Differential D12815 Diff 40474 processor-trace/24982c1a6fce48f1e416461d42899805f74fbb26/libipt/internal/include/pt_image_section_cache.h
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processor-trace/24982c1a6fce48f1e416461d42899805f74fbb26/libipt/internal/include/pt_image_section_cache.h
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/* | |||||
* Copyright (c) 2016-2018, 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_IMAGE_SECTION_CACHE_H | |||||
#define PT_IMAGE_SECTION_CACHE_H | |||||
#include <stdint.h> | |||||
#if defined(FEATURE_THREADS) | |||||
# include <threads.h> | |||||
#endif /* defined(FEATURE_THREADS) */ | |||||
struct pt_section; | |||||
/* An image section cache entry. */ | |||||
struct pt_iscache_entry { | |||||
/* The section object. | |||||
* | |||||
* We hold a reference to the section - put it when the section is | |||||
* removed from the cache. | |||||
*/ | |||||
struct pt_section *section; | |||||
/* The base address at which @section has been loaded. */ | |||||
uint64_t laddr; | |||||
}; | |||||
/* An image section cache least recently used cache entry. */ | |||||
struct pt_iscache_lru_entry { | |||||
/* The next entry in a list ordered by recent use. */ | |||||
struct pt_iscache_lru_entry *next; | |||||
/* The section mapped by the image section cache. */ | |||||
struct pt_section *section; | |||||
/* The amount of memory used by mapping @section in bytes. */ | |||||
uint64_t size; | |||||
}; | |||||
/* A cache of image sections and their load addresses. | |||||
* | |||||
* We combine the section with its load address to reduce the amount of | |||||
* information we need to store in order to read from a cached section by | |||||
* virtual address. | |||||
* | |||||
* Internally, the section object will be shared if it is loaded at different | |||||
* addresses in the cache. | |||||
* | |||||
* The cache does not consider the address-space the section is mapped into. | |||||
* This is not relevant for reading from the section. | |||||
*/ | |||||
struct pt_image_section_cache { | |||||
/* The optional name of the cache; NULL if not named. */ | |||||
char *name; | |||||
/* An array of @nentries cached sections. */ | |||||
struct pt_iscache_entry *entries; | |||||
/* A list of mapped sections ordered by time of last access. */ | |||||
struct pt_iscache_lru_entry *lru; | |||||
/* The memory limit for our LRU cache. */ | |||||
uint64_t limit; | |||||
/* The current size of our LRU cache. */ | |||||
uint64_t used; | |||||
#if defined(FEATURE_THREADS) | |||||
/* A lock protecting this image section cache. */ | |||||
mtx_t lock; | |||||
#endif /* defined(FEATURE_THREADS) */ | |||||
/* The capacity of the @entries array. | |||||
* | |||||
* Cached sections are identified by a positive integer, the image | |||||
* section identifier (isid), which is derived from their index into the | |||||
* @entries array. | |||||
* | |||||
* We can't expand the section cache capacity beyond INT_MAX. | |||||
*/ | |||||
uint16_t capacity; | |||||
/* The current size of the cache in number of entries. | |||||
* | |||||
* This is smaller than @capacity if there is still room in the @entries | |||||
* array; equal to @capacity if the @entries array is full and needs to | |||||
* be reallocated. | |||||
*/ | |||||
uint16_t size; | |||||
}; | |||||
/* Initialize an image section cache. */ | |||||
extern int pt_iscache_init(struct pt_image_section_cache *iscache, | |||||
const char *name); | |||||
/* Finalize an image section cache. */ | |||||
extern void pt_iscache_fini(struct pt_image_section_cache *iscache); | |||||
/* Add a section to the cache. | |||||
* | |||||
* Adds @section at @laddr to @iscache and returns its isid. If a similar | |||||
* section is already cached, returns that section's isid, instead. | |||||
* | |||||
* We take a full section rather than its filename and range in that file to | |||||
* avoid the dependency to pt_section.h. Callers are expected to query the | |||||
* cache before creating the section, so we should only see unnecessary section | |||||
* creation/destruction on insertion races. | |||||
* | |||||
* Returns zero on success, a negative error code otherwise. | |||||
* Returns -pte_internal if @iscache or @section is NULL. | |||||
* Returns -pte_internal if @section's filename is NULL. | |||||
*/ | |||||
extern int pt_iscache_add(struct pt_image_section_cache *iscache, | |||||
struct pt_section *section, uint64_t laddr); | |||||
/* Find a section in the cache. | |||||
* | |||||
* Returns a positive isid if a section matching @filename, @offset, @size | |||||
* loaded at @laddr is found in @iscache. | |||||
* Returns zero if no such section is found. | |||||
* Returns a negative error code otherwise. | |||||
* Returns -pte_internal if @iscache or @filename is NULL. | |||||
*/ | |||||
extern int pt_iscache_find(struct pt_image_section_cache *iscache, | |||||
const char *filename, uint64_t offset, | |||||
uint64_t size, uint64_t laddr); | |||||
/* Lookup the section identified by its isid. | |||||
* | |||||
* Provides a reference to the section in @section and its load address in | |||||
* @laddr on success. The caller is expected to put the returned section after | |||||
* use. | |||||
* | |||||
* Returns zero on success, a negative error code otherwise. | |||||
* Returns -pte_internal if @iscache, @section, or @laddr is NULL. | |||||
* Returns -pte_bad_image if @iscache does not contain @isid. | |||||
*/ | |||||
extern int pt_iscache_lookup(struct pt_image_section_cache *iscache, | |||||
struct pt_section **section, uint64_t *laddr, | |||||
int isid); | |||||
/* Clear an image section cache. */ | |||||
extern int pt_iscache_clear(struct pt_image_section_cache *iscache); | |||||
/* Notify about the mapping of a cached section. | |||||
* | |||||
* Notifies @iscache that @section has been mapped. | |||||
* | |||||
* The caller guarantees that @iscache contains @section (by using @section's | |||||
* iscache pointer) and prevents @iscache from detaching. | |||||
* | |||||
* The caller must not lock @section to allow @iscache to map it. This function | |||||
* must not try to detach from @section. | |||||
* | |||||
* Returns zero on success, a negative pt_error_code otherwise. | |||||
* Returns -pte_internal if @iscache or @section is NULL. | |||||
* Returns -pte_bad_lock on any locking error. | |||||
*/ | |||||
extern int pt_iscache_notify_map(struct pt_image_section_cache *iscache, | |||||
struct pt_section *section); | |||||
/* Notify about a size change of a mapped section. | |||||
* | |||||
* Notifies @iscache that @section's size has changed while it was mapped. | |||||
* | |||||
* The caller guarantees that @iscache contains @section (by using @section's | |||||
* iscache pointer) and prevents @iscache from detaching. | |||||
* | |||||
* The caller must not lock @section to allow @iscache to map it. This function | |||||
* must not try to detach from @section. | |||||
* | |||||
* Returns zero on success, a negative pt_error_code otherwise. | |||||
* Returns -pte_internal if @iscache or @section is NULL. | |||||
* Returns -pte_bad_lock on any locking error. | |||||
*/ | |||||
extern int pt_iscache_notify_resize(struct pt_image_section_cache *iscache, | |||||
struct pt_section *section, uint64_t size); | |||||
#endif /* PT_IMAGE_SECTION_CACHE_H */ |