11 #include <sys/param.h>
24 #include <sys/utsname.h>
27 #define KSYM_NAME_LEN 128
30 #ifndef NT_GNU_BUILD_ID
31 #define NT_GNU_BUILD_ID 3
34 static bool dso__build_id_equal(const struct dso
*self
, u8
*build_id
);
35 static int elf_read_build_id(Elf
*elf
, void *bf
, size_t size
);
36 static void dsos__add(struct list_head
*head
, struct dso
*dso
);
37 static struct map
*map__new2(u64 start
, struct dso
*dso
, enum map_type type
);
38 static int dso__load_kernel_sym(struct dso
*self
, struct map
*map
,
39 symbol_filter_t filter
);
40 static int dso__load_guest_kernel_sym(struct dso
*self
, struct map
*map
,
41 symbol_filter_t filter
);
42 static int vmlinux_path__nr_entries
;
43 static char **vmlinux_path
;
45 struct symbol_conf symbol_conf
= {
46 .exclude_other
= true,
48 .try_vmlinux_path
= true,
52 int dso__name_len(const struct dso
*self
)
55 return self
->long_name_len
;
57 return self
->short_name_len
;
60 bool dso__loaded(const struct dso
*self
, enum map_type type
)
62 return self
->loaded
& (1 << type
);
65 bool dso__sorted_by_name(const struct dso
*self
, enum map_type type
)
67 return self
->sorted_by_name
& (1 << type
);
70 static void dso__set_sorted_by_name(struct dso
*self
, enum map_type type
)
72 self
->sorted_by_name
|= (1 << type
);
75 bool symbol_type__is_a(char symbol_type
, enum map_type map_type
)
79 return symbol_type
== 'T' || symbol_type
== 'W';
81 return symbol_type
== 'D' || symbol_type
== 'd';
87 static void symbols__fixup_end(struct rb_root
*self
)
89 struct rb_node
*nd
, *prevnd
= rb_first(self
);
90 struct symbol
*curr
, *prev
;
95 curr
= rb_entry(prevnd
, struct symbol
, rb_node
);
97 for (nd
= rb_next(prevnd
); nd
; nd
= rb_next(nd
)) {
99 curr
= rb_entry(nd
, struct symbol
, rb_node
);
101 if (prev
->end
== prev
->start
&& prev
->end
!= curr
->start
)
102 prev
->end
= curr
->start
- 1;
106 if (curr
->end
== curr
->start
)
107 curr
->end
= roundup(curr
->start
, 4096);
110 static void __map_groups__fixup_end(struct map_groups
*self
, enum map_type type
)
112 struct map
*prev
, *curr
;
113 struct rb_node
*nd
, *prevnd
= rb_first(&self
->maps
[type
]);
118 curr
= rb_entry(prevnd
, struct map
, rb_node
);
120 for (nd
= rb_next(prevnd
); nd
; nd
= rb_next(nd
)) {
122 curr
= rb_entry(nd
, struct map
, rb_node
);
123 prev
->end
= curr
->start
- 1;
127 * We still haven't the actual symbols, so guess the
128 * last map final address.
133 static void map_groups__fixup_end(struct map_groups
*self
)
136 for (i
= 0; i
< MAP__NR_TYPES
; ++i
)
137 __map_groups__fixup_end(self
, i
);
140 static struct symbol
*symbol__new(u64 start
, u64 len
, u8 binding
,
143 size_t namelen
= strlen(name
) + 1;
144 struct symbol
*self
= calloc(1, (symbol_conf
.priv_size
+
145 sizeof(*self
) + namelen
));
149 if (symbol_conf
.priv_size
)
150 self
= ((void *)self
) + symbol_conf
.priv_size
;
153 self
->end
= len
? start
+ len
- 1 : start
;
154 self
->binding
= binding
;
155 self
->namelen
= namelen
- 1;
157 pr_debug4("%s: %s %#" PRIx64
"-%#" PRIx64
"\n", __func__
, name
, start
, self
->end
);
159 memcpy(self
->name
, name
, namelen
);
164 void symbol__delete(struct symbol
*self
)
166 free(((void *)self
) - symbol_conf
.priv_size
);
169 static size_t symbol__fprintf(struct symbol
*self
, FILE *fp
)
171 return fprintf(fp
, " %" PRIx64
"-%" PRIx64
" %c %s\n",
172 self
->start
, self
->end
,
173 self
->binding
== STB_GLOBAL
? 'g' :
174 self
->binding
== STB_LOCAL
? 'l' : 'w',
178 void dso__set_long_name(struct dso
*self
, char *name
)
182 self
->long_name
= name
;
183 self
->long_name_len
= strlen(name
);
186 static void dso__set_short_name(struct dso
*self
, const char *name
)
190 self
->short_name
= name
;
191 self
->short_name_len
= strlen(name
);
194 static void dso__set_basename(struct dso
*self
)
196 dso__set_short_name(self
, basename(self
->long_name
));
199 struct dso
*dso__new(const char *name
)
201 struct dso
*self
= calloc(1, sizeof(*self
) + strlen(name
) + 1);
205 strcpy(self
->name
, name
);
206 dso__set_long_name(self
, self
->name
);
207 dso__set_short_name(self
, self
->name
);
208 for (i
= 0; i
< MAP__NR_TYPES
; ++i
)
209 self
->symbols
[i
] = self
->symbol_names
[i
] = RB_ROOT
;
210 self
->slen_calculated
= 0;
211 self
->origin
= DSO__ORIG_NOT_FOUND
;
213 self
->sorted_by_name
= 0;
214 self
->has_build_id
= 0;
215 self
->kernel
= DSO_TYPE_USER
;
216 INIT_LIST_HEAD(&self
->node
);
222 static void symbols__delete(struct rb_root
*self
)
225 struct rb_node
*next
= rb_first(self
);
228 pos
= rb_entry(next
, struct symbol
, rb_node
);
229 next
= rb_next(&pos
->rb_node
);
230 rb_erase(&pos
->rb_node
, self
);
235 void dso__delete(struct dso
*self
)
238 for (i
= 0; i
< MAP__NR_TYPES
; ++i
)
239 symbols__delete(&self
->symbols
[i
]);
240 if (self
->sname_alloc
)
241 free((char *)self
->short_name
);
242 if (self
->lname_alloc
)
243 free(self
->long_name
);
247 void dso__set_build_id(struct dso
*self
, void *build_id
)
249 memcpy(self
->build_id
, build_id
, sizeof(self
->build_id
));
250 self
->has_build_id
= 1;
253 static void symbols__insert(struct rb_root
*self
, struct symbol
*sym
)
255 struct rb_node
**p
= &self
->rb_node
;
256 struct rb_node
*parent
= NULL
;
257 const u64 ip
= sym
->start
;
262 s
= rb_entry(parent
, struct symbol
, rb_node
);
268 rb_link_node(&sym
->rb_node
, parent
, p
);
269 rb_insert_color(&sym
->rb_node
, self
);
272 static struct symbol
*symbols__find(struct rb_root
*self
, u64 ip
)
282 struct symbol
*s
= rb_entry(n
, struct symbol
, rb_node
);
286 else if (ip
> s
->end
)
295 struct symbol_name_rb_node
{
296 struct rb_node rb_node
;
300 static void symbols__insert_by_name(struct rb_root
*self
, struct symbol
*sym
)
302 struct rb_node
**p
= &self
->rb_node
;
303 struct rb_node
*parent
= NULL
;
304 struct symbol_name_rb_node
*symn
, *s
;
306 symn
= container_of(sym
, struct symbol_name_rb_node
, sym
);
310 s
= rb_entry(parent
, struct symbol_name_rb_node
, rb_node
);
311 if (strcmp(sym
->name
, s
->sym
.name
) < 0)
316 rb_link_node(&symn
->rb_node
, parent
, p
);
317 rb_insert_color(&symn
->rb_node
, self
);
320 static void symbols__sort_by_name(struct rb_root
*self
, struct rb_root
*source
)
324 for (nd
= rb_first(source
); nd
; nd
= rb_next(nd
)) {
325 struct symbol
*pos
= rb_entry(nd
, struct symbol
, rb_node
);
326 symbols__insert_by_name(self
, pos
);
330 static struct symbol
*symbols__find_by_name(struct rb_root
*self
, const char *name
)
340 struct symbol_name_rb_node
*s
;
343 s
= rb_entry(n
, struct symbol_name_rb_node
, rb_node
);
344 cmp
= strcmp(name
, s
->sym
.name
);
357 struct symbol
*dso__find_symbol(struct dso
*self
,
358 enum map_type type
, u64 addr
)
360 return symbols__find(&self
->symbols
[type
], addr
);
363 struct symbol
*dso__find_symbol_by_name(struct dso
*self
, enum map_type type
,
366 return symbols__find_by_name(&self
->symbol_names
[type
], name
);
369 void dso__sort_by_name(struct dso
*self
, enum map_type type
)
371 dso__set_sorted_by_name(self
, type
);
372 return symbols__sort_by_name(&self
->symbol_names
[type
],
373 &self
->symbols
[type
]);
376 int build_id__sprintf(const u8
*self
, int len
, char *bf
)
379 const u8
*raw
= self
;
382 for (i
= 0; i
< len
; ++i
) {
383 sprintf(bid
, "%02x", *raw
);
391 size_t dso__fprintf_buildid(struct dso
*self
, FILE *fp
)
393 char sbuild_id
[BUILD_ID_SIZE
* 2 + 1];
395 build_id__sprintf(self
->build_id
, sizeof(self
->build_id
), sbuild_id
);
396 return fprintf(fp
, "%s", sbuild_id
);
399 size_t dso__fprintf_symbols_by_name(struct dso
*self
, enum map_type type
, FILE *fp
)
403 struct symbol_name_rb_node
*pos
;
405 for (nd
= rb_first(&self
->symbol_names
[type
]); nd
; nd
= rb_next(nd
)) {
406 pos
= rb_entry(nd
, struct symbol_name_rb_node
, rb_node
);
407 fprintf(fp
, "%s\n", pos
->sym
.name
);
413 size_t dso__fprintf(struct dso
*self
, enum map_type type
, FILE *fp
)
416 size_t ret
= fprintf(fp
, "dso: %s (", self
->short_name
);
418 if (self
->short_name
!= self
->long_name
)
419 ret
+= fprintf(fp
, "%s, ", self
->long_name
);
420 ret
+= fprintf(fp
, "%s, %sloaded, ", map_type__name
[type
],
421 self
->loaded
? "" : "NOT ");
422 ret
+= dso__fprintf_buildid(self
, fp
);
423 ret
+= fprintf(fp
, ")\n");
424 for (nd
= rb_first(&self
->symbols
[type
]); nd
; nd
= rb_next(nd
)) {
425 struct symbol
*pos
= rb_entry(nd
, struct symbol
, rb_node
);
426 ret
+= symbol__fprintf(pos
, fp
);
432 int kallsyms__parse(const char *filename
, void *arg
,
433 int (*process_symbol
)(void *arg
, const char *name
,
434 char type
, u64 start
, u64 end
))
440 char prev_symbol_type
= 0;
441 char *prev_symbol_name
;
442 FILE *file
= fopen(filename
, "r");
447 prev_symbol_name
= malloc(KSYM_NAME_LEN
);
448 if (prev_symbol_name
== NULL
)
453 while (!feof(file
)) {
459 line_len
= getline(&line
, &n
, file
);
460 if (line_len
< 0 || !line
)
463 line
[--line_len
] = '\0'; /* \n */
465 len
= hex2u64(line
, &start
);
468 if (len
+ 2 >= line_len
)
471 symbol_type
= toupper(line
[len
]);
473 symbol_name
= line
+ len
;
474 len
= line_len
- len
;
476 if (len
>= KSYM_NAME_LEN
) {
481 if (prev_symbol_type
) {
483 if (end
!= prev_start
)
485 err
= process_symbol(arg
, prev_symbol_name
,
486 prev_symbol_type
, prev_start
, end
);
491 memcpy(prev_symbol_name
, symbol_name
, len
+ 1);
492 prev_symbol_type
= symbol_type
;
496 free(prev_symbol_name
);
506 struct process_kallsyms_args
{
511 static u8
kallsyms2elf_type(char type
)
516 return isupper(type
) ? STB_GLOBAL
: STB_LOCAL
;
519 static int map__process_kallsym_symbol(void *arg
, const char *name
,
520 char type
, u64 start
, u64 end
)
523 struct process_kallsyms_args
*a
= arg
;
524 struct rb_root
*root
= &a
->dso
->symbols
[a
->map
->type
];
526 if (!symbol_type__is_a(type
, a
->map
->type
))
529 sym
= symbol__new(start
, end
- start
+ 1,
530 kallsyms2elf_type(type
), name
);
534 * We will pass the symbols to the filter later, in
535 * map__split_kallsyms, when we have split the maps per module
537 symbols__insert(root
, sym
);
543 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
544 * so that we can in the next step set the symbol ->end address and then
545 * call kernel_maps__split_kallsyms.
547 static int dso__load_all_kallsyms(struct dso
*self
, const char *filename
,
550 struct process_kallsyms_args args
= { .map
= map
, .dso
= self
, };
551 return kallsyms__parse(filename
, &args
, map__process_kallsym_symbol
);
555 * Split the symbols into maps, making sure there are no overlaps, i.e. the
556 * kernel range is broken in several maps, named [kernel].N, as we don't have
557 * the original ELF section names vmlinux have.
559 static int dso__split_kallsyms(struct dso
*self
, struct map
*map
,
560 symbol_filter_t filter
)
562 struct map_groups
*kmaps
= map__kmap(map
)->kmaps
;
563 struct machine
*machine
= kmaps
->machine
;
564 struct map
*curr_map
= map
;
566 int count
= 0, moved
= 0;
567 struct rb_root
*root
= &self
->symbols
[map
->type
];
568 struct rb_node
*next
= rb_first(root
);
569 int kernel_range
= 0;
574 pos
= rb_entry(next
, struct symbol
, rb_node
);
575 next
= rb_next(&pos
->rb_node
);
577 module
= strchr(pos
->name
, '\t');
579 if (!symbol_conf
.use_modules
)
584 if (strcmp(curr_map
->dso
->short_name
, module
)) {
585 if (curr_map
!= map
&&
586 self
->kernel
== DSO_TYPE_GUEST_KERNEL
&&
587 machine__is_default_guest(machine
)) {
589 * We assume all symbols of a module are
590 * continuous in * kallsyms, so curr_map
591 * points to a module and all its
592 * symbols are in its kmap. Mark it as
595 dso__set_loaded(curr_map
->dso
,
599 curr_map
= map_groups__find_by_name(kmaps
,
601 if (curr_map
== NULL
) {
602 pr_debug("%s/proc/{kallsyms,modules} "
603 "inconsistency while looking "
604 "for \"%s\" module!\n",
605 machine
->root_dir
, module
);
610 if (curr_map
->dso
->loaded
&&
611 !machine__is_default_guest(machine
))
615 * So that we look just like we get from .ko files,
616 * i.e. not prelinked, relative to map->start.
618 pos
->start
= curr_map
->map_ip(curr_map
, pos
->start
);
619 pos
->end
= curr_map
->map_ip(curr_map
, pos
->end
);
620 } else if (curr_map
!= map
) {
621 char dso_name
[PATH_MAX
];
629 if (self
->kernel
== DSO_TYPE_GUEST_KERNEL
)
630 snprintf(dso_name
, sizeof(dso_name
),
634 snprintf(dso_name
, sizeof(dso_name
),
638 dso
= dso__new(dso_name
);
642 dso
->kernel
= self
->kernel
;
644 curr_map
= map__new2(pos
->start
, dso
, map
->type
);
645 if (curr_map
== NULL
) {
650 curr_map
->map_ip
= curr_map
->unmap_ip
= identity__map_ip
;
651 map_groups__insert(kmaps
, curr_map
);
655 if (filter
&& filter(curr_map
, pos
)) {
656 discard_symbol
: rb_erase(&pos
->rb_node
, root
);
659 if (curr_map
!= map
) {
660 rb_erase(&pos
->rb_node
, root
);
661 symbols__insert(&curr_map
->dso
->symbols
[curr_map
->type
], pos
);
668 if (curr_map
!= map
&&
669 self
->kernel
== DSO_TYPE_GUEST_KERNEL
&&
670 machine__is_default_guest(kmaps
->machine
)) {
671 dso__set_loaded(curr_map
->dso
, curr_map
->type
);
674 return count
+ moved
;
677 int dso__load_kallsyms(struct dso
*self
, const char *filename
,
678 struct map
*map
, symbol_filter_t filter
)
680 if (dso__load_all_kallsyms(self
, filename
, map
) < 0)
683 if (self
->kernel
== DSO_TYPE_GUEST_KERNEL
)
684 self
->origin
= DSO__ORIG_GUEST_KERNEL
;
686 self
->origin
= DSO__ORIG_KERNEL
;
688 return dso__split_kallsyms(self
, map
, filter
);
691 static int dso__load_perf_map(struct dso
*self
, struct map
*map
,
692 symbol_filter_t filter
)
699 file
= fopen(self
->long_name
, "r");
703 while (!feof(file
)) {
708 line_len
= getline(&line
, &n
, file
);
715 line
[--line_len
] = '\0'; /* \n */
717 len
= hex2u64(line
, &start
);
720 if (len
+ 2 >= line_len
)
723 len
+= hex2u64(line
+ len
, &size
);
726 if (len
+ 2 >= line_len
)
729 sym
= symbol__new(start
, size
, STB_GLOBAL
, line
+ len
);
732 goto out_delete_line
;
734 if (filter
&& filter(map
, sym
))
737 symbols__insert(&self
->symbols
[map
->type
], sym
);
754 * elf_symtab__for_each_symbol - iterate thru all the symbols
756 * @self: struct elf_symtab instance to iterate
758 * @sym: GElf_Sym iterator
760 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
761 for (idx = 0, gelf_getsym(syms, idx, &sym);\
763 idx++, gelf_getsym(syms, idx, &sym))
765 static inline uint8_t elf_sym__type(const GElf_Sym
*sym
)
767 return GELF_ST_TYPE(sym
->st_info
);
770 static inline int elf_sym__is_function(const GElf_Sym
*sym
)
772 return elf_sym__type(sym
) == STT_FUNC
&&
774 sym
->st_shndx
!= SHN_UNDEF
;
777 static inline bool elf_sym__is_object(const GElf_Sym
*sym
)
779 return elf_sym__type(sym
) == STT_OBJECT
&&
781 sym
->st_shndx
!= SHN_UNDEF
;
784 static inline int elf_sym__is_label(const GElf_Sym
*sym
)
786 return elf_sym__type(sym
) == STT_NOTYPE
&&
788 sym
->st_shndx
!= SHN_UNDEF
&&
789 sym
->st_shndx
!= SHN_ABS
;
792 static inline const char *elf_sec__name(const GElf_Shdr
*shdr
,
793 const Elf_Data
*secstrs
)
795 return secstrs
->d_buf
+ shdr
->sh_name
;
798 static inline int elf_sec__is_text(const GElf_Shdr
*shdr
,
799 const Elf_Data
*secstrs
)
801 return strstr(elf_sec__name(shdr
, secstrs
), "text") != NULL
;
804 static inline bool elf_sec__is_data(const GElf_Shdr
*shdr
,
805 const Elf_Data
*secstrs
)
807 return strstr(elf_sec__name(shdr
, secstrs
), "data") != NULL
;
810 static inline const char *elf_sym__name(const GElf_Sym
*sym
,
811 const Elf_Data
*symstrs
)
813 return symstrs
->d_buf
+ sym
->st_name
;
816 static Elf_Scn
*elf_section_by_name(Elf
*elf
, GElf_Ehdr
*ep
,
817 GElf_Shdr
*shp
, const char *name
,
823 while ((sec
= elf_nextscn(elf
, sec
)) != NULL
) {
826 gelf_getshdr(sec
, shp
);
827 str
= elf_strptr(elf
, ep
->e_shstrndx
, shp
->sh_name
);
828 if (!strcmp(name
, str
)) {
839 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
840 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
842 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
844 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
845 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
847 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
850 * We need to check if we have a .dynsym, so that we can handle the
851 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
852 * .dynsym or .symtab).
853 * And always look at the original dso, not at debuginfo packages, that
854 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
856 static int dso__synthesize_plt_symbols(struct dso
*self
, struct map
*map
,
857 symbol_filter_t filter
)
859 uint32_t nr_rel_entries
, idx
;
864 GElf_Shdr shdr_rel_plt
, shdr_dynsym
;
865 Elf_Data
*reldata
, *syms
, *symstrs
;
866 Elf_Scn
*scn_plt_rel
, *scn_symstrs
, *scn_dynsym
;
869 char sympltname
[1024];
871 int nr
= 0, symidx
, fd
, err
= 0;
874 snprintf(name
, sizeof(name
), "%s%s",
875 symbol_conf
.symfs
, self
->long_name
);
876 fd
= open(name
, O_RDONLY
);
880 elf
= elf_begin(fd
, PERF_ELF_C_READ_MMAP
, NULL
);
884 if (gelf_getehdr(elf
, &ehdr
) == NULL
)
887 scn_dynsym
= elf_section_by_name(elf
, &ehdr
, &shdr_dynsym
,
888 ".dynsym", &dynsym_idx
);
889 if (scn_dynsym
== NULL
)
892 scn_plt_rel
= elf_section_by_name(elf
, &ehdr
, &shdr_rel_plt
,
894 if (scn_plt_rel
== NULL
) {
895 scn_plt_rel
= elf_section_by_name(elf
, &ehdr
, &shdr_rel_plt
,
897 if (scn_plt_rel
== NULL
)
903 if (shdr_rel_plt
.sh_link
!= dynsym_idx
)
906 if (elf_section_by_name(elf
, &ehdr
, &shdr_plt
, ".plt", NULL
) == NULL
)
910 * Fetch the relocation section to find the idxes to the GOT
911 * and the symbols in the .dynsym they refer to.
913 reldata
= elf_getdata(scn_plt_rel
, NULL
);
917 syms
= elf_getdata(scn_dynsym
, NULL
);
921 scn_symstrs
= elf_getscn(elf
, shdr_dynsym
.sh_link
);
922 if (scn_symstrs
== NULL
)
925 symstrs
= elf_getdata(scn_symstrs
, NULL
);
929 nr_rel_entries
= shdr_rel_plt
.sh_size
/ shdr_rel_plt
.sh_entsize
;
930 plt_offset
= shdr_plt
.sh_offset
;
932 if (shdr_rel_plt
.sh_type
== SHT_RELA
) {
933 GElf_Rela pos_mem
, *pos
;
935 elf_section__for_each_rela(reldata
, pos
, pos_mem
, idx
,
937 symidx
= GELF_R_SYM(pos
->r_info
);
938 plt_offset
+= shdr_plt
.sh_entsize
;
939 gelf_getsym(syms
, symidx
, &sym
);
940 snprintf(sympltname
, sizeof(sympltname
),
941 "%s@plt", elf_sym__name(&sym
, symstrs
));
943 f
= symbol__new(plt_offset
, shdr_plt
.sh_entsize
,
944 STB_GLOBAL
, sympltname
);
948 if (filter
&& filter(map
, f
))
951 symbols__insert(&self
->symbols
[map
->type
], f
);
955 } else if (shdr_rel_plt
.sh_type
== SHT_REL
) {
956 GElf_Rel pos_mem
, *pos
;
957 elf_section__for_each_rel(reldata
, pos
, pos_mem
, idx
,
959 symidx
= GELF_R_SYM(pos
->r_info
);
960 plt_offset
+= shdr_plt
.sh_entsize
;
961 gelf_getsym(syms
, symidx
, &sym
);
962 snprintf(sympltname
, sizeof(sympltname
),
963 "%s@plt", elf_sym__name(&sym
, symstrs
));
965 f
= symbol__new(plt_offset
, shdr_plt
.sh_entsize
,
966 STB_GLOBAL
, sympltname
);
970 if (filter
&& filter(map
, f
))
973 symbols__insert(&self
->symbols
[map
->type
], f
);
988 pr_debug("%s: problems reading %s PLT info.\n",
989 __func__
, self
->long_name
);
993 static bool elf_sym__is_a(GElf_Sym
*self
, enum map_type type
)
997 return elf_sym__is_function(self
);
999 return elf_sym__is_object(self
);
1005 static bool elf_sec__is_a(GElf_Shdr
*self
, Elf_Data
*secstrs
, enum map_type type
)
1009 return elf_sec__is_text(self
, secstrs
);
1011 return elf_sec__is_data(self
, secstrs
);
1017 static size_t elf_addr_to_index(Elf
*elf
, GElf_Addr addr
)
1019 Elf_Scn
*sec
= NULL
;
1023 while ((sec
= elf_nextscn(elf
, sec
)) != NULL
) {
1024 gelf_getshdr(sec
, &shdr
);
1026 if ((addr
>= shdr
.sh_addr
) &&
1027 (addr
< (shdr
.sh_addr
+ shdr
.sh_size
)))
1036 static int dso__load_sym(struct dso
*self
, struct map
*map
, const char *name
,
1037 int fd
, symbol_filter_t filter
, int kmodule
,
1040 struct kmap
*kmap
= self
->kernel
? map__kmap(map
) : NULL
;
1041 struct map
*curr_map
= map
;
1042 struct dso
*curr_dso
= self
;
1043 Elf_Data
*symstrs
, *secstrs
;
1048 GElf_Shdr shdr
, opdshdr
;
1049 Elf_Data
*syms
, *opddata
= NULL
;
1051 Elf_Scn
*sec
, *sec_strndx
, *opdsec
;
1056 elf
= elf_begin(fd
, PERF_ELF_C_READ_MMAP
, NULL
);
1058 pr_debug("%s: cannot read %s ELF file.\n", __func__
, name
);
1062 if (gelf_getehdr(elf
, &ehdr
) == NULL
) {
1063 pr_debug("%s: cannot get elf header.\n", __func__
);
1067 /* Always reject images with a mismatched build-id: */
1068 if (self
->has_build_id
) {
1069 u8 build_id
[BUILD_ID_SIZE
];
1071 if (elf_read_build_id(elf
, build_id
,
1072 BUILD_ID_SIZE
) != BUILD_ID_SIZE
)
1075 if (!dso__build_id_equal(self
, build_id
))
1079 sec
= elf_section_by_name(elf
, &ehdr
, &shdr
, ".symtab", NULL
);
1084 sec
= elf_section_by_name(elf
, &ehdr
, &shdr
, ".dynsym", NULL
);
1089 opdsec
= elf_section_by_name(elf
, &ehdr
, &opdshdr
, ".opd", &opdidx
);
1091 opddata
= elf_rawdata(opdsec
, NULL
);
1093 syms
= elf_getdata(sec
, NULL
);
1097 sec
= elf_getscn(elf
, shdr
.sh_link
);
1101 symstrs
= elf_getdata(sec
, NULL
);
1102 if (symstrs
== NULL
)
1105 sec_strndx
= elf_getscn(elf
, ehdr
.e_shstrndx
);
1106 if (sec_strndx
== NULL
)
1109 secstrs
= elf_getdata(sec_strndx
, NULL
);
1110 if (secstrs
== NULL
)
1113 nr_syms
= shdr
.sh_size
/ shdr
.sh_entsize
;
1115 memset(&sym
, 0, sizeof(sym
));
1116 if (self
->kernel
== DSO_TYPE_USER
) {
1117 self
->adjust_symbols
= (ehdr
.e_type
== ET_EXEC
||
1118 elf_section_by_name(elf
, &ehdr
, &shdr
,
1119 ".gnu.prelink_undo",
1121 } else self
->adjust_symbols
= 0;
1123 elf_symtab__for_each_symbol(syms
, nr_syms
, idx
, sym
) {
1125 const char *elf_name
= elf_sym__name(&sym
, symstrs
);
1126 char *demangled
= NULL
;
1127 int is_label
= elf_sym__is_label(&sym
);
1128 const char *section_name
;
1130 if (kmap
&& kmap
->ref_reloc_sym
&& kmap
->ref_reloc_sym
->name
&&
1131 strcmp(elf_name
, kmap
->ref_reloc_sym
->name
) == 0)
1132 kmap
->ref_reloc_sym
->unrelocated_addr
= sym
.st_value
;
1134 if (!is_label
&& !elf_sym__is_a(&sym
, map
->type
))
1137 /* Reject ARM ELF "mapping symbols": these aren't unique and
1138 * don't identify functions, so will confuse the profile
1140 if (ehdr
.e_machine
== EM_ARM
) {
1141 if (!strcmp(elf_name
, "$a") ||
1142 !strcmp(elf_name
, "$d") ||
1143 !strcmp(elf_name
, "$t"))
1147 if (opdsec
&& sym
.st_shndx
== opdidx
) {
1148 u32 offset
= sym
.st_value
- opdshdr
.sh_addr
;
1149 u64
*opd
= opddata
->d_buf
+ offset
;
1150 sym
.st_value
= *opd
;
1151 sym
.st_shndx
= elf_addr_to_index(elf
, sym
.st_value
);
1154 sec
= elf_getscn(elf
, sym
.st_shndx
);
1158 gelf_getshdr(sec
, &shdr
);
1160 if (is_label
&& !elf_sec__is_a(&shdr
, secstrs
, map
->type
))
1163 section_name
= elf_sec__name(&shdr
, secstrs
);
1165 /* On ARM, symbols for thumb functions have 1 added to
1166 * the symbol address as a flag - remove it */
1167 if ((ehdr
.e_machine
== EM_ARM
) &&
1168 (map
->type
== MAP__FUNCTION
) &&
1172 if (self
->kernel
!= DSO_TYPE_USER
|| kmodule
) {
1173 char dso_name
[PATH_MAX
];
1175 if (strcmp(section_name
,
1176 (curr_dso
->short_name
+
1177 self
->short_name_len
)) == 0)
1180 if (strcmp(section_name
, ".text") == 0) {
1186 snprintf(dso_name
, sizeof(dso_name
),
1187 "%s%s", self
->short_name
, section_name
);
1189 curr_map
= map_groups__find_by_name(kmap
->kmaps
, map
->type
, dso_name
);
1190 if (curr_map
== NULL
) {
1191 u64 start
= sym
.st_value
;
1194 start
+= map
->start
+ shdr
.sh_offset
;
1196 curr_dso
= dso__new(dso_name
);
1197 if (curr_dso
== NULL
)
1199 curr_dso
->kernel
= self
->kernel
;
1200 curr_map
= map__new2(start
, curr_dso
,
1202 if (curr_map
== NULL
) {
1203 dso__delete(curr_dso
);
1206 curr_map
->map_ip
= identity__map_ip
;
1207 curr_map
->unmap_ip
= identity__map_ip
;
1208 curr_dso
->origin
= self
->origin
;
1209 map_groups__insert(kmap
->kmaps
, curr_map
);
1210 dsos__add(&self
->node
, curr_dso
);
1211 dso__set_loaded(curr_dso
, map
->type
);
1213 curr_dso
= curr_map
->dso
;
1218 if (curr_dso
->adjust_symbols
) {
1219 pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64
" "
1220 "sh_addr: %#" PRIx64
" sh_offset: %#" PRIx64
"\n", __func__
,
1221 (u64
)sym
.st_value
, (u64
)shdr
.sh_addr
,
1222 (u64
)shdr
.sh_offset
);
1223 sym
.st_value
-= shdr
.sh_addr
- shdr
.sh_offset
;
1226 * We need to figure out if the object was created from C++ sources
1227 * DWARF DW_compile_unit has this, but we don't always have access
1230 demangled
= bfd_demangle(NULL
, elf_name
, DMGL_PARAMS
| DMGL_ANSI
);
1231 if (demangled
!= NULL
)
1232 elf_name
= demangled
;
1234 f
= symbol__new(sym
.st_value
, sym
.st_size
,
1235 GELF_ST_BIND(sym
.st_info
), elf_name
);
1240 if (filter
&& filter(curr_map
, f
))
1243 symbols__insert(&curr_dso
->symbols
[curr_map
->type
], f
);
1249 * For misannotated, zeroed, ASM function sizes.
1252 symbols__fixup_end(&self
->symbols
[map
->type
]);
1255 * We need to fixup this here too because we create new
1256 * maps here, for things like vsyscall sections.
1258 __map_groups__fixup_end(kmap
->kmaps
, map
->type
);
1268 static bool dso__build_id_equal(const struct dso
*self
, u8
*build_id
)
1270 return memcmp(self
->build_id
, build_id
, sizeof(self
->build_id
)) == 0;
1273 bool __dsos__read_build_ids(struct list_head
*head
, bool with_hits
)
1275 bool have_build_id
= false;
1278 list_for_each_entry(pos
, head
, node
) {
1279 if (with_hits
&& !pos
->hit
)
1281 if (pos
->has_build_id
) {
1282 have_build_id
= true;
1285 if (filename__read_build_id(pos
->long_name
, pos
->build_id
,
1286 sizeof(pos
->build_id
)) > 0) {
1287 have_build_id
= true;
1288 pos
->has_build_id
= true;
1292 return have_build_id
;
1296 * Align offset to 4 bytes as needed for note name and descriptor data.
1298 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
1300 static int elf_read_build_id(Elf
*elf
, void *bf
, size_t size
)
1310 if (size
< BUILD_ID_SIZE
)
1314 if (ek
!= ELF_K_ELF
)
1317 if (gelf_getehdr(elf
, &ehdr
) == NULL
) {
1318 pr_err("%s: cannot get elf header.\n", __func__
);
1322 sec
= elf_section_by_name(elf
, &ehdr
, &shdr
,
1323 ".note.gnu.build-id", NULL
);
1325 sec
= elf_section_by_name(elf
, &ehdr
, &shdr
,
1331 data
= elf_getdata(sec
, NULL
);
1336 while (ptr
< (data
->d_buf
+ data
->d_size
)) {
1337 GElf_Nhdr
*nhdr
= ptr
;
1338 int namesz
= NOTE_ALIGN(nhdr
->n_namesz
),
1339 descsz
= NOTE_ALIGN(nhdr
->n_descsz
);
1342 ptr
+= sizeof(*nhdr
);
1345 if (nhdr
->n_type
== NT_GNU_BUILD_ID
&&
1346 nhdr
->n_namesz
== sizeof("GNU")) {
1347 if (memcmp(name
, "GNU", sizeof("GNU")) == 0) {
1348 memcpy(bf
, ptr
, BUILD_ID_SIZE
);
1349 err
= BUILD_ID_SIZE
;
1360 int filename__read_build_id(const char *filename
, void *bf
, size_t size
)
1365 if (size
< BUILD_ID_SIZE
)
1368 fd
= open(filename
, O_RDONLY
);
1372 elf
= elf_begin(fd
, PERF_ELF_C_READ_MMAP
, NULL
);
1374 pr_debug2("%s: cannot read %s ELF file.\n", __func__
, filename
);
1378 err
= elf_read_build_id(elf
, bf
, size
);
1387 int sysfs__read_build_id(const char *filename
, void *build_id
, size_t size
)
1391 if (size
< BUILD_ID_SIZE
)
1394 fd
= open(filename
, O_RDONLY
);
1403 if (read(fd
, &nhdr
, sizeof(nhdr
)) != sizeof(nhdr
))
1406 namesz
= NOTE_ALIGN(nhdr
.n_namesz
);
1407 descsz
= NOTE_ALIGN(nhdr
.n_descsz
);
1408 if (nhdr
.n_type
== NT_GNU_BUILD_ID
&&
1409 nhdr
.n_namesz
== sizeof("GNU")) {
1410 if (read(fd
, bf
, namesz
) != namesz
)
1412 if (memcmp(bf
, "GNU", sizeof("GNU")) == 0) {
1413 if (read(fd
, build_id
,
1414 BUILD_ID_SIZE
) == BUILD_ID_SIZE
) {
1418 } else if (read(fd
, bf
, descsz
) != descsz
)
1421 int n
= namesz
+ descsz
;
1422 if (read(fd
, bf
, n
) != n
)
1431 char dso__symtab_origin(const struct dso
*self
)
1433 static const char origin
[] = {
1434 [DSO__ORIG_KERNEL
] = 'k',
1435 [DSO__ORIG_JAVA_JIT
] = 'j',
1436 [DSO__ORIG_BUILD_ID_CACHE
] = 'B',
1437 [DSO__ORIG_FEDORA
] = 'f',
1438 [DSO__ORIG_UBUNTU
] = 'u',
1439 [DSO__ORIG_BUILDID
] = 'b',
1440 [DSO__ORIG_DSO
] = 'd',
1441 [DSO__ORIG_KMODULE
] = 'K',
1442 [DSO__ORIG_GUEST_KERNEL
] = 'g',
1443 [DSO__ORIG_GUEST_KMODULE
] = 'G',
1446 if (self
== NULL
|| self
->origin
== DSO__ORIG_NOT_FOUND
)
1448 return origin
[self
->origin
];
1451 int dso__load(struct dso
*self
, struct map
*map
, symbol_filter_t filter
)
1453 int size
= PATH_MAX
;
1457 struct machine
*machine
;
1458 const char *root_dir
;
1461 dso__set_loaded(self
, map
->type
);
1463 if (self
->kernel
== DSO_TYPE_KERNEL
)
1464 return dso__load_kernel_sym(self
, map
, filter
);
1465 else if (self
->kernel
== DSO_TYPE_GUEST_KERNEL
)
1466 return dso__load_guest_kernel_sym(self
, map
, filter
);
1468 if (map
->groups
&& map
->groups
->machine
)
1469 machine
= map
->groups
->machine
;
1473 name
= malloc(size
);
1477 self
->adjust_symbols
= 0;
1479 if (strncmp(self
->name
, "/tmp/perf-", 10) == 0) {
1480 ret
= dso__load_perf_map(self
, map
, filter
);
1481 self
->origin
= ret
> 0 ? DSO__ORIG_JAVA_JIT
:
1482 DSO__ORIG_NOT_FOUND
;
1486 /* Iterate over candidate debug images.
1487 * On the first pass, only load images if they have a full symtab.
1488 * Failing that, do a second pass where we accept .dynsym also
1490 for (self
->origin
= DSO__ORIG_BUILD_ID_CACHE
, want_symtab
= 1;
1491 self
->origin
!= DSO__ORIG_NOT_FOUND
;
1493 switch (self
->origin
) {
1494 case DSO__ORIG_BUILD_ID_CACHE
:
1495 /* skip the locally configured cache if a symfs is given */
1496 if (symbol_conf
.symfs
[0] ||
1497 (dso__build_id_filename(self
, name
, size
) == NULL
)) {
1501 case DSO__ORIG_FEDORA
:
1502 snprintf(name
, size
, "%s/usr/lib/debug%s.debug",
1503 symbol_conf
.symfs
, self
->long_name
);
1505 case DSO__ORIG_UBUNTU
:
1506 snprintf(name
, size
, "%s/usr/lib/debug%s",
1507 symbol_conf
.symfs
, self
->long_name
);
1509 case DSO__ORIG_BUILDID
: {
1510 char build_id_hex
[BUILD_ID_SIZE
* 2 + 1];
1512 if (!self
->has_build_id
)
1515 build_id__sprintf(self
->build_id
,
1516 sizeof(self
->build_id
),
1518 snprintf(name
, size
,
1519 "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
1520 symbol_conf
.symfs
, build_id_hex
, build_id_hex
+ 2);
1524 snprintf(name
, size
, "%s%s",
1525 symbol_conf
.symfs
, self
->long_name
);
1527 case DSO__ORIG_GUEST_KMODULE
:
1528 if (map
->groups
&& machine
)
1529 root_dir
= machine
->root_dir
;
1532 snprintf(name
, size
, "%s%s%s", symbol_conf
.symfs
,
1533 root_dir
, self
->long_name
);
1536 case DSO__ORIG_KMODULE
:
1537 snprintf(name
, size
, "%s%s", symbol_conf
.symfs
,
1543 * If we wanted a full symtab but no image had one,
1544 * relax our requirements and repeat the search.
1548 self
->origin
= DSO__ORIG_BUILD_ID_CACHE
;
1553 /* Name is now the name of the next image to try */
1554 fd
= open(name
, O_RDONLY
);
1558 ret
= dso__load_sym(self
, map
, name
, fd
, filter
, 0,
1563 * Some people seem to have debuginfo files _WITHOUT_ debug
1570 int nr_plt
= dso__synthesize_plt_symbols(self
, map
, filter
);
1578 if (ret
< 0 && strstr(self
->name
, " (deleted)") != NULL
)
1583 struct map
*map_groups__find_by_name(struct map_groups
*self
,
1584 enum map_type type
, const char *name
)
1588 for (nd
= rb_first(&self
->maps
[type
]); nd
; nd
= rb_next(nd
)) {
1589 struct map
*map
= rb_entry(nd
, struct map
, rb_node
);
1591 if (map
->dso
&& strcmp(map
->dso
->short_name
, name
) == 0)
1598 static int dso__kernel_module_get_build_id(struct dso
*self
,
1599 const char *root_dir
)
1601 char filename
[PATH_MAX
];
1603 * kernel module short names are of the form "[module]" and
1604 * we need just "module" here.
1606 const char *name
= self
->short_name
+ 1;
1608 snprintf(filename
, sizeof(filename
),
1609 "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1610 root_dir
, (int)strlen(name
) - 1, name
);
1612 if (sysfs__read_build_id(filename
, self
->build_id
,
1613 sizeof(self
->build_id
)) == 0)
1614 self
->has_build_id
= true;
1619 static int map_groups__set_modules_path_dir(struct map_groups
*self
,
1620 const char *dir_name
)
1622 struct dirent
*dent
;
1623 DIR *dir
= opendir(dir_name
);
1627 pr_debug("%s: cannot open %s dir\n", __func__
, dir_name
);
1631 while ((dent
= readdir(dir
)) != NULL
) {
1632 char path
[PATH_MAX
];
1635 /*sshfs might return bad dent->d_type, so we have to stat*/
1636 sprintf(path
, "%s/%s", dir_name
, dent
->d_name
);
1637 if (stat(path
, &st
))
1640 if (S_ISDIR(st
.st_mode
)) {
1641 if (!strcmp(dent
->d_name
, ".") ||
1642 !strcmp(dent
->d_name
, ".."))
1645 snprintf(path
, sizeof(path
), "%s/%s",
1646 dir_name
, dent
->d_name
);
1647 ret
= map_groups__set_modules_path_dir(self
, path
);
1651 char *dot
= strrchr(dent
->d_name
, '.'),
1656 if (dot
== NULL
|| strcmp(dot
, ".ko"))
1658 snprintf(dso_name
, sizeof(dso_name
), "[%.*s]",
1659 (int)(dot
- dent
->d_name
), dent
->d_name
);
1661 strxfrchar(dso_name
, '-', '_');
1662 map
= map_groups__find_by_name(self
, MAP__FUNCTION
, dso_name
);
1666 snprintf(path
, sizeof(path
), "%s/%s",
1667 dir_name
, dent
->d_name
);
1669 long_name
= strdup(path
);
1670 if (long_name
== NULL
) {
1674 dso__set_long_name(map
->dso
, long_name
);
1675 map
->dso
->lname_alloc
= 1;
1676 dso__kernel_module_get_build_id(map
->dso
, "");
1685 static char *get_kernel_version(const char *root_dir
)
1687 char version
[PATH_MAX
];
1690 const char *prefix
= "Linux version ";
1692 sprintf(version
, "%s/proc/version", root_dir
);
1693 file
= fopen(version
, "r");
1698 tmp
= fgets(version
, sizeof(version
), file
);
1701 name
= strstr(version
, prefix
);
1704 name
+= strlen(prefix
);
1705 tmp
= strchr(name
, ' ');
1709 return strdup(name
);
1712 static int machine__set_modules_path(struct machine
*self
)
1715 char modules_path
[PATH_MAX
];
1717 version
= get_kernel_version(self
->root_dir
);
1721 snprintf(modules_path
, sizeof(modules_path
), "%s/lib/modules/%s/kernel",
1722 self
->root_dir
, version
);
1725 return map_groups__set_modules_path_dir(&self
->kmaps
, modules_path
);
1729 * Constructor variant for modules (where we know from /proc/modules where
1730 * they are loaded) and for vmlinux, where only after we load all the
1731 * symbols we'll know where it starts and ends.
1733 static struct map
*map__new2(u64 start
, struct dso
*dso
, enum map_type type
)
1735 struct map
*self
= calloc(1, (sizeof(*self
) +
1736 (dso
->kernel
? sizeof(struct kmap
) : 0)));
1739 * ->end will be filled after we load all the symbols
1741 map__init(self
, type
, start
, 0, 0, dso
);
1747 struct map
*machine__new_module(struct machine
*self
, u64 start
,
1748 const char *filename
)
1751 struct dso
*dso
= __dsos__findnew(&self
->kernel_dsos
, filename
);
1756 map
= map__new2(start
, dso
, MAP__FUNCTION
);
1760 if (machine__is_host(self
))
1761 dso
->origin
= DSO__ORIG_KMODULE
;
1763 dso
->origin
= DSO__ORIG_GUEST_KMODULE
;
1764 map_groups__insert(&self
->kmaps
, map
);
1768 static int machine__create_modules(struct machine
*self
)
1774 const char *modules
;
1775 char path
[PATH_MAX
];
1777 if (machine__is_default_guest(self
))
1778 modules
= symbol_conf
.default_guest_modules
;
1780 sprintf(path
, "%s/proc/modules", self
->root_dir
);
1784 file
= fopen(modules
, "r");
1788 while (!feof(file
)) {
1789 char name
[PATH_MAX
];
1794 line_len
= getline(&line
, &n
, file
);
1801 line
[--line_len
] = '\0'; /* \n */
1803 sep
= strrchr(line
, 'x');
1807 hex2u64(sep
+ 1, &start
);
1809 sep
= strchr(line
, ' ');
1815 snprintf(name
, sizeof(name
), "[%s]", line
);
1816 map
= machine__new_module(self
, start
, name
);
1818 goto out_delete_line
;
1819 dso__kernel_module_get_build_id(map
->dso
, self
->root_dir
);
1825 return machine__set_modules_path(self
);
1833 int dso__load_vmlinux(struct dso
*self
, struct map
*map
,
1834 const char *vmlinux
, symbol_filter_t filter
)
1837 char symfs_vmlinux
[PATH_MAX
];
1839 snprintf(symfs_vmlinux
, sizeof(symfs_vmlinux
), "%s%s",
1840 symbol_conf
.symfs
, vmlinux
);
1841 fd
= open(symfs_vmlinux
, O_RDONLY
);
1845 dso__set_loaded(self
, map
->type
);
1846 err
= dso__load_sym(self
, map
, symfs_vmlinux
, fd
, filter
, 0, 0);
1850 pr_debug("Using %s for symbols\n", symfs_vmlinux
);
1855 int dso__load_vmlinux_path(struct dso
*self
, struct map
*map
,
1856 symbol_filter_t filter
)
1861 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1862 vmlinux_path__nr_entries
+ 1);
1864 filename
= dso__build_id_filename(self
, NULL
, 0);
1865 if (filename
!= NULL
) {
1866 err
= dso__load_vmlinux(self
, map
, filename
, filter
);
1868 dso__set_long_name(self
, filename
);
1874 for (i
= 0; i
< vmlinux_path__nr_entries
; ++i
) {
1875 err
= dso__load_vmlinux(self
, map
, vmlinux_path
[i
], filter
);
1877 dso__set_long_name(self
, strdup(vmlinux_path
[i
]));
1885 static int dso__load_kernel_sym(struct dso
*self
, struct map
*map
,
1886 symbol_filter_t filter
)
1889 const char *kallsyms_filename
= NULL
;
1890 char *kallsyms_allocated_filename
= NULL
;
1892 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1893 * it and only it, reporting errors to the user if it cannot be used.
1895 * For instance, try to analyse an ARM perf.data file _without_ a
1896 * build-id, or if the user specifies the wrong path to the right
1897 * vmlinux file, obviously we can't fallback to another vmlinux (a
1898 * x86_86 one, on the machine where analysis is being performed, say),
1899 * or worse, /proc/kallsyms.
1901 * If the specified file _has_ a build-id and there is a build-id
1902 * section in the perf.data file, we will still do the expected
1903 * validation in dso__load_vmlinux and will bail out if they don't
1906 if (symbol_conf
.kallsyms_name
!= NULL
) {
1907 kallsyms_filename
= symbol_conf
.kallsyms_name
;
1911 if (symbol_conf
.vmlinux_name
!= NULL
) {
1912 err
= dso__load_vmlinux(self
, map
,
1913 symbol_conf
.vmlinux_name
, filter
);
1915 dso__set_long_name(self
,
1916 strdup(symbol_conf
.vmlinux_name
));
1922 if (vmlinux_path
!= NULL
) {
1923 err
= dso__load_vmlinux_path(self
, map
, filter
);
1928 /* do not try local files if a symfs was given */
1929 if (symbol_conf
.symfs
[0] != 0)
1933 * Say the kernel DSO was created when processing the build-id header table,
1934 * we have a build-id, so check if it is the same as the running kernel,
1935 * using it if it is.
1937 if (self
->has_build_id
) {
1938 u8 kallsyms_build_id
[BUILD_ID_SIZE
];
1939 char sbuild_id
[BUILD_ID_SIZE
* 2 + 1];
1941 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id
,
1942 sizeof(kallsyms_build_id
)) == 0) {
1943 if (dso__build_id_equal(self
, kallsyms_build_id
)) {
1944 kallsyms_filename
= "/proc/kallsyms";
1949 * Now look if we have it on the build-id cache in
1950 * $HOME/.debug/[kernel.kallsyms].
1952 build_id__sprintf(self
->build_id
, sizeof(self
->build_id
),
1955 if (asprintf(&kallsyms_allocated_filename
,
1956 "%s/.debug/[kernel.kallsyms]/%s",
1957 getenv("HOME"), sbuild_id
) == -1) {
1958 pr_err("Not enough memory for kallsyms file lookup\n");
1962 kallsyms_filename
= kallsyms_allocated_filename
;
1964 if (access(kallsyms_filename
, F_OK
)) {
1965 pr_err("No kallsyms or vmlinux with build-id %s "
1966 "was found\n", sbuild_id
);
1967 free(kallsyms_allocated_filename
);
1972 * Last resort, if we don't have a build-id and couldn't find
1973 * any vmlinux file, try the running kernel kallsyms table.
1975 kallsyms_filename
= "/proc/kallsyms";
1979 err
= dso__load_kallsyms(self
, kallsyms_filename
, map
, filter
);
1981 pr_debug("Using %s for symbols\n", kallsyms_filename
);
1982 free(kallsyms_allocated_filename
);
1986 if (kallsyms_filename
!= NULL
)
1987 dso__set_long_name(self
, strdup("[kernel.kallsyms]"));
1988 map__fixup_start(map
);
1989 map__fixup_end(map
);
1995 static int dso__load_guest_kernel_sym(struct dso
*self
, struct map
*map
,
1996 symbol_filter_t filter
)
1999 const char *kallsyms_filename
= NULL
;
2000 struct machine
*machine
;
2001 char path
[PATH_MAX
];
2004 pr_debug("Guest kernel map hasn't the point to groups\n");
2007 machine
= map
->groups
->machine
;
2009 if (machine__is_default_guest(machine
)) {
2011 * if the user specified a vmlinux filename, use it and only
2012 * it, reporting errors to the user if it cannot be used.
2013 * Or use file guest_kallsyms inputted by user on commandline
2015 if (symbol_conf
.default_guest_vmlinux_name
!= NULL
) {
2016 err
= dso__load_vmlinux(self
, map
,
2017 symbol_conf
.default_guest_vmlinux_name
, filter
);
2021 kallsyms_filename
= symbol_conf
.default_guest_kallsyms
;
2022 if (!kallsyms_filename
)
2025 sprintf(path
, "%s/proc/kallsyms", machine
->root_dir
);
2026 kallsyms_filename
= path
;
2029 err
= dso__load_kallsyms(self
, kallsyms_filename
, map
, filter
);
2031 pr_debug("Using %s for symbols\n", kallsyms_filename
);
2035 if (kallsyms_filename
!= NULL
) {
2036 machine__mmap_name(machine
, path
, sizeof(path
));
2037 dso__set_long_name(self
, strdup(path
));
2039 map__fixup_start(map
);
2040 map__fixup_end(map
);
2046 static void dsos__add(struct list_head
*head
, struct dso
*dso
)
2048 list_add_tail(&dso
->node
, head
);
2051 static struct dso
*dsos__find(struct list_head
*head
, const char *name
)
2055 list_for_each_entry(pos
, head
, node
)
2056 if (strcmp(pos
->long_name
, name
) == 0)
2061 struct dso
*__dsos__findnew(struct list_head
*head
, const char *name
)
2063 struct dso
*dso
= dsos__find(head
, name
);
2066 dso
= dso__new(name
);
2068 dsos__add(head
, dso
);
2069 dso__set_basename(dso
);
2076 size_t __dsos__fprintf(struct list_head
*head
, FILE *fp
)
2081 list_for_each_entry(pos
, head
, node
) {
2083 for (i
= 0; i
< MAP__NR_TYPES
; ++i
)
2084 ret
+= dso__fprintf(pos
, i
, fp
);
2090 size_t machines__fprintf_dsos(struct rb_root
*self
, FILE *fp
)
2095 for (nd
= rb_first(self
); nd
; nd
= rb_next(nd
)) {
2096 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
2097 ret
+= __dsos__fprintf(&pos
->kernel_dsos
, fp
);
2098 ret
+= __dsos__fprintf(&pos
->user_dsos
, fp
);
2104 static size_t __dsos__fprintf_buildid(struct list_head
*head
, FILE *fp
,
2110 list_for_each_entry(pos
, head
, node
) {
2111 if (with_hits
&& !pos
->hit
)
2113 ret
+= dso__fprintf_buildid(pos
, fp
);
2114 ret
+= fprintf(fp
, " %s\n", pos
->long_name
);
2119 size_t machine__fprintf_dsos_buildid(struct machine
*self
, FILE *fp
, bool with_hits
)
2121 return __dsos__fprintf_buildid(&self
->kernel_dsos
, fp
, with_hits
) +
2122 __dsos__fprintf_buildid(&self
->user_dsos
, fp
, with_hits
);
2125 size_t machines__fprintf_dsos_buildid(struct rb_root
*self
, FILE *fp
, bool with_hits
)
2130 for (nd
= rb_first(self
); nd
; nd
= rb_next(nd
)) {
2131 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
2132 ret
+= machine__fprintf_dsos_buildid(pos
, fp
, with_hits
);
2137 struct dso
*dso__new_kernel(const char *name
)
2139 struct dso
*self
= dso__new(name
?: "[kernel.kallsyms]");
2142 dso__set_short_name(self
, "[kernel]");
2143 self
->kernel
= DSO_TYPE_KERNEL
;
2149 static struct dso
*dso__new_guest_kernel(struct machine
*machine
,
2153 struct dso
*self
= dso__new(name
?: machine__mmap_name(machine
, bf
, sizeof(bf
)));
2156 dso__set_short_name(self
, "[guest.kernel]");
2157 self
->kernel
= DSO_TYPE_GUEST_KERNEL
;
2163 void dso__read_running_kernel_build_id(struct dso
*self
, struct machine
*machine
)
2165 char path
[PATH_MAX
];
2167 if (machine__is_default_guest(machine
))
2169 sprintf(path
, "%s/sys/kernel/notes", machine
->root_dir
);
2170 if (sysfs__read_build_id(path
, self
->build_id
,
2171 sizeof(self
->build_id
)) == 0)
2172 self
->has_build_id
= true;
2175 static struct dso
*machine__create_kernel(struct machine
*self
)
2177 const char *vmlinux_name
= NULL
;
2180 if (machine__is_host(self
)) {
2181 vmlinux_name
= symbol_conf
.vmlinux_name
;
2182 kernel
= dso__new_kernel(vmlinux_name
);
2184 if (machine__is_default_guest(self
))
2185 vmlinux_name
= symbol_conf
.default_guest_vmlinux_name
;
2186 kernel
= dso__new_guest_kernel(self
, vmlinux_name
);
2189 if (kernel
!= NULL
) {
2190 dso__read_running_kernel_build_id(kernel
, self
);
2191 dsos__add(&self
->kernel_dsos
, kernel
);
2196 struct process_args
{
2200 static int symbol__in_kernel(void *arg
, const char *name
,
2201 char type __used
, u64 start
, u64 end __used
)
2203 struct process_args
*args
= arg
;
2205 if (strchr(name
, '['))
2208 args
->start
= start
;
2212 /* Figure out the start address of kernel map from /proc/kallsyms */
2213 static u64
machine__get_kernel_start_addr(struct machine
*machine
)
2215 const char *filename
;
2216 char path
[PATH_MAX
];
2217 struct process_args args
;
2219 if (machine__is_host(machine
)) {
2220 filename
= "/proc/kallsyms";
2222 if (machine__is_default_guest(machine
))
2223 filename
= (char *)symbol_conf
.default_guest_kallsyms
;
2225 sprintf(path
, "%s/proc/kallsyms", machine
->root_dir
);
2230 if (kallsyms__parse(filename
, &args
, symbol__in_kernel
) <= 0)
2236 int __machine__create_kernel_maps(struct machine
*self
, struct dso
*kernel
)
2239 u64 start
= machine__get_kernel_start_addr(self
);
2241 for (type
= 0; type
< MAP__NR_TYPES
; ++type
) {
2244 self
->vmlinux_maps
[type
] = map__new2(start
, kernel
, type
);
2245 if (self
->vmlinux_maps
[type
] == NULL
)
2248 self
->vmlinux_maps
[type
]->map_ip
=
2249 self
->vmlinux_maps
[type
]->unmap_ip
= identity__map_ip
;
2251 kmap
= map__kmap(self
->vmlinux_maps
[type
]);
2252 kmap
->kmaps
= &self
->kmaps
;
2253 map_groups__insert(&self
->kmaps
, self
->vmlinux_maps
[type
]);
2259 void machine__destroy_kernel_maps(struct machine
*self
)
2263 for (type
= 0; type
< MAP__NR_TYPES
; ++type
) {
2266 if (self
->vmlinux_maps
[type
] == NULL
)
2269 kmap
= map__kmap(self
->vmlinux_maps
[type
]);
2270 map_groups__remove(&self
->kmaps
, self
->vmlinux_maps
[type
]);
2271 if (kmap
->ref_reloc_sym
) {
2273 * ref_reloc_sym is shared among all maps, so free just
2276 if (type
== MAP__FUNCTION
) {
2277 free((char *)kmap
->ref_reloc_sym
->name
);
2278 kmap
->ref_reloc_sym
->name
= NULL
;
2279 free(kmap
->ref_reloc_sym
);
2281 kmap
->ref_reloc_sym
= NULL
;
2284 map__delete(self
->vmlinux_maps
[type
]);
2285 self
->vmlinux_maps
[type
] = NULL
;
2289 int machine__create_kernel_maps(struct machine
*self
)
2291 struct dso
*kernel
= machine__create_kernel(self
);
2293 if (kernel
== NULL
||
2294 __machine__create_kernel_maps(self
, kernel
) < 0)
2297 if (symbol_conf
.use_modules
&& machine__create_modules(self
) < 0)
2298 pr_debug("Problems creating module maps, continuing anyway...\n");
2300 * Now that we have all the maps created, just set the ->end of them:
2302 map_groups__fixup_end(&self
->kmaps
);
2306 static void vmlinux_path__exit(void)
2308 while (--vmlinux_path__nr_entries
>= 0) {
2309 free(vmlinux_path
[vmlinux_path__nr_entries
]);
2310 vmlinux_path
[vmlinux_path__nr_entries
] = NULL
;
2314 vmlinux_path
= NULL
;
2317 static int vmlinux_path__init(void)
2322 vmlinux_path
= malloc(sizeof(char *) * 5);
2323 if (vmlinux_path
== NULL
)
2326 vmlinux_path
[vmlinux_path__nr_entries
] = strdup("vmlinux");
2327 if (vmlinux_path
[vmlinux_path__nr_entries
] == NULL
)
2329 ++vmlinux_path__nr_entries
;
2330 vmlinux_path
[vmlinux_path__nr_entries
] = strdup("/boot/vmlinux");
2331 if (vmlinux_path
[vmlinux_path__nr_entries
] == NULL
)
2333 ++vmlinux_path__nr_entries
;
2335 /* only try running kernel version if no symfs was given */
2336 if (symbol_conf
.symfs
[0] != 0)
2339 if (uname(&uts
) < 0)
2342 snprintf(bf
, sizeof(bf
), "/boot/vmlinux-%s", uts
.release
);
2343 vmlinux_path
[vmlinux_path__nr_entries
] = strdup(bf
);
2344 if (vmlinux_path
[vmlinux_path__nr_entries
] == NULL
)
2346 ++vmlinux_path__nr_entries
;
2347 snprintf(bf
, sizeof(bf
), "/lib/modules/%s/build/vmlinux", uts
.release
);
2348 vmlinux_path
[vmlinux_path__nr_entries
] = strdup(bf
);
2349 if (vmlinux_path
[vmlinux_path__nr_entries
] == NULL
)
2351 ++vmlinux_path__nr_entries
;
2352 snprintf(bf
, sizeof(bf
), "/usr/lib/debug/lib/modules/%s/vmlinux",
2354 vmlinux_path
[vmlinux_path__nr_entries
] = strdup(bf
);
2355 if (vmlinux_path
[vmlinux_path__nr_entries
] == NULL
)
2357 ++vmlinux_path__nr_entries
;
2362 vmlinux_path__exit();
2366 size_t machine__fprintf_vmlinux_path(struct machine
*self
, FILE *fp
)
2370 struct dso
*kdso
= self
->vmlinux_maps
[MAP__FUNCTION
]->dso
;
2372 if (kdso
->has_build_id
) {
2373 char filename
[PATH_MAX
];
2374 if (dso__build_id_filename(kdso
, filename
, sizeof(filename
)))
2375 printed
+= fprintf(fp
, "[0] %s\n", filename
);
2378 for (i
= 0; i
< vmlinux_path__nr_entries
; ++i
)
2379 printed
+= fprintf(fp
, "[%d] %s\n",
2380 i
+ kdso
->has_build_id
, vmlinux_path
[i
]);
2385 static int setup_list(struct strlist
**list
, const char *list_str
,
2386 const char *list_name
)
2388 if (list_str
== NULL
)
2391 *list
= strlist__new(true, list_str
);
2393 pr_err("problems parsing %s list\n", list_name
);
2399 int symbol__init(void)
2403 if (symbol_conf
.initialized
)
2406 elf_version(EV_CURRENT
);
2407 if (symbol_conf
.sort_by_name
)
2408 symbol_conf
.priv_size
+= (sizeof(struct symbol_name_rb_node
) -
2409 sizeof(struct symbol
));
2411 if (symbol_conf
.try_vmlinux_path
&& vmlinux_path__init() < 0)
2414 if (symbol_conf
.field_sep
&& *symbol_conf
.field_sep
== '.') {
2415 pr_err("'.' is the only non valid --field-separator argument\n");
2419 if (setup_list(&symbol_conf
.dso_list
,
2420 symbol_conf
.dso_list_str
, "dso") < 0)
2423 if (setup_list(&symbol_conf
.comm_list
,
2424 symbol_conf
.comm_list_str
, "comm") < 0)
2425 goto out_free_dso_list
;
2427 if (setup_list(&symbol_conf
.sym_list
,
2428 symbol_conf
.sym_list_str
, "symbol") < 0)
2429 goto out_free_comm_list
;
2432 * A path to symbols of "/" is identical to ""
2433 * reset here for simplicity.
2435 symfs
= realpath(symbol_conf
.symfs
, NULL
);
2437 symfs
= symbol_conf
.symfs
;
2438 if (strcmp(symfs
, "/") == 0)
2439 symbol_conf
.symfs
= "";
2440 if (symfs
!= symbol_conf
.symfs
)
2441 free((void *)symfs
);
2443 symbol_conf
.initialized
= true;
2447 strlist__delete(symbol_conf
.dso_list
);
2449 strlist__delete(symbol_conf
.comm_list
);
2453 void symbol__exit(void)
2455 if (!symbol_conf
.initialized
)
2457 strlist__delete(symbol_conf
.sym_list
);
2458 strlist__delete(symbol_conf
.dso_list
);
2459 strlist__delete(symbol_conf
.comm_list
);
2460 vmlinux_path__exit();
2461 symbol_conf
.sym_list
= symbol_conf
.dso_list
= symbol_conf
.comm_list
= NULL
;
2462 symbol_conf
.initialized
= false;
2465 int machines__create_kernel_maps(struct rb_root
*self
, pid_t pid
)
2467 struct machine
*machine
= machines__findnew(self
, pid
);
2469 if (machine
== NULL
)
2472 return machine__create_kernel_maps(machine
);
2475 static int hex(char ch
)
2477 if ((ch
>= '0') && (ch
<= '9'))
2479 if ((ch
>= 'a') && (ch
<= 'f'))
2480 return ch
- 'a' + 10;
2481 if ((ch
>= 'A') && (ch
<= 'F'))
2482 return ch
- 'A' + 10;
2487 * While we find nice hex chars, build a long_val.
2488 * Return number of chars processed.
2490 int hex2u64(const char *ptr
, u64
*long_val
)
2492 const char *p
= ptr
;
2496 const int hex_val
= hex(*p
);
2501 *long_val
= (*long_val
<< 4) | hex_val
;
2508 char *strxfrchar(char *s
, char from
, char to
)
2512 while ((p
= strchr(p
, from
)) != NULL
)
2518 int machines__create_guest_kernel_maps(struct rb_root
*self
)
2521 struct dirent
**namelist
= NULL
;
2523 char path
[PATH_MAX
];
2526 if (symbol_conf
.default_guest_vmlinux_name
||
2527 symbol_conf
.default_guest_modules
||
2528 symbol_conf
.default_guest_kallsyms
) {
2529 machines__create_kernel_maps(self
, DEFAULT_GUEST_KERNEL_ID
);
2532 if (symbol_conf
.guestmount
) {
2533 items
= scandir(symbol_conf
.guestmount
, &namelist
, NULL
, NULL
);
2536 for (i
= 0; i
< items
; i
++) {
2537 if (!isdigit(namelist
[i
]->d_name
[0])) {
2538 /* Filter out . and .. */
2541 pid
= atoi(namelist
[i
]->d_name
);
2542 sprintf(path
, "%s/%s/proc/kallsyms",
2543 symbol_conf
.guestmount
,
2544 namelist
[i
]->d_name
);
2545 ret
= access(path
, R_OK
);
2547 pr_debug("Can't access file %s\n", path
);
2550 machines__create_kernel_maps(self
, pid
);
2559 void machines__destroy_guest_kernel_maps(struct rb_root
*self
)
2561 struct rb_node
*next
= rb_first(self
);
2564 struct machine
*pos
= rb_entry(next
, struct machine
, rb_node
);
2566 next
= rb_next(&pos
->rb_node
);
2567 rb_erase(&pos
->rb_node
, self
);
2568 machine__delete(pos
);
2572 int machine__load_kallsyms(struct machine
*self
, const char *filename
,
2573 enum map_type type
, symbol_filter_t filter
)
2575 struct map
*map
= self
->vmlinux_maps
[type
];
2576 int ret
= dso__load_kallsyms(map
->dso
, filename
, map
, filter
);
2579 dso__set_loaded(map
->dso
, type
);
2581 * Since /proc/kallsyms will have multiple sessions for the
2582 * kernel, with modules between them, fixup the end of all
2585 __map_groups__fixup_end(&self
->kmaps
, type
);
2591 int machine__load_vmlinux_path(struct machine
*self
, enum map_type type
,
2592 symbol_filter_t filter
)
2594 struct map
*map
= self
->vmlinux_maps
[type
];
2595 int ret
= dso__load_vmlinux_path(map
->dso
, map
, filter
);
2598 dso__set_loaded(map
->dso
, type
);
2599 map__reloc_vmlinux(map
);