    */
+/*     minimum positive delta is 10, given that 2, 4, 6 and 8 byte positive   */
+/*     deltas are handled diferently), but this hardly seems worthwhile.      */
+/*                                                                            */
+/******************************************************************************/
+
+#ifndef ARC_INSTRUCTION_TRACING_H
+#define ARC_INSTRUCTION_TRACING_H
+
+/* ARC header files */
+#include "arc-support.h"
+
+
+typedef enum
+{
+    NO_CHANGE,
+    PLUS_16_BITS,
+    PLUS_32_BITS,
+    PLUS_48_BITS,
+    PLUS_64_BITS,
+    DELTA_16_BIT_POSITIVE,
+    DELTA_16_BIT_NEGATIVE,
+    ABSOLUTE_31_BITS
+} ARC_ProgramCounterEncoding;
+
+
+typedef unsigned long long Ordinal;
+
+
+#define MAX_DELTA   (1 << 17)
+
+#define ENCODE_DELTA(delta)    (unsigned int) (((delta) - 2) / 2)
+#define DECODE_DELTA(value)                   (((value) * 2) + 2)
+
+
+Boolean arc_start_encoding (const char *filename,
+                            Ordinal     first_instr_count);
+
+void    arc_stop_encoding  (Ordinal last_instr_count);
+
+Boolean arc_start_decoding (const char *filename,
+                            Ordinal    *first_instr_count,
+                            Ordinal    *last_instr_count);
+
+void    arc_stop_decoding  (void);
+
+void    arc_encode_PC (ARC_ProgramCounterEncoding  encoding, unsigned int  value);
+Boolean arc_decode_PC (ARC_ProgramCounterEncoding *encoding, unsigned int *value);
+
+#endif /* ARC_INSTRUCTION_TRACING_H */
+/******************************************************************************/