1 | /* |
2 | * Copyright (c) 2015-2019, 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_CONFIRM_RUNTIME_H |
30 | #define FDR_CONFIRM_RUNTIME_H |
31 | |
32 | #include "scratch.h" |
33 | #include "fdr_internal.h" |
34 | #include "fdr_loadval.h" |
35 | #include "hwlm/hwlm.h" |
36 | #include "ue2common.h" |
37 | #include "util/bitutils.h" |
38 | #include "util/compare.h" |
39 | |
40 | // this is ordinary confirmation function which runs through |
41 | // the whole confirmation procedure |
42 | static really_inline |
43 | void confWithBit(const struct FDRConfirm *fdrc, const struct FDR_Runtime_Args *a, |
44 | size_t i, hwlmcb_rv_t *control, u32 *last_match, |
45 | u64a conf_key, u64a *conf, u8 bit) { |
46 | assert(i < a->len); |
47 | assert(i >= a->start_offset); |
48 | assert(ISALIGNED(fdrc)); |
49 | |
50 | const u8 * buf = a->buf; |
51 | u32 c = CONF_HASH_CALL(conf_key, fdrc->andmsk, fdrc->mult, |
52 | fdrc->nBits); |
53 | u32 start = getConfirmLitIndex(fdrc)[c]; |
54 | if (likely(!start)) { |
55 | return; |
56 | } |
57 | |
58 | const struct LitInfo *li |
59 | = (const struct LitInfo *)((const u8 *)fdrc + start); |
60 | |
61 | struct hs_scratch *scratch = a->scratch; |
62 | assert(!scratch->fdr_conf); |
63 | scratch->fdr_conf = conf; |
64 | scratch->fdr_conf_offset = bit; |
65 | u8 oldNext; // initialized in loop |
66 | do { |
67 | assert(ISALIGNED(li)); |
68 | scratch->pure = li->pure; |
69 | |
70 | if (unlikely((conf_key & li->msk) != li->v)) { |
71 | goto out; |
72 | } |
73 | |
74 | if ((*last_match == li->id) && (li->flags & FDR_LIT_FLAG_NOREPEAT)) { |
75 | goto out; |
76 | } |
77 | |
78 | const u8 *loc = buf + i - li->size + 1; |
79 | |
80 | if (loc < buf) { |
81 | u32 full_overhang = buf - loc; |
82 | size_t len_history = a->len_history; |
83 | |
84 | // can't do a vectored confirm either if we don't have |
85 | // the bytes |
86 | if (full_overhang > len_history) { |
87 | goto out; |
88 | } |
89 | } |
90 | assert(li->size <= sizeof(CONF_TYPE)); |
91 | |
92 | if (unlikely(!(li->groups & *control))) { |
93 | goto out; |
94 | } |
95 | |
96 | *last_match = li->id; |
97 | *control = a->cb(i, li->id, scratch); |
98 | out: |
99 | oldNext = li->next; // oldNext is either 0 or an 'adjust' value |
100 | li++; |
101 | } while (oldNext); |
102 | scratch->fdr_conf = NULL; |
103 | scratch->pure = 0; |
104 | } |
105 | |
106 | #endif |
107 | |