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 <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 */