simplesim-3.0/endian.c

109 lines
3.6 KiB
C

/* endian.c - host endian probes */
/* SimpleScalar(TM) Tool Suite
* Copyright (C) 1994-2003 by Todd M. Austin, Ph.D. and SimpleScalar, LLC.
* All Rights Reserved.
*
* THIS IS A LEGAL DOCUMENT, BY USING SIMPLESCALAR,
* YOU ARE AGREEING TO THESE TERMS AND CONDITIONS.
*
* No portion of this work may be used by any commercial entity, or for any
* commercial purpose, without the prior, written permission of SimpleScalar,
* LLC (info@simplescalar.com). Nonprofit and noncommercial use is permitted
* as described below.
*
* 1. SimpleScalar is provided AS IS, with no warranty of any kind, express
* or implied. The user of the program accepts full responsibility for the
* application of the program and the use of any results.
*
* 2. Nonprofit and noncommercial use is encouraged. SimpleScalar may be
* downloaded, compiled, executed, copied, and modified solely for nonprofit,
* educational, noncommercial research, and noncommercial scholarship
* purposes provided that this notice in its entirety accompanies all copies.
* Copies of the modified software can be delivered to persons who use it
* solely for nonprofit, educational, noncommercial research, and
* noncommercial scholarship purposes provided that this notice in its
* entirety accompanies all copies.
*
* 3. ALL COMMERCIAL USE, AND ALL USE BY FOR PROFIT ENTITIES, IS EXPRESSLY
* PROHIBITED WITHOUT A LICENSE FROM SIMPLESCALAR, LLC (info@simplescalar.com).
*
* 4. No nonprofit user may place any restrictions on the use of this software,
* including as modified by the user, by any other authorized user.
*
* 5. Noncommercial and nonprofit users may distribute copies of SimpleScalar
* in compiled or executable form as set forth in Section 2, provided that
* either: (A) it is accompanied by the corresponding machine-readable source
* code, or (B) it is accompanied by a written offer, with no time limit, to
* give anyone a machine-readable copy of the corresponding source code in
* return for reimbursement of the cost of distribution. This written offer
* must permit verbatim duplication by anyone, or (C) it is distributed by
* someone who received only the executable form, and is accompanied by a
* copy of the written offer of source code.
*
* 6. SimpleScalar was developed by Todd M. Austin, Ph.D. The tool suite is
* currently maintained by SimpleScalar LLC (info@simplescalar.com). US Mail:
* 2395 Timbercrest Court, Ann Arbor, MI 48105.
*
* Copyright (C) 1994-2003 by Todd M. Austin, Ph.D. and SimpleScalar, LLC.
*/
#include "endian.h"
#ifndef HOST_ONLY
#include "loader.h"
#endif
/* probe host (simulator) byte endian format */
enum endian_t
endian_host_byte_order(void)
{
int i = 1, *p;
p = &i;
if (*((char *)p) == 1)
return endian_little;
else if (*((char *)p) == 0)
return endian_big;
else
return endian_unknown;
}
/* probe host (simulator) double word endian format */
enum endian_t
endian_host_word_order(void)
{
int *p;
double x = 1.0;
/* NOTE: this check assumes IEEE floating point format */
p = (int *)&x;
if (*p == 0)
return endian_little;
else if (*p == 0x3ff00000)
return endian_big;
else
return endian_unknown;
}
#ifndef HOST_ONLY
/* probe target (simulated program) byte endian format, only
valid after program has been loaded */
enum endian_t
endian_target_byte_order(void)
{
return ld_target_big_endian ? endian_big : endian_little;
}
/* probe target (simulated program) double word endian format,
only valid after program has been loaded */
enum endian_t
endian_target_word_order(void)
{
/* same as byte sex for SimpleScalar target */
return endian_target_byte_order();
}
#endif /* !HOST_ONLY */