core/arch/encode_shared.c

/* **********************************************************
 * Copyright (c) 2011-2014 Google, Inc.  All rights reserved.
 * Copyright (c) 2001-2010 VMware, Inc.  All rights reserved.
 * **********************************************************/

/*
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of VMware, Inc. nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL VMWARE, INC. OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

/* Copyright (c) 2003-2007 Determina Corp. */
/* Copyright (c) 2001-2003 Massachusetts Institute of Technology */
/* Copyright (c) 2001 Hewlett-Packard Company */

/* encode_shared.c -- cross-platform encodingn routines */

#include "../globals.h"
#include "arch.h"
#include "instr.h"
#include "decode.h"
#include "disassemble.h"
#include "decode_fast.h"
#include "decode_private.h"

#ifdef DEBUG
/* case 10450: give messages to clients */
/* we can't undef ASSERT b/c of DYNAMO_OPTION */
# undef ASSERT_TRUNCATE
# undef ASSERT_BITFIELD_TRUNCATE
# undef ASSERT_NOT_REACHED
# define ASSERT_TRUNCATE DO_NOT_USE_ASSERT_USE_CLIENT_ASSERT_INSTEAD
# define ASSERT_BITFIELD_TRUNCATE DO_NOT_USE_ASSERT_USE_CLIENT_ASSERT_INSTEAD
# define ASSERT_NOT_REACHED DO_NOT_USE_ASSERT_USE_CLIENT_ASSERT_INSTEAD
#endif

/* In arch-specific file */
bool
encoding_possible(decode_info_t *di, instr_t *in, const instr_info_t * ii);

void
decode_info_init_for_instr(decode_info_t *di, instr_t *instr);

/* exported, looks at all possible instr_info_t templates
 */
bool
instr_is_encoding_possible(instr_t *instr)
{
    const instr_info_t * info = get_encoding_info(instr);
    return (info != NULL);
}

/* looks at all possible instr_info_t templates, returns first match
 * returns NULL if no encoding is possible
 */
const instr_info_t *
get_encoding_info(instr_t *instr)
{
    const instr_info_t * info = instr_get_instr_info(instr);
    decode_info_t di;
    decode_info_init_for_instr(&di, instr);

    while (!encoding_possible(&di, instr, info)) {
        info = get_next_instr_info(info);
        /* stop when hit end of list or when hit extra operand tables (OP_CONTD) */
        if (info == NULL || info->opcode == OP_CONTD) {
            return NULL;
        }
    }
    return info;
}