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 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 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 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 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