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TOMOYO Linux Cross Reference
Linux/tools/perf/util/symbol.h

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  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 block_info {
135         struct symbol           *sym;
136         u64                     start;
137         u64                     end;
138         u64                     cycles;
139         u64                     cycles_aggr;
140         int                     num;
141         int                     num_aggr;
142         refcount_t              refcnt;
143 };
144 
145 struct addr_location {
146         struct machine *machine;
147         struct thread *thread;
148         struct map    *map;
149         struct symbol *sym;
150         const char    *srcline;
151         u64           addr;
152         char          level;
153         u8            filtered;
154         u8            cpumode;
155         s32           cpu;
156         s32           socket;
157 };
158 
159 struct symsrc {
160         char *name;
161         int fd;
162         enum dso_binary_type type;
163 
164 #ifdef HAVE_LIBELF_SUPPORT
165         Elf *elf;
166         GElf_Ehdr ehdr;
167 
168         Elf_Scn *opdsec;
169         size_t opdidx;
170         GElf_Shdr opdshdr;
171 
172         Elf_Scn *symtab;
173         GElf_Shdr symshdr;
174 
175         Elf_Scn *dynsym;
176         size_t dynsym_idx;
177         GElf_Shdr dynshdr;
178 
179         bool adjust_symbols;
180         bool is_64_bit;
181 #endif
182 };
183 
184 void symsrc__destroy(struct symsrc *ss);
185 int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
186                  enum dso_binary_type type);
187 bool symsrc__has_symtab(struct symsrc *ss);
188 bool symsrc__possibly_runtime(struct symsrc *ss);
189 
190 int dso__load(struct dso *dso, struct map *map);
191 int dso__load_vmlinux(struct dso *dso, struct map *map,
192                       const char *vmlinux, bool vmlinux_allocated);
193 int dso__load_vmlinux_path(struct dso *dso, struct map *map);
194 int __dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map,
195                          bool no_kcore);
196 int dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map);
197 
198 void dso__insert_symbol(struct dso *dso,
199                         struct symbol *sym);
200 
201 struct symbol *dso__find_symbol(struct dso *dso, u64 addr);
202 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name);
203 
204 struct symbol *symbol__next_by_name(struct symbol *sym);
205 
206 struct symbol *dso__first_symbol(struct dso *dso);
207 struct symbol *dso__last_symbol(struct dso *dso);
208 struct symbol *dso__next_symbol(struct symbol *sym);
209 
210 enum dso_type dso__type_fd(int fd);
211 
212 int filename__read_build_id(const char *filename, void *bf, size_t size);
213 int sysfs__read_build_id(const char *filename, void *bf, size_t size);
214 int modules__parse(const char *filename, void *arg,
215                    int (*process_module)(void *arg, const char *name,
216                                          u64 start, u64 size));
217 int filename__read_debuglink(const char *filename, char *debuglink,
218                              size_t size);
219 
220 struct perf_env;
221 int symbol__init(struct perf_env *env);
222 void symbol__exit(void);
223 void symbol__elf_init(void);
224 int symbol__annotation_init(void);
225 
226 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name);
227 size_t __symbol__fprintf_symname_offs(const struct symbol *sym,
228                                       const struct addr_location *al,
229                                       bool unknown_as_addr,
230                                       bool print_offsets, FILE *fp);
231 size_t symbol__fprintf_symname_offs(const struct symbol *sym,
232                                     const struct addr_location *al, FILE *fp);
233 size_t __symbol__fprintf_symname(const struct symbol *sym,
234                                  const struct addr_location *al,
235                                  bool unknown_as_addr, FILE *fp);
236 size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp);
237 size_t symbol__fprintf(struct symbol *sym, FILE *fp);
238 bool symbol__restricted_filename(const char *filename,
239                                  const char *restricted_filename);
240 int symbol__config_symfs(const struct option *opt __maybe_unused,
241                          const char *dir, int unset __maybe_unused);
242 
243 int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss,
244                   struct symsrc *runtime_ss, int kmodule);
245 int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss);
246 
247 char *dso__demangle_sym(struct dso *dso, int kmodule, const char *elf_name);
248 
249 void __symbols__insert(struct rb_root_cached *symbols, struct symbol *sym,
250                        bool kernel);
251 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym);
252 void symbols__fixup_duplicate(struct rb_root_cached *symbols);
253 void symbols__fixup_end(struct rb_root_cached *symbols);
254 void map_groups__fixup_end(struct map_groups *mg);
255 
256 typedef int (*mapfn_t)(u64 start, u64 len, u64 pgoff, void *data);
257 int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data,
258                     bool *is_64_bit);
259 
260 #define PERF_KCORE_EXTRACT "/tmp/perf-kcore-XXXXXX"
261 
262 struct kcore_extract {
263         char *kcore_filename;
264         u64 addr;
265         u64 offs;
266         u64 len;
267         char extract_filename[sizeof(PERF_KCORE_EXTRACT)];
268         int fd;
269 };
270 
271 int kcore_extract__create(struct kcore_extract *kce);
272 void kcore_extract__delete(struct kcore_extract *kce);
273 
274 int kcore_copy(const char *from_dir, const char *to_dir);
275 int compare_proc_modules(const char *from, const char *to);
276 
277 int setup_list(struct strlist **list, const char *list_str,
278                const char *list_name);
279 int setup_intlist(struct intlist **list, const char *list_str,
280                   const char *list_name);
281 
282 #ifdef HAVE_LIBELF_SUPPORT
283 bool elf__needs_adjust_symbols(GElf_Ehdr ehdr);
284 void arch__sym_update(struct symbol *s, GElf_Sym *sym);
285 #endif
286 
287 const char *arch__normalize_symbol_name(const char *name);
288 #define SYMBOL_A 0
289 #define SYMBOL_B 1
290 
291 void arch__symbols__fixup_end(struct symbol *p, struct symbol *c);
292 int arch__compare_symbol_names(const char *namea, const char *nameb);
293 int arch__compare_symbol_names_n(const char *namea, const char *nameb,
294                                  unsigned int n);
295 int arch__choose_best_symbol(struct symbol *syma, struct symbol *symb);
296 
297 enum symbol_tag_include {
298         SYMBOL_TAG_INCLUDE__NONE = 0,
299         SYMBOL_TAG_INCLUDE__DEFAULT_ONLY
300 };
301 
302 int symbol__match_symbol_name(const char *namea, const char *nameb,
303                               enum symbol_tag_include includes);
304 
305 /* structure containing an SDT note's info */
306 struct sdt_note {
307         char *name;                     /* name of the note*/
308         char *provider;                 /* provider name */
309         char *args;
310         bool bit32;                     /* whether the location is 32 bits? */
311         union {                         /* location, base and semaphore addrs */
312                 Elf64_Addr a64[3];
313                 Elf32_Addr a32[3];
314         } addr;
315         struct list_head note_list;     /* SDT notes' list */
316 };
317 
318 int get_sdt_note_list(struct list_head *head, const char *target);
319 int cleanup_sdt_note_list(struct list_head *sdt_notes);
320 int sdt_notes__get_count(struct list_head *start);
321 
322 #define SDT_PROBES_SCN ".probes"
323 #define SDT_BASE_SCN ".stapsdt.base"
324 #define SDT_NOTE_SCN  ".note.stapsdt"
325 #define SDT_NOTE_TYPE 3
326 #define SDT_NOTE_NAME "stapsdt"
327 #define NR_ADDR 3
328 
329 enum {
330         SDT_NOTE_IDX_LOC = 0,
331         SDT_NOTE_IDX_BASE,
332         SDT_NOTE_IDX_REFCTR,
333 };
334 
335 struct mem_info *mem_info__new(void);
336 struct mem_info *mem_info__get(struct mem_info *mi);
337 void   mem_info__put(struct mem_info *mi);
338 
339 static inline void __mem_info__zput(struct mem_info **mi)
340 {
341         mem_info__put(*mi);
342         *mi = NULL;
343 }
344 
345 #define mem_info__zput(mi) __mem_info__zput(&mi)
346 
347 struct block_info *block_info__new(void);
348 struct block_info *block_info__get(struct block_info *bi);
349 void   block_info__put(struct block_info *bi);
350 
351 static inline void __block_info__zput(struct block_info **bi)
352 {
353         block_info__put(*bi);
354         *bi = NULL;
355 }
356 
357 #define block_info__zput(bi) __block_info__zput(&bi)
358 
359 #endif /* __PERF_SYMBOL */
360 

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