aboutsummaryrefslogtreecommitdiffstats
path: root/tools/perf/util/dso.h
blob: 52e7101c5609a99e8553d1d95acb5094b5bed146 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PERF_DSO
#define __PERF_DSO

#include <pthread.h>
#include <linux/refcount.h>
#include <linux/types.h>
#include <linux/rbtree.h>
#include <sys/types.h>
#include <stdbool.h>
#include <stdio.h>
#include <linux/bitops.h>
#include "build-id.h"

struct machine;
struct map;
struct perf_env;

#define DSO__NAME_KALLSYMS	"[kernel.kallsyms]"
#define DSO__NAME_KCORE		"[kernel.kcore]"

enum dso_binary_type {
	DSO_BINARY_TYPE__KALLSYMS = 0,
	DSO_BINARY_TYPE__GUEST_KALLSYMS,
	DSO_BINARY_TYPE__VMLINUX,
	DSO_BINARY_TYPE__GUEST_VMLINUX,
	DSO_BINARY_TYPE__JAVA_JIT,
	DSO_BINARY_TYPE__DEBUGLINK,
	DSO_BINARY_TYPE__BUILD_ID_CACHE,
	DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
	DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
	DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
	DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
	DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
	DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
	DSO_BINARY_TYPE__GUEST_KMODULE,
	DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
	DSO_BINARY_TYPE__KCORE,
	DSO_BINARY_TYPE__GUEST_KCORE,
	DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
	DSO_BINARY_TYPE__BPF_PROG_INFO,
	DSO_BINARY_TYPE__BPF_IMAGE,
	DSO_BINARY_TYPE__OOL,
	DSO_BINARY_TYPE__NOT_FOUND,
};

enum dso_space_type {
	DSO_SPACE__USER = 0,
	DSO_SPACE__KERNEL,
	DSO_SPACE__KERNEL_GUEST
};

enum dso_swap_type {
	DSO_SWAP__UNSET,
	DSO_SWAP__NO,
	DSO_SWAP__YES,
};

enum dso_data_status {
	DSO_DATA_STATUS_ERROR	= -1,
	DSO_DATA_STATUS_UNKNOWN	= 0,
	DSO_DATA_STATUS_OK	= 1,
};

enum dso_data_status_seen {
	DSO_DATA_STATUS_SEEN_ITRACE,
};

enum dso_type {
	DSO__TYPE_UNKNOWN,
	DSO__TYPE_64BIT,
	DSO__TYPE_32BIT,
	DSO__TYPE_X32BIT,
};

enum dso_load_errno {
	DSO_LOAD_ERRNO__SUCCESS		= 0,

	/*
	 * Choose an arbitrary negative big number not to clash with standard
	 * errno since SUS requires the errno has distinct positive values.
	 * See 'Issue 6' in the link below.
	 *
	 * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html
	 */
	__DSO_LOAD_ERRNO__START		= -10000,

	DSO_LOAD_ERRNO__INTERNAL_ERROR	= __DSO_LOAD_ERRNO__START,

	/* for symsrc__init() */
	DSO_LOAD_ERRNO__INVALID_ELF,
	DSO_LOAD_ERRNO__CANNOT_READ_BUILDID,
	DSO_LOAD_ERRNO__MISMATCHING_BUILDID,

	/* for decompress_kmodule */
	DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE,

	__DSO_LOAD_ERRNO__END,
};

#define DSO__SWAP(dso, type, val)			\
({							\
	type ____r = val;				\
	BUG_ON(dso->needs_swap == DSO_SWAP__UNSET);	\
	if (dso->needs_swap == DSO_SWAP__YES) {		\
		switch (sizeof(____r)) {		\
		case 2:					\
			____r = bswap_16(val);		\
			break;				\
		case 4:					\
			____r = bswap_32(val);		\
			break;				\
		case 8:					\
			____r = bswap_64(val);		\
			break;				\
		default:				\
			BUG_ON(1);			\
		}					\
	}						\
	____r;						\
})

#define DSO__DATA_CACHE_SIZE 4096
#define DSO__DATA_CACHE_MASK ~(DSO__DATA_CACHE_SIZE - 1)

/*
 * Data about backing storage DSO, comes from PERF_RECORD_MMAP2 meta events
 */
struct dso_id {
	u32	maj;
	u32	min;
	u64	ino;
	u64	ino_generation;
};

struct dso_cache {
	struct rb_node	rb_node;
	u64 offset;
	u64 size;
	char data[];
};

struct auxtrace_cache;

struct dso {
	pthread_mutex_t	 lock;
	struct list_head node;
	struct rb_node	 rb_node;	/* rbtree node sorted by long name */
	struct rb_root	 *root;		/* root of rbtree that rb_node is in */
	struct rb_root_cached symbols;
	struct rb_root_cached symbol_names;
	struct rb_root_cached inlined_nodes;
	struct rb_root_cached srclines;
	struct {
		u64		addr;
		struct symbol	*symbol;
	} last_find_result;
	void		 *a2l;
	char		 *symsrc_filename;
	unsigned int	 a2l_fails;
	enum dso_space_type	kernel;
	enum dso_swap_type	needs_swap;
	enum dso_binary_type	symtab_type;
	enum dso_binary_type	binary_type;
	enum dso_load_errno	load_errno;
	u8		 adjust_symbols:1;
	u8		 has_build_id:1;
	u8		 has_srcline:1;
	u8		 hit:1;
	u8		 annotate_warned:1;
	u8		 short_name_allocated:1;
	u8		 long_name_allocated:1;
	u8		 is_64_bit:1;
	bool		 sorted_by_name;
	bool		 loaded;
	u8		 rel;
	struct build_id	 bid;
	u64		 text_offset;
	const char	 *short_name;
	const char	 *long_name;
	u16		 long_name_len;
	u16		 short_name_len;
	void		*dwfl;			/* DWARF debug info */
	struct auxtrace_cache *auxtrace_cache;
	int		 comp;

	/* dso data file */
	struct {
		struct rb_root	 cache;
		int		 fd;
		int		 status;
		u32		 status_seen;
		size_t		 file_size;
		struct list_head open_entry;
		u64		 debug_frame_offset;
		u64		 eh_frame_hdr_offset;
	} data;
	/* bpf prog information */
	struct {
		u32		id;
		u32		sub_id;
		struct perf_env	*env;
	} bpf_prog;

	union { /* Tool specific area */
		void	 *priv;
		u64	 db_id;
	};
	struct nsinfo	*nsinfo;
	struct dso_id	 id;
	refcount_t	 refcnt;
	char		 name[];
};

/* dso__for_each_symbol - iterate over the symbols of given type
 *
 * @dso: the 'struct dso *' in which symbols are iterated
 * @pos: the 'struct symbol *' to use as a loop cursor
 * @n: the 'struct rb_node *' to use as a temporary storage
 */
#define dso__for_each_symbol(dso, pos, n)	\
	symbols__for_each_entry(&(dso)->symbols, pos, n)

static inline void dso__set_loaded(struct dso *dso)
{
	dso->loaded = true;
}

struct dso *dso__new_id(const char *name, struct dso_id *id);
struct dso *dso__new(const char *name);
void dso__delete(struct dso *dso);

int dso__cmp_id(struct dso *a, struct dso *b);
void dso__set_short_name(struct dso *dso, const char *name, bool name_allocated);
void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated);

int dso__name_len(const struct dso *dso);

struct dso *dso__get(struct dso *dso);
void dso__put(struct dso *dso);

static inline void __dso__zput(struct dso **dso)
{
	dso__put(*dso);
	*dso = NULL;
}

#define dso__zput(dso) __dso__zput(&dso)

bool dso__loaded(const struct dso *dso);

static inline bool dso__has_symbols(const struct dso *dso)
{
	return !RB_EMPTY_ROOT(&dso->symbols.rb_root);
}

bool dso__sorted_by_name(const struct dso *dso);
void dso__set_sorted_by_name(struct dso *dso);
void dso__sort_by_name(struct dso *dso);

void dso__set_build_id(struct dso *dso, struct build_id *bid);
bool dso__build_id_equal(const struct dso *dso, struct build_id *bid);
void dso__read_running_kernel_build_id(struct dso *dso,
				       struct machine *machine);
int dso__kernel_module_get_build_id(struct dso *dso, const char *root_dir);

char dso__symtab_origin(const struct dso *dso);
int dso__read_binary_type_filename(const struct dso *dso, enum dso_binary_type type,
				   char *root_dir, char *filename, size_t size);
bool is_kernel_module(const char *pathname, int cpumode);
bool dso__needs_decompress(struct dso *dso);
int dso__decompress_kmodule_fd(struct dso *dso, const char *name);
int dso__decompress_kmodule_path(struct dso *dso, const char *name,
				 char *pathname, size_t len);
int filename__decompress(const char *name, char *pathname,
			 size_t len, int comp, int *err);

#define KMOD_DECOMP_NAME  "/tmp/perf-kmod-XXXXXX"
#define KMOD_DECOMP_LEN   sizeof(KMOD_DECOMP_NAME)

struct kmod_path {
	char *name;
	int   comp;
	bool  kmod;
};

int __kmod_path__parse(struct kmod_path *m, const char *path,
		     bool alloc_name);

#define kmod_path__parse(__m, __p)      __kmod_path__parse(__m, __p, false)
#define kmod_path__parse_name(__m, __p) __kmod_path__parse(__m, __p, true)

void dso__set_module_info(struct dso *dso, struct kmod_path *m,
			  struct machine *machine);

/*
 * The dso__data_* external interface provides following functions:
 *   dso__data_get_fd
 *   dso__data_put_fd
 *   dso__data_close
 *   dso__data_size
 *   dso__data_read_offset
 *   dso__data_read_addr
 *   dso__data_write_cache_offs
 *   dso__data_write_cache_addr
 *
 * Please refer to the dso.c object code for each function and
 * arguments documentation. Following text tries to explain the
 * dso file descriptor caching.
 *
 * The dso__data* interface allows caching of opened file descriptors
 * to speed up the dso data accesses. The idea is to leave the file
 * descriptor opened ideally for the whole life of the dso object.
 *
 * The current usage of the dso__data_* interface is as follows:
 *
 * Get DSO's fd:
 *   int fd = dso__data_get_fd(dso, machine);
 *   if (fd >= 0) {
 *       USE 'fd' SOMEHOW
 *       dso__data_put_fd(dso);
 *   }
 *
 * Read DSO's data:
 *   n = dso__data_read_offset(dso_0, &machine, 0, buf, BUFSIZE);
 *   n = dso__data_read_addr(dso_0, &machine, 0, buf, BUFSIZE);
 *
 * Eventually close DSO's fd:
 *   dso__data_close(dso);
 *
 * It is not necessary to close the DSO object data file. Each time new
 * DSO data file is opened, the limit (RLIMIT_NOFILE/2) is checked. Once
 * it is crossed, the oldest opened DSO object is closed.
 *
 * The dso__delete function calls close_dso function to ensure the
 * data file descriptor gets closed/unmapped before the dso object
 * is freed.
 *
 * TODO
*/
int dso__data_get_fd(struct dso *dso, struct machine *machine);
void dso__data_put_fd(struct dso *dso);
void dso__data_close(struct dso *dso);

int dso__data_file_size(struct dso *dso, struct machine *machine);
off_t dso__data_size(struct dso *dso, struct machine *machine);
ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
			      u64 offset, u8 *data, ssize_t size);
ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
			    struct machine *machine, u64 addr,
			    u8 *data, ssize_t size);
bool dso__data_status_seen(struct dso *dso, enum dso_data_status_seen by);
ssize_t dso__data_write_cache_offs(struct dso *dso, struct machine *machine,
				   u64 offset, const u8 *data, ssize_t size);
ssize_t dso__data_write_cache_addr(struct dso *dso, struct map *map,
				   struct machine *machine, u64 addr,
				   const u8 *data, ssize_t size);

struct map *dso__new_map(const char *name);
struct dso *machine__findnew_kernel(struct machine *machine, const char *name,
				    const char *short_name, int dso_type);

void dso__reset_find_symbol_cache(struct dso *dso);

size_t dso__fprintf_symbols_by_name(struct dso *dso, FILE *fp);
size_t dso__fprintf(struct dso *dso, FILE *fp);

static inline bool dso__is_vmlinux(struct dso *dso)
{
	return dso->binary_type == DSO_BINARY_TYPE__VMLINUX ||
	       dso->binary_type == DSO_BINARY_TYPE__GUEST_VMLINUX;
}

static inline bool dso__is_kcore(struct dso *dso)
{
	return dso->binary_type == DSO_BINARY_TYPE__KCORE ||
	       dso->binary_type == DSO_BINARY_TYPE__GUEST_KCORE;
}

static inline bool dso__is_kallsyms(struct dso *dso)
{
	return dso->kernel && dso->long_name[0] != '/';
}

void dso__free_a2l(struct dso *dso);

enum dso_type dso__type(struct dso *dso, struct machine *machine);

int dso__strerror_load(struct dso *dso, char *buf, size_t buflen);

void reset_fd_limit(void);

#endif /* __PERF_DSO */