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