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 #ifndef PT_SECTION_FILE_H 30 #define PT_SECTION_FILE_H 31 32 #include <stdio.h> 33 #include <stdint.h> 34 35 #if defined(FEATURE_THREADS) 36 # include <threads.h> 37 #endif /* defined(FEATURE_THREADS) */ 38 39 struct pt_section; 40 41 42 /* File-based section mapping information. */ 43 struct pt_sec_file_mapping { 44 /* The FILE pointer. */ 45 FILE *file; 46 47 /* The begin and end of the section as offset into @file. */ 48 long begin, end; 49 50 #if defined(FEATURE_THREADS) 51 /* A lock protecting read access to this file. 52 * 53 * Since we need to first set the file position indication before 54 * we can read, there's a race on the file position. 55 */ 56 mtx_t lock; 57 #endif /* defined(FEATURE_THREADS) */ 58 }; 59 60 61 /* Map a section based on file operations. 62 * 63 * The caller has already opened the file for reading. 64 * 65 * On success, sets @section's mapping, unmap, and read pointers. 66 * 67 * Returns zero on success, a negative error code otherwise. 68 * Returns -pte_internal if @section or @file are NULL. 69 * Returns -pte_invalid if @section can't be mapped. 70 */ 71 extern int pt_sec_file_map(struct pt_section *section, FILE *file); 72 73 /* Unmap a section based on file operations. 74 * 75 * On success, clears @section's mapping, unmap, and read pointers. 76 * 77 * Returns zero on success, a negative error code otherwise. 78 * Returns -pte_internal if @section is NULL. 79 * Returns -pte_internal if @section has not been mapped. 80 */ 81 extern int pt_sec_file_unmap(struct pt_section *section); 82 83 /* Read memory from a file based section. 84 * 85 * Reads at most @size bytes from @section at @offset into @buffer. 86 * 87 * Returns the number of bytes read on success, a negative error code otherwise. 88 * Returns -pte_invalid if @section or @buffer are NULL. 89 * Returns -pte_nomap if @offset is beyond the end of the section. 90 */ 91 extern int pt_sec_file_read(const struct pt_section *section, uint8_t *buffer, 92 uint16_t size, uint64_t offset); 93 94 /* Compute the memory size of a section based on file operations. 95 * 96 * On success, provides the amount of memory used for mapping @section in bytes 97 * in @size. 98 * 99 * Returns zero on success, a negative error code otherwise. 100 * Returns -pte_internal if @section or @size is NULL. 101 * Returns -pte_internal if @section has not been mapped. 102 */ 103 extern int pt_sec_file_memsize(const struct pt_section *section, 104 uint64_t *size); 105 106 #endif /* PT_SECTION_FILE_H */ 107