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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 */
/******************************************************************************/
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