1 /*
2 * Copyright (c) 2013-2019, 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 notice,
10 * this list of conditions and the following disclaimer in the documentation
11 * 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 #include "pt_tnt_cache.h"
30
31 #include "intel-pt.h"
32
33
pt_tnt_cache_init(struct pt_tnt_cache * cache)34 void pt_tnt_cache_init(struct pt_tnt_cache *cache)
35 {
36 if (!cache)
37 return;
38
39 cache->tnt = 0ull;
40 cache->index = 0ull;
41 }
42
pt_tnt_cache_is_empty(const struct pt_tnt_cache * cache)43 int pt_tnt_cache_is_empty(const struct pt_tnt_cache *cache)
44 {
45 if (!cache)
46 return -pte_invalid;
47
48 return cache->index == 0;
49 }
50
pt_tnt_cache_query(struct pt_tnt_cache * cache)51 int pt_tnt_cache_query(struct pt_tnt_cache *cache)
52 {
53 int taken;
54
55 if (!cache)
56 return -pte_invalid;
57
58 if (!cache->index)
59 return -pte_bad_query;
60
61 taken = (cache->tnt & cache->index) != 0;
62 cache->index >>= 1;
63
64 return taken;
65 }
66
pt_tnt_cache_update_tnt(struct pt_tnt_cache * cache,const struct pt_packet_tnt * packet,const struct pt_config * config)67 int pt_tnt_cache_update_tnt(struct pt_tnt_cache *cache,
68 const struct pt_packet_tnt *packet,
69 const struct pt_config *config)
70 {
71 uint8_t bit_size;
72
73 (void) config;
74
75 if (!cache || !packet)
76 return -pte_invalid;
77
78 if (cache->index)
79 return -pte_bad_context;
80
81 bit_size = packet->bit_size;
82 if (!bit_size)
83 return -pte_bad_packet;
84
85 cache->tnt = packet->payload;
86 cache->index = 1ull << (bit_size - 1);
87
88 return 0;
89 }
90