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 <linux/list.h>
   9 #include <linux/rbtree.h>
  10 #include <stdio.h>
  11 #include "map_symbol.h"
  12 #include "branch.h"
  13 #include "path.h"
  14 #include "symbol_conf.h"
  15
  16 #ifdef HAVE_LIBELF_SUPPORT
  17 #include <libelf.h>
  18 #include <gelf.h>
  19 #endif
  20 #include <elf.h>
  21
  22 #include "dso.h"
  23
  24 struct map;
  25 struct map_groups;
  26 struct option;
  27
  28 /*
  29  * libelf 0.8.x and earlier do not support ELF_C_READ_MMAP;
  30  * for newer versions we can use mmap to reduce memory usage:
  31  */
  32 #ifdef HAVE_LIBELF_MMAP_SUPPORT
  33 # define PERF_ELF_C_READ_MMAP ELF_C_READ_MMAP
  34 #else
  35 # define PERF_ELF_C_READ_MMAP ELF_C_READ
  36 #endif
  37
  38 #ifdef HAVE_LIBELF_SUPPORT
  39 Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
  40                              GElf_Shdr *shp, const char *name, size_t *idx);
  41 #endif
  42
  43 #ifndef DMGL_PARAMS
  44 #define DMGL_NO_OPTS     0              /* For readability... */
  45 #define DMGL_PARAMS      (1 << 0)       /* Include function args */
  46 #define DMGL_ANSI        (1 << 1)       /* Include const, volatile, etc */
  47 #endif
  48
  49 #define DSO__NAME_KALLSYMS      "[kernel.kallsyms]"
  50 #define DSO__NAME_KCORE         "[kernel.kcore]"
  51
  52 /** struct symbol - symtab entry
  53  *
  54  * @ignore - resolvable but tools ignore it (e.g. idle routines)
  55  */
  56 struct symbol {
  57         struct rb_node  rb_node;
  58         u64             start;
  59         u64             end;
  60         u16             namelen;
  61         u8              type:4;
  62         u8              binding:4;
  63         u8              idle:1;
  64         u8              ignore:1;
  65         u8              inlined:1;
  66         u8              arch_sym;
  67         bool            annotate2;
  68         char            name[0];
  69 };
  70
  71 void symbol__delete(struct symbol *sym);
  72 void symbols__delete(struct rb_root_cached *symbols);
  73
  74 /* symbols__for_each_entry - iterate over symbols (rb_root)
  75  *
  76  * @symbols: the rb_root of symbols
  77  * @pos: the 'struct symbol *' to use as a loop cursor
  78  * @nd: the 'struct rb_node *' to use as a temporary storage
  79  */
  80 #define symbols__for_each_entry(symbols, pos, nd)                       \
  81         for (nd = rb_first_cached(symbols);                                     \
  82              nd && (pos = rb_entry(nd, struct symbol, rb_node));        \
  83              nd = rb_next(nd))
  84
  85 static inline size_t symbol__size(const struct symbol *sym)
  86 {
  87         return sym->end - sym->start;
  88 }
  89
  90 struct strlist;
  91 struct intlist;
  92
  93 struct symbol_name_rb_node {
  94         struct rb_node  rb_node;
  95         struct symbol   sym;
  96 };
  97
  98 static inline int __symbol__join_symfs(char *bf, size_t size, const char *path)
  99 {
 100         return path__join(bf, size, symbol_conf.symfs, path);
 101 }
 102
 103 #define symbol__join_symfs(bf, path) __symbol__join_symfs(bf, sizeof(bf), path)
 104
 105 extern int vmlinux_path__nr_entries;
 106 extern char **vmlinux_path;
 107
 108 static inline void *symbol__priv(struct symbol *sym)
 109 {
 110         return ((void *)sym) - symbol_conf.priv_size;
 111 }
 112
 113 struct ref_reloc_sym {
 114         const char      *name;
 115         u64             addr;
 116         u64             unrelocated_addr;
 117 };
 118
 119 struct branch_info {
 120         struct addr_map_symbol from;
 121         struct addr_map_symbol to;
 122         struct branch_flags flags;
 123         char                    *srcline_from;
 124         char                    *srcline_to;
 125 };
 126
 127 struct mem_info {
 128         struct addr_map_symbol  iaddr;
 129         struct addr_map_symbol  daddr;
 130         union perf_mem_data_src data_src;
 131         refcount_t              refcnt;
 132 };
 133
 134 struct addr_location {
 135         struct machine *machine;
 136         struct thread *thread;
 137         struct map    *map;
 138         struct symbol *sym;
 139         const char    *srcline;
 140         u64           addr;
 141         char          level;
 142         u8            filtered;
 143         u8            cpumode;
 144         s32           cpu;
 145         s32           socket;
 146 };
 147
 148 struct symsrc {
 149         char *name;
 150         int fd;
 151         enum dso_binary_type type;
 152
 153 #ifdef HAVE_LIBELF_SUPPORT
 154         Elf *elf;
 155         GElf_Ehdr ehdr;
 156
 157         Elf_Scn *opdsec;
 158         size_t opdidx;
 159         GElf_Shdr opdshdr;
 160
 161         Elf_Scn *symtab;
 162         GElf_Shdr symshdr;
 163
 164         Elf_Scn *dynsym;
 165         size_t dynsym_idx;
 166         GElf_Shdr dynshdr;
 167
 168         bool adjust_symbols;
 169         bool is_64_bit;
 170 #endif
 171 };
 172
 173 void symsrc__destroy(struct symsrc *ss);
 174 int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
 175                  enum dso_binary_type type);
 176 bool symsrc__has_symtab(struct symsrc *ss);
 177 bool symsrc__possibly_runtime(struct symsrc *ss);
 178
 179 int dso__load(struct dso *dso, struct map *map);
 180 int dso__load_vmlinux(struct dso *dso, struct map *map,
 181                       const char *vmlinux, bool vmlinux_allocated);
 182 int dso__load_vmlinux_path(struct dso *dso, struct map *map);
 183 int __dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map,
 184                          bool no_kcore);
 185 int dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map);
 186
 187 void dso__insert_symbol(struct dso *dso,
 188                         struct symbol *sym);
 189
 190 struct symbol *dso__find_symbol(struct dso *dso, u64 addr);
 191 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name);
 192
 193 struct symbol *symbol__next_by_name(struct symbol *sym);
 194
 195 struct symbol *dso__first_symbol(struct dso *dso);
 196 struct symbol *dso__last_symbol(struct dso *dso);
 197 struct symbol *dso__next_symbol(struct symbol *sym);
 198
 199 enum dso_type dso__type_fd(int fd);
 200
 201 int filename__read_build_id(const char *filename, void *bf, size_t size);
 202 int sysfs__read_build_id(const char *filename, void *bf, size_t size);
 203 int modules__parse(const char *filename, void *arg,
 204                    int (*process_module)(void *arg, const char *name,
 205                                          u64 start, u64 size));
 206 int filename__read_debuglink(const char *filename, char *debuglink,
 207                              size_t size);
 208
 209 struct perf_env;
 210 int symbol__init(struct perf_env *env);
 211 void symbol__exit(void);
 212 void symbol__elf_init(void);
 213 int symbol__annotation_init(void);
 214
 215 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name);
 216 size_t __symbol__fprintf_symname_offs(const struct symbol *sym,
 217                                       const struct addr_location *al,
 218                                       bool unknown_as_addr,
 219                                       bool print_offsets, FILE *fp);
 220 size_t symbol__fprintf_symname_offs(const struct symbol *sym,
 221                                     const struct addr_location *al, FILE *fp);
 222 size_t __symbol__fprintf_symname(const struct symbol *sym,
 223                                  const struct addr_location *al,
 224                                  bool unknown_as_addr, FILE *fp);
 225 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp);
 226 size_t symbol__fprintf(struct symbol *sym, FILE *fp);
 227 bool symbol__restricted_filename(const char *filename,
 228                                  const char *restricted_filename);
 229 int symbol__config_symfs(const struct option *opt __maybe_unused,
 230                          const char *dir, int unset __maybe_unused);
 231
 232 int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss,
 233                   struct symsrc *runtime_ss, int kmodule);
 234 int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss);
 235
 236 char *dso__demangle_sym(struct dso *dso, int kmodule, const char *elf_name);
 237
 238 void __symbols__insert(struct rb_root_cached *symbols, struct symbol *sym,
 239                        bool kernel);
 240 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym);
 241 void symbols__fixup_duplicate(struct rb_root_cached *symbols);
 242 void symbols__fixup_end(struct rb_root_cached *symbols);
 243 void map_groups__fixup_end(struct map_groups *mg);
 244
 245 typedef int (*mapfn_t)(u64 start, u64 len, u64 pgoff, void *data);
 246 int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data,
 247                     bool *is_64_bit);
 248
 249 #define PERF_KCORE_EXTRACT "/tmp/perf-kcore-XXXXXX"
 250
 251 struct kcore_extract {
 252         char *kcore_filename;
 253         u64 addr;
 254         u64 offs;
 255         u64 len;
 256         char extract_filename[sizeof(PERF_KCORE_EXTRACT)];
 257         int fd;
 258 };
 259
 260 int kcore_extract__create(struct kcore_extract *kce);
 261 void kcore_extract__delete(struct kcore_extract *kce);
 262
 263 int kcore_copy(const char *from_dir, const char *to_dir);
 264 int compare_proc_modules(const char *from, const char *to);
 265
 266 int setup_list(struct strlist **list, const char *list_str,
 267                const char *list_name);
 268 int setup_intlist(struct intlist **list, const char *list_str,
 269                   const char *list_name);
 270
 271 #ifdef HAVE_LIBELF_SUPPORT
 272 bool elf__needs_adjust_symbols(GElf_Ehdr ehdr);
 273 void arch__sym_update(struct symbol *s, GElf_Sym *sym);
 274 #endif
 275
 276 const char *arch__normalize_symbol_name(const char *name);
 277 #define SYMBOL_A 0
 278 #define SYMBOL_B 1
 279
 280 int arch__compare_symbol_names(const char *namea, const char *nameb);
 281 int arch__compare_symbol_names_n(const char *namea, const char *nameb,
 282                                  unsigned int n);
 283 int arch__choose_best_symbol(struct symbol *syma, struct symbol *symb);
 284
 285 enum symbol_tag_include {
 286         SYMBOL_TAG_INCLUDE__NONE = 0,
 287         SYMBOL_TAG_INCLUDE__DEFAULT_ONLY
 288 };
 289
 290 int symbol__match_symbol_name(const char *namea, const char *nameb,
 291                               enum symbol_tag_include includes);
 292
 293 /* structure containing an SDT note's info */
 294 struct sdt_note {
 295         char *name;                     /* name of the note*/
 296         char *provider;                 /* provider name */
 297         char *args;
 298         bool bit32;                     /* whether the location is 32 bits? */
 299         union {                         /* location, base and semaphore addrs */
 300                 Elf64_Addr a64[3];
 301                 Elf32_Addr a32[3];
 302         } addr;
 303         struct list_head note_list;     /* SDT notes' list */
 304 };
 305
 306 int get_sdt_note_list(struct list_head *head, const char *target);
 307 int cleanup_sdt_note_list(struct list_head *sdt_notes);
 308 int sdt_notes__get_count(struct list_head *start);
 309
 310 #define SDT_PROBES_SCN ".probes"
 311 #define SDT_BASE_SCN ".stapsdt.base"
 312 #define SDT_NOTE_SCN  ".note.stapsdt"
 313 #define SDT_NOTE_TYPE 3
 314 #define SDT_NOTE_NAME "stapsdt"
 315 #define NR_ADDR 3
 316
 317 enum {
 318         SDT_NOTE_IDX_LOC = 0,
 319         SDT_NOTE_IDX_BASE,
 320         SDT_NOTE_IDX_REFCTR,
 321 };
 322
 323 struct mem_info *mem_info__new(void);
 324 struct mem_info *mem_info__get(struct mem_info *mi);
 325 void   mem_info__put(struct mem_info *mi);
 326
 327 static inline void __mem_info__zput(struct mem_info **mi)
 328 {
 329         mem_info__put(*mi);
 330         *mi = NULL;
 331 }
 332
 333 #define mem_info__zput(mi) __mem_info__zput(&mi)
 334
 335 #endif /* __PERF_SYMBOL */