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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 "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 */
393 

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