tools/perf/util/dso.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __PERF_DSO
   3 #define __PERF_DSO
   4
   5 #include <pthread.h>
   6 #include <linux/refcount.h>
   7 #include <linux/types.h>
   8 #include <linux/rbtree.h>
   9 #include <sys/types.h>
  10 #include <stdbool.h>
  11 #include <stdio.h>
  12 #include <linux/bitops.h>
  13 #include "build-id.h"
  14
  15 struct machine;
  16 struct map;
  17 struct perf_env;
  18
  19 #define DSO__NAME_KALLSYMS      "[kernel.kallsyms]"
  20 #define DSO__NAME_KCORE         "[kernel.kcore]"
  21
  22 enum dso_binary_type {
  23         DSO_BINARY_TYPE__KALLSYMS = 0,
  24         DSO_BINARY_TYPE__GUEST_KALLSYMS,
  25         DSO_BINARY_TYPE__VMLINUX,
  26         DSO_BINARY_TYPE__GUEST_VMLINUX,
  27         DSO_BINARY_TYPE__JAVA_JIT,
  28         DSO_BINARY_TYPE__DEBUGLINK,
  29         DSO_BINARY_TYPE__BUILD_ID_CACHE,
  30         DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
  31         DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
  32         DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
  33         DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
  34         DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
  35         DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
  36         DSO_BINARY_TYPE__GUEST_KMODULE,
  37         DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
  38         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
  39         DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
  40         DSO_BINARY_TYPE__KCORE,
  41         DSO_BINARY_TYPE__GUEST_KCORE,
  42         DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
  43         DSO_BINARY_TYPE__BPF_PROG_INFO,
  44         DSO_BINARY_TYPE__BPF_IMAGE,
  45         DSO_BINARY_TYPE__OOL,
  46         DSO_BINARY_TYPE__NOT_FOUND,
  47 };
  48
  49 enum dso_space_type {
  50         DSO_SPACE__USER = 0,
  51         DSO_SPACE__KERNEL,
  52         DSO_SPACE__KERNEL_GUEST
  53 };
  54
  55 enum dso_swap_type {
  56         DSO_SWAP__UNSET,
  57         DSO_SWAP__NO,
  58         DSO_SWAP__YES,
  59 };
  60
  61 enum dso_data_status {
  62         DSO_DATA_STATUS_ERROR   = -1,
  63         DSO_DATA_STATUS_UNKNOWN = 0,
  64         DSO_DATA_STATUS_OK      = 1,
  65 };
  66
  67 enum dso_data_status_seen {
  68         DSO_DATA_STATUS_SEEN_ITRACE,
  69 };
  70
  71 enum dso_type {
  72         DSO__TYPE_UNKNOWN,
  73         DSO__TYPE_64BIT,
  74         DSO__TYPE_32BIT,
  75         DSO__TYPE_X32BIT,
  76 };
  77
  78 enum dso_load_errno {
  79         DSO_LOAD_ERRNO__SUCCESS         = 0,
  80
  81         /*
  82          * Choose an arbitrary negative big number not to clash with standard
  83          * errno since SUS requires the errno has distinct positive values.
  84          * See 'Issue 6' in the link below.
  85          *
  86          * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html
  87          */
  88         __DSO_LOAD_ERRNO__START         = -10000,
  89
  90         DSO_LOAD_ERRNO__INTERNAL_ERROR  = __DSO_LOAD_ERRNO__START,
  91
  92         /* for symsrc__init() */
  93         DSO_LOAD_ERRNO__INVALID_ELF,
  94         DSO_LOAD_ERRNO__CANNOT_READ_BUILDID,
  95         DSO_LOAD_ERRNO__MISMATCHING_BUILDID,
  96
  97         /* for decompress_kmodule */
  98         DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE,
  99
 100         __DSO_LOAD_ERRNO__END,
 101 };
 102
 103 #define DSO__SWAP(dso, type, val)                       \
 104 ({                                                      \
 105         type ____r = val;                               \
 106         BUG_ON(dso->needs_swap == DSO_SWAP__UNSET);     \
 107         if (dso->needs_swap == DSO_SWAP__YES) {         \
 108                 switch (sizeof(____r)) {                \
 109                 case 2:                                 \
 110                         ____r = bswap_16(val);          \
 111                         break;                          \
 112                 case 4:                                 \
 113                         ____r = bswap_32(val);          \
 114                         break;                          \
 115                 case 8:                                 \
 116                         ____r = bswap_64(val);          \
 117                         break;                          \
 118                 default:                                \
 119                         BUG_ON(1);                      \
 120                 }                                       \
 121         }                                               \
 122         ____r;                                          \
 123 })
 124
 125 #define DSO__DATA_CACHE_SIZE 4096
 126 #define DSO__DATA_CACHE_MASK ~(DSO__DATA_CACHE_SIZE - 1)
 127
 128 /*
 129  * Data about backing storage DSO, comes from PERF_RECORD_MMAP2 meta events
 130  */
 131 struct dso_id {
 132         u32     maj;
 133         u32     min;
 134         u64     ino;
 135         u64     ino_generation;
 136 };
 137
 138 struct dso_cache {
 139         struct rb_node  rb_node;
 140         u64 offset;
 141         u64 size;
 142         char data[];
 143 };
 144
 145 struct auxtrace_cache;
 146
 147 struct dso {
 148         pthread_mutex_t  lock;
 149         struct list_head node;
 150         struct rb_node   rb_node;       /* rbtree node sorted by long name */
 151         struct rb_root   *root;         /* root of rbtree that rb_node is in */
 152         struct rb_root_cached symbols;
 153         struct rb_root_cached symbol_names;
 154         struct rb_root_cached inlined_nodes;
 155         struct rb_root_cached srclines;
 156         struct {
 157                 u64             addr;
 158                 struct symbol   *symbol;
 159         } last_find_result;
 160         void             *a2l;
 161         char             *symsrc_filename;
 162         unsigned int     a2l_fails;
 163         enum dso_space_type     kernel;
 164         enum dso_swap_type      needs_swap;
 165         enum dso_binary_type    symtab_type;
 166         enum dso_binary_type    binary_type;
 167         enum dso_load_errno     load_errno;
 168         u8               adjust_symbols:1;
 169         u8               has_build_id:1;
 170         u8               has_srcline:1;
 171         u8               hit:1;
 172         u8               annotate_warned:1;
 173         u8               short_name_allocated:1;
 174         u8               long_name_allocated:1;
 175         u8               is_64_bit:1;
 176         bool             sorted_by_name;
 177         bool             loaded;
 178         u8               rel;
 179         struct build_id  bid;
 180         u64              text_offset;
 181         const char       *short_name;
 182         const char       *long_name;
 183         u16              long_name_len;
 184         u16              short_name_len;
 185         void            *dwfl;                  /* DWARF debug info */
 186         struct auxtrace_cache *auxtrace_cache;
 187         int              comp;
 188
 189         /* dso data file */
 190         struct {
 191                 struct rb_root   cache;
 192                 int              fd;
 193                 int              status;
 194                 u32              status_seen;
 195                 size_t           file_size;
 196                 struct list_head open_entry;
 197                 u64              debug_frame_offset;
 198                 u64              eh_frame_hdr_offset;
 199         } data;
 200         /* bpf prog information */
 201         struct {
 202                 u32             id;
 203                 u32             sub_id;
 204                 struct perf_env *env;
 205         } bpf_prog;
 206
 207         union { /* Tool specific area */
 208                 void     *priv;
 209                 u64      db_id;
 210         };
 211         struct nsinfo   *nsinfo;
 212         struct dso_id    id;
 213         refcount_t       refcnt;
 214         char             name[];
 215 };
 216
 217 /* dso__for_each_symbol - iterate over the symbols of given type
 218  *
 219  * @dso: the 'struct dso *' in which symbols itereated
 220  * @pos: the 'struct symbol *' to use as a loop cursor
 221  * @n: the 'struct rb_node *' to use as a temporary storage
 222  */
 223 #define dso__for_each_symbol(dso, pos, n)       \
 224         symbols__for_each_entry(&(dso)->symbols, pos, n)
 225
 226 static inline void dso__set_loaded(struct dso *dso)
 227 {
 228         dso->loaded = true;
 229 }
 230
 231 struct dso *dso__new_id(const char *name, struct dso_id *id);
 232 struct dso *dso__new(const char *name);
 233 void dso__delete(struct dso *dso);
 234
 235 int dso__cmp_id(struct dso *a, struct dso *b);
 236 void dso__set_short_name(struct dso *dso, const char *name, bool name_allocated);
 237 void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated);
 238
 239 int dso__name_len(const struct dso *dso);
 240
 241 struct dso *dso__get(struct dso *dso);
 242 void dso__put(struct dso *dso);
 243
 244 static inline void __dso__zput(struct dso **dso)
 245 {
 246         dso__put(*dso);
 247         *dso = NULL;
 248 }
 249
 250 #define dso__zput(dso) __dso__zput(&dso)
 251
 252 bool dso__loaded(const struct dso *dso);
 253
 254 static inline bool dso__has_symbols(const struct dso *dso)
 255 {
 256         return !RB_EMPTY_ROOT(&dso->symbols.rb_root);
 257 }
 258
 259 bool dso__sorted_by_name(const struct dso *dso);
 260 void dso__set_sorted_by_name(struct dso *dso);
 261 void dso__sort_by_name(struct dso *dso);
 262
 263 void dso__set_build_id(struct dso *dso, struct build_id *bid);
 264 bool dso__build_id_equal(const struct dso *dso, struct build_id *bid);
 265 void dso__read_running_kernel_build_id(struct dso *dso,
 266                                        struct machine *machine);
 267 int dso__kernel_module_get_build_id(struct dso *dso, const char *root_dir);
 268
 269 char dso__symtab_origin(const struct dso *dso);
 270 int dso__read_binary_type_filename(const struct dso *dso, enum dso_binary_type type,
 271                                    char *root_dir, char *filename, size_t size);
 272 bool is_kernel_module(const char *pathname, int cpumode);
 273 bool dso__needs_decompress(struct dso *dso);
 274 int dso__decompress_kmodule_fd(struct dso *dso, const char *name);
 275 int dso__decompress_kmodule_path(struct dso *dso, const char *name,
 276                                  char *pathname, size_t len);
 277 int filename__decompress(const char *name, char *pathname,
 278                          size_t len, int comp, int *err);
 279
 280 #define KMOD_DECOMP_NAME  "/tmp/perf-kmod-XXXXXX"
 281 #define KMOD_DECOMP_LEN   sizeof(KMOD_DECOMP_NAME)
 282
 283 struct kmod_path {
 284         char *name;
 285         int   comp;
 286         bool  kmod;
 287 };
 288
 289 int __kmod_path__parse(struct kmod_path *m, const char *path,
 290                      bool alloc_name);
 291
 292 #define kmod_path__parse(__m, __p)      __kmod_path__parse(__m, __p, false)
 293 #define kmod_path__parse_name(__m, __p) __kmod_path__parse(__m, __p, true)
 294
 295 void dso__set_module_info(struct dso *dso, struct kmod_path *m,
 296                           struct machine *machine);
 297
 298 /*
 299  * The dso__data_* external interface provides following functions:
 300  *   dso__data_get_fd
 301  *   dso__data_put_fd
 302  *   dso__data_close
 303  *   dso__data_size
 304  *   dso__data_read_offset
 305  *   dso__data_read_addr
 306  *   dso__data_write_cache_offs
 307  *   dso__data_write_cache_addr
 308  *
 309  * Please refer to the dso.c object code for each function and
 310  * arguments documentation. Following text tries to explain the
 311  * dso file descriptor caching.
 312  *
 313  * The dso__data* interface allows caching of opened file descriptors
 314  * to speed up the dso data accesses. The idea is to leave the file
 315  * descriptor opened ideally for the whole life of the dso object.
 316  *
 317  * The current usage of the dso__data_* interface is as follows:
 318  *
 319  * Get DSO's fd:
 320  *   int fd = dso__data_get_fd(dso, machine);
 321  *   if (fd >= 0) {
 322  *       USE 'fd' SOMEHOW
 323  *       dso__data_put_fd(dso);
 324  *   }
 325  *
 326  * Read DSO's data:
 327  *   n = dso__data_read_offset(dso_0, &machine, 0, buf, BUFSIZE);
 328  *   n = dso__data_read_addr(dso_0, &machine, 0, buf, BUFSIZE);
 329  *
 330  * Eventually close DSO's fd:
 331  *   dso__data_close(dso);
 332  *
 333  * It is not necessary to close the DSO object data file. Each time new
 334  * DSO data file is opened, the limit (RLIMIT_NOFILE/2) is checked. Once
 335  * it is crossed, the oldest opened DSO object is closed.
 336  *
 337  * The dso__delete function calls close_dso function to ensure the
 338  * data file descriptor gets closed/unmapped before the dso object
 339  * is freed.
 340  *
 341  * TODO
 342 */
 343 int dso__data_get_fd(struct dso *dso, struct machine *machine);
 344 void dso__data_put_fd(struct dso *dso);
 345 void dso__data_close(struct dso *dso);
 346
 347 int dso__data_file_size(struct dso *dso, struct machine *machine);
 348 off_t dso__data_size(struct dso *dso, struct machine *machine);
 349 ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
 350                               u64 offset, u8 *data, ssize_t size);
 351 ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
 352                             struct machine *machine, u64 addr,
 353                             u8 *data, ssize_t size);
 354 bool dso__data_status_seen(struct dso *dso, enum dso_data_status_seen by);
 355 ssize_t dso__data_write_cache_offs(struct dso *dso, struct machine *machine,
 356                                    u64 offset, const u8 *data, ssize_t size);
 357 ssize_t dso__data_write_cache_addr(struct dso *dso, struct map *map,
 358                                    struct machine *machine, u64 addr,
 359                                    const u8 *data, ssize_t size);
 360
 361 struct map *dso__new_map(const char *name);
 362 struct dso *machine__findnew_kernel(struct machine *machine, const char *name,
 363                                     const char *short_name, int dso_type);
 364
 365 void dso__reset_find_symbol_cache(struct dso *dso);
 366
 367 size_t dso__fprintf_symbols_by_name(struct dso *dso, FILE *fp);
 368 size_t dso__fprintf(struct dso *dso, FILE *fp);
 369
 370 static inline bool dso__is_vmlinux(struct dso *dso)
 371 {
 372         return dso->binary_type == DSO_BINARY_TYPE__VMLINUX ||
 373                dso->binary_type == DSO_BINARY_TYPE__GUEST_VMLINUX;
 374 }
 375
 376 static inline bool dso__is_kcore(struct dso *dso)
 377 {
 378         return dso->binary_type == DSO_BINARY_TYPE__KCORE ||
 379                dso->binary_type == DSO_BINARY_TYPE__GUEST_KCORE;
 380 }
 381
 382 static inline bool dso__is_kallsyms(struct dso *dso)
 383 {
 384         return dso->kernel && dso->long_name[0] != '/';
 385 }
 386
 387 void dso__free_a2l(struct dso *dso);
 388
 389 enum dso_type dso__type(struct dso *dso, struct machine *machine);
 390
 391 int dso__strerror_load(struct dso *dso, char *buf, size_t buflen);
 392
 393 void reset_fd_limit(void);
 394
 395 #endif /* __PERF_DSO */