tools/perf/util/dso.h

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