testsuites/unit/tc-misaligned-builtin-memcpy.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup TestsuitesUnitNoClock0
0007  */
0008
0009 /*
0010  * Copyright (C) 2019 embedded brains GmbH & Co. KG
0011  *
0012  * Redistribution and use in source and binary forms, with or without
0013  * modification, are permitted provided that the following conditions
0014  * are met:
0015  * 1. Redistributions of source code must retain the above copyright
0016  *    notice, this list of conditions and the following disclaimer.
0017  * 2. Redistributions in binary form must reproduce the above copyright
0018  *    notice, this list of conditions and the following disclaimer in the
0019  *    documentation and/or other materials provided with the distribution.
0020  *
0021  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0022  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0023  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0024  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0025  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0026  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0027  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0028  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0029  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0030  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0031  * POSSIBILITY OF SUCH DAMAGE.
0032  */
0033
0034 #include <string.h>
0035
0036 #include <rtems.h>
0037
0038 #include <rtems/test.h>
0039
0040 T_TEST_CASE(MisalignedBuiltinMemcpy)
0041 {
0042     double a;
0043     double b;
0044     char buf[2 * sizeof(double)];
0045     void *p;
0046
0047     p = &buf[0];
0048     p = (void *)((uintptr_t)p | 1);
0049     RTEMS_OBFUSCATE_VARIABLE(p);
0050     a = 123e4;
0051     RTEMS_OBFUSCATE_VARIABLE(a);
0052     a *= a;
0053     memcpy(p, &a, sizeof(a));
0054     RTEMS_OBFUSCATE_VARIABLE(p);
0055     memcpy(&b, p, sizeof(b));
0056     T_eq(a, b, "%f == %f", a, b);
0057 }