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