1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SIMPLE_PERF_RECORD_FILE_FORMAT_H_ 18 #define SIMPLE_PERF_RECORD_FILE_FORMAT_H_ 19 20 #include <string> 21 22 #include "perf_event.h" 23 24 /* 25 The file structure of perf.data: 26 file_header 27 id_section 28 attr section 29 data section 30 feature section 31 32 The feature section has the following structure: 33 a section descriptor array, each element contains the section information of one add_feature. 34 data section of feature 1 35 data section of feature 2 36 .... 37 38 file feature section: 39 file_struct files[]; 40 41 struct file_struct { 42 uint32_t size; // size of rest fields in file_struct 43 char file_path[]; 44 uint32_t file_type; 45 uint64_t min_vaddr; 46 uint32_t symbol_count; 47 struct { 48 uint64_t start_vaddr; 49 uint32_t len; 50 char symbol_name[len+1]; 51 } symbol_table[symbol_count]; 52 53 uint32_t dex_file_offset_count; // Only when file_type = DSO_DEX_FILE 54 uint64_t dex_file_offsets[dex_file_offset_count]; // Only when file_type = DSO_DEX_FILE 55 uint64_t file_offset_of_min_vaddr; // Only when file_type = DSO_ELF_FILE 56 uint64_t memory_offset_of_min_vaddr; // Only when file_type = DSO_KERNEL_MODULE 57 }; 58 59 meta_info feature section: 60 meta_info infos[]; 61 62 struct meta_info { 63 char key[]; 64 char value[]; 65 }; 66 keys in meta_info feature section include: 67 simpleperf_version, 68 69 debug_unwind feature section: 70 message DebugUnwindFeature from record_file.proto 71 72 debug_unwind_file feature section: 73 data for file 1 74 data for file 2 75 ... 76 77 The file list is stored in debug_unwind feature section. 78 79 file2 feature section (used to replace file feature section): 80 uint32_t file_msg1_size; 81 FileFeature file_msg1; // FileFeature from record_file.proto 82 uint32_t file_msg2_size; 83 FileFeature file_msg2; 84 ... 85 */ 86 87 namespace simpleperf { 88 namespace PerfFileFormat { 89 90 enum { 91 FEAT_RESERVED = 0, 92 FEAT_FIRST_FEATURE = 1, 93 FEAT_TRACING_DATA = 1, 94 FEAT_BUILD_ID, 95 FEAT_HOSTNAME, 96 FEAT_OSRELEASE, 97 FEAT_VERSION, 98 FEAT_ARCH, 99 FEAT_NRCPUS, 100 FEAT_CPUDESC, 101 FEAT_CPUID, 102 FEAT_TOTAL_MEM, 103 FEAT_CMDLINE, 104 FEAT_EVENT_DESC, 105 FEAT_CPU_TOPOLOGY, 106 FEAT_NUMA_TOPOLOGY, 107 FEAT_BRANCH_STACK, 108 FEAT_PMU_MAPPINGS, 109 FEAT_GROUP_DESC, 110 FEAT_AUXTRACE, 111 FEAT_LAST_FEATURE, 112 113 FEAT_SIMPLEPERF_START = 128, 114 FEAT_FILE = FEAT_SIMPLEPERF_START, 115 FEAT_META_INFO, 116 FEAT_DEBUG_UNWIND, 117 FEAT_DEBUG_UNWIND_FILE, 118 FEAT_FILE2, 119 FEAT_MAX_NUM = 256, 120 }; 121 122 std::string GetFeatureName(int feature_id); 123 int GetFeatureId(const std::string& feature_name); 124 125 struct SectionDesc { 126 uint64_t offset; 127 uint64_t size; 128 }; 129 130 constexpr char PERF_MAGIC[] = "PERFILE2"; 131 132 struct FileHeader { 133 char magic[8]; 134 uint64_t header_size; 135 uint64_t attr_size; 136 SectionDesc attrs; 137 SectionDesc data; 138 SectionDesc event_types; 139 unsigned char features[FEAT_MAX_NUM / 8]; 140 }; 141 142 struct FileAttr { 143 perf_event_attr attr; 144 SectionDesc ids; 145 }; 146 147 } // namespace PerfFileFormat 148 } // namespace simpleperf 149 150 #endif // SIMPLE_PERF_RECORD_FILE_FORMAT_H_ 151