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 | |
57 | MAKE_LOADVAL(u16, lv_u16) { |
58 | NORMAL_SAFE(u16); |
59 | return unaligned_load_u16(ptr); |
60 | } |
61 | |
62 | MAKE_LOADVAL(u64a, lv_u64a) { |
63 | NORMAL_SAFE(u32); |
64 | return unaligned_load_u64a(ptr); |
65 | } |
66 | |
67 | MAKE_LOADVAL(u16, lv_u16_ce) { MAKE_LOOP_CE(u16); } |
68 | |
69 | MAKE_LOADVAL(u64a, lv_u64a_ce) { MAKE_LOOP_CE(u64a); } |
70 | |
71 | #endif |
72 | |