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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 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 void arch__symbols__fixup_end(struct symbol *p, struct symbol *c);
281 int arch__compare_symbol_names(const char *namea, const char *nameb);
282 int arch__compare_symbol_names_n(const char *namea, const char *nameb,
283                                  unsigned int n);
284 int arch__choose_best_symbol(struct symbol *syma, struct symbol *symb);
285 
286 enum symbol_tag_include {
287         SYMBOL_TAG_INCLUDE__NONE = 0,
288         SYMBOL_TAG_INCLUDE__DEFAULT_ONLY
289 };
290 
291 int symbol__match_symbol_name(const char *namea, const char *nameb,
292                               enum symbol_tag_include includes);
293 
294 /* structure containing an SDT note's info */
295 struct sdt_note {
296         char *name;                     /* name of the note*/
297         char *provider;                 /* provider name */
298         char *args;
299         bool bit32;                     /* whether the location is 32 bits? */
300         union {                         /* location, base and semaphore addrs */
301                 Elf64_Addr a64[3];
302                 Elf32_Addr a32[3];
303         } addr;
304         struct list_head note_list;     /* SDT notes' list */
305 };
306 
307 int get_sdt_note_list(struct list_head *head, const char *target);
308 int cleanup_sdt_note_list(struct list_head *sdt_notes);
309 int sdt_notes__get_count(struct list_head *start);
310 
311 #define SDT_PROBES_SCN ".probes"
312 #define SDT_BASE_SCN ".stapsdt.base"
313 #define SDT_NOTE_SCN  ".note.stapsdt"
314 #define SDT_NOTE_TYPE 3
315 #define SDT_NOTE_NAME "stapsdt"
316 #define NR_ADDR 3
317 
318 enum {
319         SDT_NOTE_IDX_LOC = 0,
320         SDT_NOTE_IDX_BASE,
321         SDT_NOTE_IDX_REFCTR,
322 };
323 
324 struct mem_info *mem_info__new(void);
325 struct mem_info *mem_info__get(struct mem_info *mi);
326 void   mem_info__put(struct mem_info *mi);
327 
328 static inline void __mem_info__zput(struct mem_info **mi)
329 {
330         mem_info__put(*mi);
331         *mi = NULL;
332 }
333 
334 #define mem_info__zput(mi) __mem_info__zput(&mi)
335 
336 #endif /* __PERF_SYMBOL */
337 

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