| /* |
| * Copyright (c) 2013-2015, 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. |
| */ |
| |
| #ifndef PT_TNT_CACHE_H |
| #define PT_TNT_CACHE_H |
| |
| #include <stdint.h> |
| |
| struct pt_packet_tnt; |
| struct pt_config; |
| |
| |
| /* Keeping track of tnt indicators. */ |
| struct pt_tnt_cache { |
| /* The last tnt. */ |
| uint64_t tnt; |
| |
| /* The index into the above tnt. |
| * |
| * (tnt & index) gives the current tnt entry. |
| * (index >>= 1) moves the index to the next tnt entry. |
| * (index == 0) means that the current tnt is empty. |
| */ |
| uint64_t index; |
| }; |
| |
| |
| /* Initialize (or reset) the tnt cache. */ |
| extern void pt_tnt_cache_init(struct pt_tnt_cache *cache); |
| |
| /* Check if the tnt cache is empty. |
| * |
| * Returns 0 if the tnt cache is not empty. |
| * Returns > 0 if the tnt cache is empty. |
| * Returns -pte_invalid if @cache is NULL. |
| */ |
| extern int pt_tnt_cache_is_empty(const struct pt_tnt_cache *cache); |
| |
| /* Query the next tnt indicator. |
| * |
| * This consumes the returned tnt indicator in the cache. |
| * |
| * Returns 0 if the next branch is not taken. |
| * Returns > 0 if the next branch is taken. |
| * Returns -pte_invalid if @cache is NULL. |
| * Returns -pte_bad_query if there is no tnt cached. |
| */ |
| extern int pt_tnt_cache_query(struct pt_tnt_cache *cache); |
| |
| /* Update the tnt cache based on Intel PT packets. |
| * |
| * Updates @cache based on @packet and, if non-null, @config. |
| * |
| * Returns zero on success. |
| * Returns -pte_invalid if @cache or @packet is NULL. |
| * Returns -pte_bad_packet if @packet appears to be corrupted. |
| * Returns -pte_bad_context if the tnt cache is not empty. |
| */ |
| extern int pt_tnt_cache_update_tnt(struct pt_tnt_cache *cache, |
| const struct pt_packet_tnt *packet, |
| const struct pt_config *config); |
| |
| #endif /* PT_TNT_CACHE_H */ |