1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __PERF_SYMBOL 3 #define __PERF_SYMBOL 1 4 5 #include <linux/types.h> 6 #include <linux/refcount.h> 7 #include <stdbool.h> 8 #include <stdint.h> 9 #include <linux/list.h> 10 #include <linux/rbtree.h> 11 #include <stdio.h> 12 #include "addr_location.h" 13 #include "path.h" 14 #include "symbol_conf.h" 15 #include "spark.h" 16 17 #ifdef HAVE_LIBELF_SUPPORT 18 #include <libelf.h> 19 #include <gelf.h> 20 #endif 21 #include <elf.h> 22 23 struct dso; 24 struct map; 25 struct maps; 26 struct option; 27 struct build_id; 28 29 /* 30 * libelf 0.8.x and earlier do not support ELF_C_READ_MMAP; 31 * for newer versions we can use mmap to reduce memory usage: 32 */ 33 #ifdef ELF_C_READ_MMAP 34 # define PERF_ELF_C_READ_MMAP ELF_C_READ_MMAP 35 #else 36 # define PERF_ELF_C_READ_MMAP ELF_C_READ 37 #endif 38 39 #ifdef HAVE_LIBELF_SUPPORT 40 Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, 41 GElf_Shdr *shp, const char *name, size_t *idx); 42 #endif 43 44 /** 45 * A symtab entry. When allocated this may be preceded by an annotation (see 46 * symbol__annotation) and/or a browser_index (see symbol__browser_index). 47 */ 48 struct symbol { 49 struct rb_node rb_node; 50 /** Range of symbol [start, end). */ 51 u64 start; 52 u64 end; 53 /** Length of the string name. */ 54 u16 namelen; 55 /** ELF symbol type as defined for st_info. E.g STT_OBJECT or STT_FUNC. */ 56 u8 type:4; 57 /** ELF binding type as defined for st_info. E.g. STB_WEAK or STB_GLOBAL. */ 58 u8 binding:4; 59 /** Set true for kernel symbols of idle routines. */ 60 u8 idle:1; 61 /** Resolvable but tools ignore it (e.g. idle routines). */ 62 u8 ignore:1; 63 /** Symbol for an inlined function. */ 64 u8 inlined:1; 65 /** Has symbol__annotate2 been performed. */ 66 u8 annotate2:1; 67 /** Symbol is an alias of an STT_GNU_IFUNC */ 68 u8 ifunc_alias:1; 69 /** Architecture specific. Unused except on PPC where it holds st_other. */ 70 u8 arch_sym; 71 /** The name of length namelen associated with the symbol. */ 72 char name[]; 73 }; 74 75 void symbol__delete(struct symbol *sym); 76 void symbols__delete(struct rb_root_cached *symbols); 77 78 /* symbols__for_each_entry - iterate over symbols (rb_root) 79 * 80 * @symbols: the rb_root of symbols 81 * @pos: the 'struct symbol *' to use as a loop cursor 82 * @nd: the 'struct rb_node *' to use as a temporary storage 83 */ 84 #define symbols__for_each_entry(symbols, pos, nd) \ 85 for (nd = rb_first_cached(symbols); \ 86 nd && (pos = rb_entry(nd, struct symbol, rb_node)); \ 87 nd = rb_next(nd)) 88 89 static inline size_t symbol__size(const struct symbol *sym) 90 { 91 return sym->end - sym->start; 92 } 93 94 struct strlist; 95 struct intlist; 96 97 static inline int __symbol__join_symfs(char *bf, size_t size, const char *path) 98 { 99 return path__join(bf, size, symbol_conf.symfs, path); 100 } 101 102 #define symbol__join_symfs(bf, path) __symbol__join_symfs(bf, sizeof(bf), path) 103 104 extern int vmlinux_path__nr_entries; 105 extern char **vmlinux_path; 106 107 static inline void *symbol__priv(struct symbol *sym) 108 { 109 return ((void *)sym) - symbol_conf.priv_size; 110 } 111 112 struct ref_reloc_sym { 113 const char *name; 114 u64 addr; 115 u64 unrelocated_addr; 116 }; 117 118 int dso__load(struct dso *dso, struct map *map); 119 int dso__load_vmlinux(struct dso *dso, struct map *map, 120 const char *vmlinux, bool vmlinux_allocated); 121 int dso__load_vmlinux_path(struct dso *dso, struct map *map); 122 int __dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map, 123 bool no_kcore); 124 int dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map); 125 126 void dso__insert_symbol(struct dso *dso, 127 struct symbol *sym); 128 void dso__delete_symbol(struct dso *dso, 129 struct symbol *sym); 130 131 struct symbol *dso__find_symbol(struct dso *dso, u64 addr); 132 struct symbol *dso__find_symbol_nocache(struct dso *dso, u64 addr); 133 134 struct symbol *dso__next_symbol_by_name(struct dso *dso, size_t *idx); 135 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name, size_t *idx); 136 137 struct symbol *dso__first_symbol(struct dso *dso); 138 struct symbol *dso__last_symbol(struct dso *dso); 139 struct symbol *dso__next_symbol(struct symbol *sym); 140 141 enum dso_type dso__type_fd(int fd); 142 143 int filename__read_build_id(const char *filename, struct build_id *id); 144 int sysfs__read_build_id(const char *filename, struct build_id *bid); 145 int modules__parse(const char *filename, void *arg, 146 int (*process_module)(void *arg, const char *name, 147 u64 start, u64 size)); 148 int filename__read_debuglink(const char *filename, char *debuglink, 149 size_t size); 150 bool filename__has_section(const char *filename, const char *sec); 151 152 struct perf_env; 153 int symbol__init(struct perf_env *env); 154 void symbol__exit(void); 155 void symbol__elf_init(void); 156 int symbol__annotation_init(void); 157 158 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name); 159 size_t __symbol__fprintf_symname_offs(const struct symbol *sym, 160 const struct addr_location *al, 161 bool unknown_as_addr, 162 bool print_offsets, FILE *fp); 163 size_t symbol__fprintf_symname_offs(const struct symbol *sym, 164 const struct addr_location *al, FILE *fp); 165 size_t __symbol__fprintf_symname(const struct symbol *sym, 166 const struct addr_location *al, 167 bool unknown_as_addr, FILE *fp); 168 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp); 169 size_t symbol__fprintf(struct symbol *sym, FILE *fp); 170 bool symbol__restricted_filename(const char *filename, 171 const char *restricted_filename); 172 int symbol__config_symfs(const struct option *opt __maybe_unused, 173 const char *dir, int unset __maybe_unused); 174 175 struct symsrc; 176 177 #ifdef HAVE_LIBBFD_SUPPORT 178 int dso__load_bfd_symbols(struct dso *dso, const char *debugfile); 179 #endif 180 181 int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss, 182 struct symsrc *runtime_ss, int kmodule); 183 int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss); 184 185 char *dso__demangle_sym(struct dso *dso, int kmodule, const char *elf_name); 186 187 void __symbols__insert(struct rb_root_cached *symbols, struct symbol *sym, 188 bool kernel); 189 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym); 190 void symbols__fixup_duplicate(struct rb_root_cached *symbols); 191 void symbols__fixup_end(struct rb_root_cached *symbols, bool is_kallsyms); 192 193 typedef int (*mapfn_t)(u64 start, u64 len, u64 pgoff, void *data); 194 int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data, 195 bool *is_64_bit); 196 197 #define PERF_KCORE_EXTRACT "/tmp/perf-kcore-XXXXXX" 198 199 struct kcore_extract { 200 char *kcore_filename; 201 u64 addr; 202 u64 offs; 203 u64 len; 204 char extract_filename[sizeof(PERF_KCORE_EXTRACT)]; 205 int fd; 206 }; 207 208 int kcore_extract__create(struct kcore_extract *kce); 209 void kcore_extract__delete(struct kcore_extract *kce); 210 211 int kcore_copy(const char *from_dir, const char *to_dir); 212 int compare_proc_modules(const char *from, const char *to); 213 214 int setup_list(struct strlist **list, const char *list_str, 215 const char *list_name); 216 int setup_intlist(struct intlist **list, const char *list_str, 217 const char *list_name); 218 219 #ifdef HAVE_LIBELF_SUPPORT 220 bool elf__needs_adjust_symbols(GElf_Ehdr ehdr); 221 void arch__sym_update(struct symbol *s, GElf_Sym *sym); 222 #endif 223 224 const char *arch__normalize_symbol_name(const char *name); 225 #define SYMBOL_A 0 226 #define SYMBOL_B 1 227 228 int arch__compare_symbol_names(const char *namea, const char *nameb); 229 int arch__compare_symbol_names_n(const char *namea, const char *nameb, 230 unsigned int n); 231 int arch__choose_best_symbol(struct symbol *syma, struct symbol *symb); 232 233 enum symbol_tag_include { 234 SYMBOL_TAG_INCLUDE__NONE = 0, 235 SYMBOL_TAG_INCLUDE__DEFAULT_ONLY 236 }; 237 238 int symbol__match_symbol_name(const char *namea, const char *nameb, 239 enum symbol_tag_include includes); 240 241 /* structure containing an SDT note's info */ 242 struct sdt_note { 243 char *name; /* name of the note*/ 244 char *provider; /* provider name */ 245 char *args; 246 bool bit32; /* whether the location is 32 bits? */ 247 union { /* location, base and semaphore addrs */ 248 Elf64_Addr a64[3]; 249 Elf32_Addr a32[3]; 250 } addr; 251 struct list_head note_list; /* SDT notes' list */ 252 }; 253 254 int get_sdt_note_list(struct list_head *head, const char *target); 255 int cleanup_sdt_note_list(struct list_head *sdt_notes); 256 int sdt_notes__get_count(struct list_head *start); 257 258 #define SDT_PROBES_SCN ".probes" 259 #define SDT_BASE_SCN ".stapsdt.base" 260 #define SDT_NOTE_SCN ".note.stapsdt" 261 #define SDT_NOTE_TYPE 3 262 #define SDT_NOTE_NAME "stapsdt" 263 #define NR_ADDR 3 264 265 enum { 266 SDT_NOTE_IDX_LOC = 0, 267 SDT_NOTE_IDX_BASE, 268 SDT_NOTE_IDX_REFCTR, 269 }; 270 271 int symbol__validate_sym_arguments(void); 272 273 #endif /* __PERF_SYMBOL */ 274