/* * Copyright (c) 2013-2019, Intel Corporation * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * * Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of Intel Corporation nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include "pt_tnt_cache.h" #include "intel-pt.h" void pt_tnt_cache_init(struct pt_tnt_cache *cache) { if (!cache) return; cache->tnt = 0ull; cache->index = 0ull; } int pt_tnt_cache_is_empty(const struct pt_tnt_cache *cache) { if (!cache) return -pte_invalid; return cache->index == 0; } int pt_tnt_cache_query(struct pt_tnt_cache *cache) { int taken; if (!cache) return -pte_invalid; if (!cache->index) return -pte_bad_query; taken = (cache->tnt & cache->index) != 0; cache->index >>= 1; return taken; } int pt_tnt_cache_update_tnt(struct pt_tnt_cache *cache, const struct pt_packet_tnt *packet, const struct pt_config *config) { uint8_t bit_size; (void) config; if (!cache || !packet) return -pte_invalid; if (cache->index) return -pte_bad_context; bit_size = packet->bit_size; if (!bit_size) return -pte_bad_packet; cache->tnt = packet->payload; cache->index = 1ull << (bit_size - 1); return 0; } |