dso.h

Go to the documentation of this file.

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PERF_DSO
#define __PERF_DSO

#include <linux/refcount.h>
#include <linux/types.h>
#include <linux/rbtree.h>
#include <sys/types.h>
#include <stdbool.h>
#include "rwsem.h"
#include <linux/types.h>
#include <linux/bitops.h>
#include "map.h"
#include "namespaces.h"
#include "build-id.h"

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__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__NOT_FOUND,
};

enum dso_kernel_type {
    DSO_TYPE_USER = 0,
    DSO_TYPE_KERNEL,
    DSO_TYPE_GUEST_KERNEL
};

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)

struct dso_cache {
    struct rb_node  rb_node;
    u64 offset;
    u64 size;
    char data[0];
};

/*
 * DSOs are put into both a list for fast iteration and rbtree for fast
 * long name lookup.
 */
struct dsos {
    struct list_head head;
    struct rb_root   root;  /* rbtree root sorted by long name */
    struct rw_semaphore lock;
};

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   symbols;
    struct rb_root   symbol_names;
    struct rb_root   inlined_nodes;
    struct rb_root   srclines;
    struct {
        u64     addr;
        struct symbol   *symbol;
    } last_find_result;
    void         *a2l;
    char         *symsrc_filename;
    unsigned int     a2l_fails;
    enum dso_kernel_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;
    u8       build_id[BUILD_ID_SIZE];
    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;

    /* 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;

    union { /* Tool specific area */
        void     *priv;
        u64  db_id;
    };
    struct nsinfo   *nsinfo;
    refcount_t   refcnt;
    char         name[0];
};

/* dso__for_each_symbol - iterate over the symbols of given type
 *
 * @dso: the 'struct dso *' in which symbols itereated
 * @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(const char *name);
void dso__delete(struct dso *dso);

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);
}

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, void *build_id);
bool dso__build_id_equal(const struct dso *dso, u8 *build_id);
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_supported_compression(const char *ext);
bool is_kernel_module(const char *pathname, int cpumode);
bool decompress_to_file(const char *ext, const char *filename, int output_fd);
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);

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

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

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

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

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);

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 __dsos__add(struct dsos *dsos, struct dso *dso);
void dsos__add(struct dsos *dsos, struct dso *dso);
struct dso *__dsos__addnew(struct dsos *dsos, const char *name);
struct dso *__dsos__find(struct dsos *dsos, const char *name, bool cmp_short);
struct dso *dsos__find(struct dsos *dsos, const char *name, bool cmp_short);
struct dso *__dsos__findnew(struct dsos *dsos, const char *name);
struct dso *dsos__findnew(struct dsos *dsos, const char *name);
bool __dsos__read_build_ids(struct list_head *head, bool with_hits);

void dso__reset_find_symbol_cache(struct dso *dso);

size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
                   bool (skip)(struct dso *dso, int parm), int parm);
size_t __dsos__fprintf(struct list_head *head, FILE *fp);

size_t dso__fprintf_buildid(struct dso *dso, FILE *fp);
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 */