tools/perf/util/symbol.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __PERF_SYMBOL
   3 #define __PERF_SYMBOL 1
   4
   5 #include <linux/types.h>
   6 #include <stdbool.h>
   7 #include <stdint.h>
   8 #include "map.h"
   9 #include "../perf.h"
  10 #include <linux/list.h>
  11 #include <linux/rbtree.h>
  12 #include <stdio.h>
  13 #include <byteswap.h>
  14 #include <libgen.h>
  15 #include "build-id.h"
  16 #include "event.h"
  17 #include "path.h"
  18
  19 #ifdef HAVE_LIBELF_SUPPORT
  20 #include <libelf.h>
  21 #include <gelf.h>
  22 #endif
  23 #include <elf.h>
  24
  25 #include "dso.h"
  26
  27 /*
  28  * libelf 0.8.x and earlier do not support ELF_C_READ_MMAP;
  29  * for newer versions we can use mmap to reduce memory usage:
  30  */
  31 #ifdef HAVE_LIBELF_MMAP_SUPPORT
  32 # define PERF_ELF_C_READ_MMAP ELF_C_READ_MMAP
  33 #else
  34 # define PERF_ELF_C_READ_MMAP ELF_C_READ
  35 #endif
  36
  37 #ifdef HAVE_LIBELF_SUPPORT
  38 Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
  39                              GElf_Shdr *shp, const char *name, size_t *idx);
  40 #endif
  41
  42 #ifndef DMGL_PARAMS
  43 #define DMGL_NO_OPTS     0              /* For readability... */
  44 #define DMGL_PARAMS      (1 << 0)       /* Include function args */
  45 #define DMGL_ANSI        (1 << 1)       /* Include const, volatile, etc */
  46 #endif
  47
  48 #define DSO__NAME_KALLSYMS      "[kernel.kallsyms]"
  49 #define DSO__NAME_KCORE         "[kernel.kcore]"
  50
  51 /** struct symbol - symtab entry
  52  *
  53  * @ignore - resolvable but tools ignore it (e.g. idle routines)
  54  */
  55 struct symbol {
  56         struct rb_node  rb_node;
  57         u64             start;
  58         u64             end;
  59         u16             namelen;
  60         u8              binding;
  61         u8              idle:1;
  62         u8              ignore:1;
  63         u8              inlined:1;
  64         u8              arch_sym;
  65         char            name[0];
  66 };
  67
  68 void symbol__delete(struct symbol *sym);
  69 void symbols__delete(struct rb_root *symbols);
  70
  71 /* symbols__for_each_entry - iterate over symbols (rb_root)
  72  *
  73  * @symbols: the rb_root of symbols
  74  * @pos: the 'struct symbol *' to use as a loop cursor
  75  * @nd: the 'struct rb_node *' to use as a temporary storage
  76  */
  77 #define symbols__for_each_entry(symbols, pos, nd)                       \
  78         for (nd = rb_first(symbols);                                    \
  79              nd && (pos = rb_entry(nd, struct symbol, rb_node));        \
  80              nd = rb_next(nd))
  81
  82 static inline size_t symbol__size(const struct symbol *sym)
  83 {
  84         return sym->end - sym->start;
  85 }
  86
  87 struct strlist;
  88 struct intlist;
  89
  90 struct symbol_conf {
  91         unsigned short  priv_size;
  92         unsigned short  nr_events;
  93         bool            try_vmlinux_path,
  94                         init_annotation,
  95                         force,
  96                         ignore_vmlinux,
  97                         ignore_vmlinux_buildid,
  98                         show_kernel_path,
  99                         use_modules,
 100                         allow_aliases,
 101                         sort_by_name,
 102                         show_nr_samples,
 103                         show_total_period,
 104                         use_callchain,
 105                         cumulate_callchain,
 106                         show_branchflag_count,
 107                         exclude_other,
 108                         show_cpu_utilization,
 109                         initialized,
 110                         kptr_restrict,
 111                         annotate_asm_raw,
 112                         annotate_src,
 113                         event_group,
 114                         demangle,
 115                         demangle_kernel,
 116                         filter_relative,
 117                         show_hist_headers,
 118                         branch_callstack,
 119                         has_filter,
 120                         show_ref_callgraph,
 121                         hide_unresolved,
 122                         raw_trace,
 123                         report_hierarchy,
 124                         inline_name;
 125         const char      *vmlinux_name,
 126                         *kallsyms_name,
 127                         *source_prefix,
 128                         *field_sep;
 129         const char      *default_guest_vmlinux_name,
 130                         *default_guest_kallsyms,
 131                         *default_guest_modules;
 132         const char      *guestmount;
 133         const char      *dso_list_str,
 134                         *comm_list_str,
 135                         *pid_list_str,
 136                         *tid_list_str,
 137                         *sym_list_str,
 138                         *col_width_list_str,
 139                         *bt_stop_list_str;
 140        struct strlist   *dso_list,
 141                         *comm_list,
 142                         *sym_list,
 143                         *dso_from_list,
 144                         *dso_to_list,
 145                         *sym_from_list,
 146                         *sym_to_list,
 147                         *bt_stop_list;
 148         struct intlist  *pid_list,
 149                         *tid_list;
 150         const char      *symfs;
 151 };
 152
 153 extern struct symbol_conf symbol_conf;
 154
 155 struct symbol_name_rb_node {
 156         struct rb_node  rb_node;
 157         struct symbol   sym;
 158 };
 159
 160 static inline int __symbol__join_symfs(char *bf, size_t size, const char *path)
 161 {
 162         return path__join(bf, size, symbol_conf.symfs, path);
 163 }
 164
 165 #define symbol__join_symfs(bf, path) __symbol__join_symfs(bf, sizeof(bf), path)
 166
 167 extern int vmlinux_path__nr_entries;
 168 extern char **vmlinux_path;
 169
 170 static inline void *symbol__priv(struct symbol *sym)
 171 {
 172         return ((void *)sym) - symbol_conf.priv_size;
 173 }
 174
 175 struct ref_reloc_sym {
 176         const char      *name;
 177         u64             addr;
 178         u64             unrelocated_addr;
 179 };
 180
 181 struct map_symbol {
 182         struct map    *map;
 183         struct symbol *sym;
 184 };
 185
 186 struct addr_map_symbol {
 187         struct map    *map;
 188         struct symbol *sym;
 189         u64           addr;
 190         u64           al_addr;
 191         u64           phys_addr;
 192 };
 193
 194 struct branch_info {
 195         struct addr_map_symbol from;
 196         struct addr_map_symbol to;
 197         struct branch_flags flags;
 198         char                    *srcline_from;
 199         char                    *srcline_to;
 200 };
 201
 202 struct mem_info {
 203         struct addr_map_symbol iaddr;
 204         struct addr_map_symbol daddr;
 205         union perf_mem_data_src data_src;
 206 };
 207
 208 struct addr_location {
 209         struct machine *machine;
 210         struct thread *thread;
 211         struct map    *map;
 212         struct symbol *sym;
 213         const char    *srcline;
 214         u64           addr;
 215         char          level;
 216         u8            filtered;
 217         u8            cpumode;
 218         s32           cpu;
 219         s32           socket;
 220 };
 221
 222 struct symsrc {
 223         char *name;
 224         int fd;
 225         enum dso_binary_type type;
 226
 227 #ifdef HAVE_LIBELF_SUPPORT
 228         Elf *elf;
 229         GElf_Ehdr ehdr;
 230
 231         Elf_Scn *opdsec;
 232         size_t opdidx;
 233         GElf_Shdr opdshdr;
 234
 235         Elf_Scn *symtab;
 236         GElf_Shdr symshdr;
 237
 238         Elf_Scn *dynsym;
 239         size_t dynsym_idx;
 240         GElf_Shdr dynshdr;
 241
 242         bool adjust_symbols;
 243         bool is_64_bit;
 244 #endif
 245 };
 246
 247 void symsrc__destroy(struct symsrc *ss);
 248 int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
 249                  enum dso_binary_type type);
 250 bool symsrc__has_symtab(struct symsrc *ss);
 251 bool symsrc__possibly_runtime(struct symsrc *ss);
 252
 253 int dso__load(struct dso *dso, struct map *map);
 254 int dso__load_vmlinux(struct dso *dso, struct map *map,
 255                       const char *vmlinux, bool vmlinux_allocated);
 256 int dso__load_vmlinux_path(struct dso *dso, struct map *map);
 257 int __dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map,
 258                          bool no_kcore);
 259 int dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map);
 260
 261 void dso__insert_symbol(struct dso *dso, enum map_type type,
 262                         struct symbol *sym);
 263
 264 struct symbol *dso__find_symbol(struct dso *dso, enum map_type type,
 265                                 u64 addr);
 266 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
 267                                         const char *name);
 268 struct symbol *symbol__next_by_name(struct symbol *sym);
 269
 270 struct symbol *dso__first_symbol(struct dso *dso, enum map_type type);
 271 struct symbol *dso__last_symbol(struct dso *dso, enum map_type type);
 272 struct symbol *dso__next_symbol(struct symbol *sym);
 273
 274 enum dso_type dso__type_fd(int fd);
 275
 276 int filename__read_build_id(const char *filename, void *bf, size_t size);
 277 int sysfs__read_build_id(const char *filename, void *bf, size_t size);
 278 int modules__parse(const char *filename, void *arg,
 279                    int (*process_module)(void *arg, const char *name,
 280                                          u64 start, u64 size));
 281 int filename__read_debuglink(const char *filename, char *debuglink,
 282                              size_t size);
 283
 284 struct perf_env;
 285 int symbol__init(struct perf_env *env);
 286 void symbol__exit(void);
 287 void symbol__elf_init(void);
 288 int symbol__annotation_init(void);
 289
 290 struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name);
 291 size_t __symbol__fprintf_symname_offs(const struct symbol *sym,
 292                                       const struct addr_location *al,
 293                                       bool unknown_as_addr,
 294                                       bool print_offsets, FILE *fp);
 295 size_t symbol__fprintf_symname_offs(const struct symbol *sym,
 296                                     const struct addr_location *al, FILE *fp);
 297 size_t __symbol__fprintf_symname(const struct symbol *sym,
 298                                  const struct addr_location *al,
 299                                  bool unknown_as_addr, FILE *fp);
 300 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp);
 301 size_t symbol__fprintf(struct symbol *sym, FILE *fp);
 302 bool symbol_type__is_a(char symbol_type, enum map_type map_type);
 303 bool symbol__restricted_filename(const char *filename,
 304                                  const char *restricted_filename);
 305 int symbol__config_symfs(const struct option *opt __maybe_unused,
 306                          const char *dir, int unset __maybe_unused);
 307
 308 int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss,
 309                   struct symsrc *runtime_ss, int kmodule);
 310 int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss,
 311                                 struct map *map);
 312
 313 char *dso__demangle_sym(struct dso *dso, int kmodule, const char *elf_name);
 314
 315 void __symbols__insert(struct rb_root *symbols, struct symbol *sym, bool kernel);
 316 void symbols__insert(struct rb_root *symbols, struct symbol *sym);
 317 void symbols__fixup_duplicate(struct rb_root *symbols);
 318 void symbols__fixup_end(struct rb_root *symbols);
 319 void __map_groups__fixup_end(struct map_groups *mg, enum map_type type);
 320
 321 typedef int (*mapfn_t)(u64 start, u64 len, u64 pgoff, void *data);
 322 int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data,
 323                     bool *is_64_bit);
 324
 325 #define PERF_KCORE_EXTRACT "/tmp/perf-kcore-XXXXXX"
 326
 327 struct kcore_extract {
 328         char *kcore_filename;
 329         u64 addr;
 330         u64 offs;
 331         u64 len;
 332         char extract_filename[sizeof(PERF_KCORE_EXTRACT)];
 333         int fd;
 334 };
 335
 336 int kcore_extract__create(struct kcore_extract *kce);
 337 void kcore_extract__delete(struct kcore_extract *kce);
 338
 339 int kcore_copy(const char *from_dir, const char *to_dir);
 340 int compare_proc_modules(const char *from, const char *to);
 341
 342 int setup_list(struct strlist **list, const char *list_str,
 343                const char *list_name);
 344 int setup_intlist(struct intlist **list, const char *list_str,
 345                   const char *list_name);
 346
 347 #ifdef HAVE_LIBELF_SUPPORT
 348 bool elf__needs_adjust_symbols(GElf_Ehdr ehdr);
 349 void arch__sym_update(struct symbol *s, GElf_Sym *sym);
 350 #endif
 351
 352 const char *arch__normalize_symbol_name(const char *name);
 353 #define SYMBOL_A 0
 354 #define SYMBOL_B 1
 355
 356 int arch__compare_symbol_names(const char *namea, const char *nameb);
 357 int arch__compare_symbol_names_n(const char *namea, const char *nameb,
 358                                  unsigned int n);
 359 int arch__choose_best_symbol(struct symbol *syma, struct symbol *symb);
 360
 361 enum symbol_tag_include {
 362         SYMBOL_TAG_INCLUDE__NONE = 0,
 363         SYMBOL_TAG_INCLUDE__DEFAULT_ONLY
 364 };
 365
 366 int symbol__match_symbol_name(const char *namea, const char *nameb,
 367                               enum symbol_tag_include includes);
 368
 369 /* structure containing an SDT note's info */
 370 struct sdt_note {
 371         char *name;                     /* name of the note*/
 372         char *provider;                 /* provider name */
 373         char *args;
 374         bool bit32;                     /* whether the location is 32 bits? */
 375         union {                         /* location, base and semaphore addrs */
 376                 Elf64_Addr a64[3];
 377                 Elf32_Addr a32[3];
 378         } addr;
 379         struct list_head note_list;     /* SDT notes' list */
 380 };
 381
 382 int get_sdt_note_list(struct list_head *head, const char *target);
 383 int cleanup_sdt_note_list(struct list_head *sdt_notes);
 384 int sdt_notes__get_count(struct list_head *start);
 385
 386 #define SDT_BASE_SCN ".stapsdt.base"
 387 #define SDT_NOTE_SCN  ".note.stapsdt"
 388 #define SDT_NOTE_TYPE 3
 389 #define SDT_NOTE_NAME "stapsdt"
 390 #define NR_ADDR 3
 391
 392 #endif /* __PERF_SYMBOL */