1/*
2 * Copyright (c) 2015-2016, Intel Corporation
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * * Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of Intel Corporation nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef FDR_LOADVAL_H
30#define FDR_LOADVAL_H
31
32#include "ue2common.h"
33#include "util/unaligned.h"
34
35#define MAKE_LOADVAL(type, name) \
36 static really_inline \
37 type name(const u8 *ptr, UNUSED const u8 *lo, UNUSED const u8 *hi)
38
39#define NORMAL_SAFE(type) \
40 do { \
41 assert(ptr >= lo); \
42 assert(ptr + sizeof(type) - 1 < hi); \
43 } while(0)
44
45#define MAKE_LOOP_CE(TYPE) \
46 TYPE v = 0; \
47 for (TYPE i = 0; i < sizeof(TYPE); i++) { \
48 if ((lo <= ptr + i) && (ptr + i < hi)) { \
49 v += (TYPE)ptr[i] << (i*8); \
50 } \
51 } \
52 return v;
53
54// no suffix = normal (unaligned)
55// _ce = cautious everywhere (in both directions); test against hi and lo
56
57MAKE_LOADVAL(u16, lv_u16) {
58 NORMAL_SAFE(u16);
59 return unaligned_load_u16(ptr);
60}
61
62MAKE_LOADVAL(u64a, lv_u64a) {
63 NORMAL_SAFE(u32);
64 return unaligned_load_u64a(ptr);
65}
66
67MAKE_LOADVAL(u16, lv_u16_ce) { MAKE_LOOP_CE(u16); }
68
69MAKE_LOADVAL(u64a, lv_u64a_ce) { MAKE_LOOP_CE(u64a); }
70
71#endif
72