21 #include <sys/utsname.h>
24 #define KSYM_NAME_LEN 256
27 static int dso__load_kernel_sym(struct dso
*dso
, struct map
*map
,
28 symbol_filter_t filter
);
29 static int dso__load_guest_kernel_sym(struct dso
*dso
, struct map
*map
,
30 symbol_filter_t filter
);
31 int vmlinux_path__nr_entries
;
34 struct symbol_conf symbol_conf
= {
36 .try_vmlinux_path
= true,
42 static enum dso_binary_type binary_type_symtab
[] = {
43 DSO_BINARY_TYPE__KALLSYMS
,
44 DSO_BINARY_TYPE__GUEST_KALLSYMS
,
45 DSO_BINARY_TYPE__JAVA_JIT
,
46 DSO_BINARY_TYPE__DEBUGLINK
,
47 DSO_BINARY_TYPE__BUILD_ID_CACHE
,
48 DSO_BINARY_TYPE__FEDORA_DEBUGINFO
,
49 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO
,
50 DSO_BINARY_TYPE__BUILDID_DEBUGINFO
,
51 DSO_BINARY_TYPE__SYSTEM_PATH_DSO
,
52 DSO_BINARY_TYPE__GUEST_KMODULE
,
53 DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE
,
54 DSO_BINARY_TYPE__NOT_FOUND
,
57 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
59 bool symbol_type__is_a(char symbol_type
, enum map_type map_type
)
61 symbol_type
= toupper(symbol_type
);
65 return symbol_type
== 'T' || symbol_type
== 'W';
67 return symbol_type
== 'D';
73 static int prefix_underscores_count(const char *str
)
75 const char *tail
= str
;
86 static int choose_best_symbol(struct symbol
*syma
, struct symbol
*symb
)
92 /* Prefer a symbol with non zero length */
93 a
= syma
->end
- syma
->start
;
94 b
= symb
->end
- symb
->start
;
95 if ((b
== 0) && (a
> 0))
97 else if ((a
== 0) && (b
> 0))
100 /* Prefer a non weak symbol over a weak one */
101 a
= syma
->binding
== STB_WEAK
;
102 b
= symb
->binding
== STB_WEAK
;
108 /* Prefer a global symbol over a non global one */
109 a
= syma
->binding
== STB_GLOBAL
;
110 b
= symb
->binding
== STB_GLOBAL
;
116 /* Prefer a symbol with less underscores */
117 a
= prefix_underscores_count(syma
->name
);
118 b
= prefix_underscores_count(symb
->name
);
124 /* Choose the symbol with the longest name */
125 na
= strlen(syma
->name
);
126 nb
= strlen(symb
->name
);
132 /* Avoid "SyS" kernel syscall aliases */
133 if (na
>= 3 && !strncmp(syma
->name
, "SyS", 3))
135 if (na
>= 10 && !strncmp(syma
->name
, "compat_SyS", 10))
141 void symbols__fixup_duplicate(struct rb_root
*symbols
)
144 struct symbol
*curr
, *next
;
146 nd
= rb_first(symbols
);
149 curr
= rb_entry(nd
, struct symbol
, rb_node
);
151 nd
= rb_next(&curr
->rb_node
);
152 next
= rb_entry(nd
, struct symbol
, rb_node
);
157 if (curr
->start
!= next
->start
)
160 if (choose_best_symbol(curr
, next
) == SYMBOL_A
) {
161 rb_erase(&next
->rb_node
, symbols
);
164 nd
= rb_next(&curr
->rb_node
);
165 rb_erase(&curr
->rb_node
, symbols
);
170 void symbols__fixup_end(struct rb_root
*symbols
)
172 struct rb_node
*nd
, *prevnd
= rb_first(symbols
);
173 struct symbol
*curr
, *prev
;
178 curr
= rb_entry(prevnd
, struct symbol
, rb_node
);
180 for (nd
= rb_next(prevnd
); nd
; nd
= rb_next(nd
)) {
182 curr
= rb_entry(nd
, struct symbol
, rb_node
);
184 if (prev
->end
== prev
->start
&& prev
->end
!= curr
->start
)
185 prev
->end
= curr
->start
- 1;
189 if (curr
->end
== curr
->start
)
190 curr
->end
= roundup(curr
->start
, 4096);
193 void __map_groups__fixup_end(struct map_groups
*mg
, enum map_type type
)
195 struct map
*prev
, *curr
;
196 struct rb_node
*nd
, *prevnd
= rb_first(&mg
->maps
[type
]);
201 curr
= rb_entry(prevnd
, struct map
, rb_node
);
203 for (nd
= rb_next(prevnd
); nd
; nd
= rb_next(nd
)) {
205 curr
= rb_entry(nd
, struct map
, rb_node
);
206 prev
->end
= curr
->start
- 1;
210 * We still haven't the actual symbols, so guess the
211 * last map final address.
216 struct symbol
*symbol__new(u64 start
, u64 len
, u8 binding
, const char *name
)
218 size_t namelen
= strlen(name
) + 1;
219 struct symbol
*sym
= calloc(1, (symbol_conf
.priv_size
+
220 sizeof(*sym
) + namelen
));
224 if (symbol_conf
.priv_size
)
225 sym
= ((void *)sym
) + symbol_conf
.priv_size
;
228 sym
->end
= len
? start
+ len
- 1 : start
;
229 sym
->binding
= binding
;
230 sym
->namelen
= namelen
- 1;
232 pr_debug4("%s: %s %#" PRIx64
"-%#" PRIx64
"\n",
233 __func__
, name
, start
, sym
->end
);
234 memcpy(sym
->name
, name
, namelen
);
239 void symbol__delete(struct symbol
*sym
)
241 free(((void *)sym
) - symbol_conf
.priv_size
);
244 size_t symbol__fprintf(struct symbol
*sym
, FILE *fp
)
246 return fprintf(fp
, " %" PRIx64
"-%" PRIx64
" %c %s\n",
247 sym
->start
, sym
->end
,
248 sym
->binding
== STB_GLOBAL
? 'g' :
249 sym
->binding
== STB_LOCAL
? 'l' : 'w',
253 size_t symbol__fprintf_symname_offs(const struct symbol
*sym
,
254 const struct addr_location
*al
, FILE *fp
)
256 unsigned long offset
;
259 if (sym
&& sym
->name
) {
260 length
= fprintf(fp
, "%s", sym
->name
);
262 offset
= al
->addr
- sym
->start
;
263 length
+= fprintf(fp
, "+0x%lx", offset
);
267 return fprintf(fp
, "[unknown]");
270 size_t symbol__fprintf_symname(const struct symbol
*sym
, FILE *fp
)
272 return symbol__fprintf_symname_offs(sym
, NULL
, fp
);
275 void symbols__delete(struct rb_root
*symbols
)
278 struct rb_node
*next
= rb_first(symbols
);
281 pos
= rb_entry(next
, struct symbol
, rb_node
);
282 next
= rb_next(&pos
->rb_node
);
283 rb_erase(&pos
->rb_node
, symbols
);
288 void symbols__insert(struct rb_root
*symbols
, struct symbol
*sym
)
290 struct rb_node
**p
= &symbols
->rb_node
;
291 struct rb_node
*parent
= NULL
;
292 const u64 ip
= sym
->start
;
297 s
= rb_entry(parent
, struct symbol
, rb_node
);
303 rb_link_node(&sym
->rb_node
, parent
, p
);
304 rb_insert_color(&sym
->rb_node
, symbols
);
307 static struct symbol
*symbols__find(struct rb_root
*symbols
, u64 ip
)
314 n
= symbols
->rb_node
;
317 struct symbol
*s
= rb_entry(n
, struct symbol
, rb_node
);
321 else if (ip
> s
->end
)
330 struct symbol_name_rb_node
{
331 struct rb_node rb_node
;
335 static void symbols__insert_by_name(struct rb_root
*symbols
, struct symbol
*sym
)
337 struct rb_node
**p
= &symbols
->rb_node
;
338 struct rb_node
*parent
= NULL
;
339 struct symbol_name_rb_node
*symn
, *s
;
341 symn
= container_of(sym
, struct symbol_name_rb_node
, sym
);
345 s
= rb_entry(parent
, struct symbol_name_rb_node
, rb_node
);
346 if (strcmp(sym
->name
, s
->sym
.name
) < 0)
351 rb_link_node(&symn
->rb_node
, parent
, p
);
352 rb_insert_color(&symn
->rb_node
, symbols
);
355 static void symbols__sort_by_name(struct rb_root
*symbols
,
356 struct rb_root
*source
)
360 for (nd
= rb_first(source
); nd
; nd
= rb_next(nd
)) {
361 struct symbol
*pos
= rb_entry(nd
, struct symbol
, rb_node
);
362 symbols__insert_by_name(symbols
, pos
);
366 static struct symbol
*symbols__find_by_name(struct rb_root
*symbols
,
374 n
= symbols
->rb_node
;
377 struct symbol_name_rb_node
*s
;
380 s
= rb_entry(n
, struct symbol_name_rb_node
, rb_node
);
381 cmp
= strcmp(name
, s
->sym
.name
);
394 struct symbol
*dso__find_symbol(struct dso
*dso
,
395 enum map_type type
, u64 addr
)
397 return symbols__find(&dso
->symbols
[type
], addr
);
400 struct symbol
*dso__find_symbol_by_name(struct dso
*dso
, enum map_type type
,
403 return symbols__find_by_name(&dso
->symbol_names
[type
], name
);
406 void dso__sort_by_name(struct dso
*dso
, enum map_type type
)
408 dso__set_sorted_by_name(dso
, type
);
409 return symbols__sort_by_name(&dso
->symbol_names
[type
],
410 &dso
->symbols
[type
]);
413 size_t dso__fprintf_symbols_by_name(struct dso
*dso
,
414 enum map_type type
, FILE *fp
)
418 struct symbol_name_rb_node
*pos
;
420 for (nd
= rb_first(&dso
->symbol_names
[type
]); nd
; nd
= rb_next(nd
)) {
421 pos
= rb_entry(nd
, struct symbol_name_rb_node
, rb_node
);
422 fprintf(fp
, "%s\n", pos
->sym
.name
);
428 int kallsyms__parse(const char *filename
, void *arg
,
429 int (*process_symbol
)(void *arg
, const char *name
,
430 char type
, u64 start
))
435 FILE *file
= fopen(filename
, "r");
442 while (!feof(file
)) {
448 line_len
= getline(&line
, &n
, file
);
449 if (line_len
< 0 || !line
)
452 line
[--line_len
] = '\0'; /* \n */
454 len
= hex2u64(line
, &start
);
457 if (len
+ 2 >= line_len
)
460 symbol_type
= line
[len
];
462 symbol_name
= line
+ len
;
463 len
= line_len
- len
;
465 if (len
>= KSYM_NAME_LEN
) {
470 err
= process_symbol(arg
, symbol_name
,
484 struct process_kallsyms_args
{
489 static u8
kallsyms2elf_type(char type
)
494 return isupper(type
) ? STB_GLOBAL
: STB_LOCAL
;
497 static int map__process_kallsym_symbol(void *arg
, const char *name
,
498 char type
, u64 start
)
501 struct process_kallsyms_args
*a
= arg
;
502 struct rb_root
*root
= &a
->dso
->symbols
[a
->map
->type
];
504 if (!symbol_type__is_a(type
, a
->map
->type
))
508 * module symbols are not sorted so we add all
509 * symbols, setting length to 0, and rely on
510 * symbols__fixup_end() to fix it up.
512 sym
= symbol__new(start
, 0, kallsyms2elf_type(type
), name
);
516 * We will pass the symbols to the filter later, in
517 * map__split_kallsyms, when we have split the maps per module
519 symbols__insert(root
, sym
);
525 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
526 * so that we can in the next step set the symbol ->end address and then
527 * call kernel_maps__split_kallsyms.
529 static int dso__load_all_kallsyms(struct dso
*dso
, const char *filename
,
532 struct process_kallsyms_args args
= { .map
= map
, .dso
= dso
, };
533 return kallsyms__parse(filename
, &args
, map__process_kallsym_symbol
);
537 * Split the symbols into maps, making sure there are no overlaps, i.e. the
538 * kernel range is broken in several maps, named [kernel].N, as we don't have
539 * the original ELF section names vmlinux have.
541 static int dso__split_kallsyms(struct dso
*dso
, struct map
*map
,
542 symbol_filter_t filter
)
544 struct map_groups
*kmaps
= map__kmap(map
)->kmaps
;
545 struct machine
*machine
= kmaps
->machine
;
546 struct map
*curr_map
= map
;
548 int count
= 0, moved
= 0;
549 struct rb_root
*root
= &dso
->symbols
[map
->type
];
550 struct rb_node
*next
= rb_first(root
);
551 int kernel_range
= 0;
556 pos
= rb_entry(next
, struct symbol
, rb_node
);
557 next
= rb_next(&pos
->rb_node
);
559 module
= strchr(pos
->name
, '\t');
561 if (!symbol_conf
.use_modules
)
566 if (strcmp(curr_map
->dso
->short_name
, module
)) {
567 if (curr_map
!= map
&&
568 dso
->kernel
== DSO_TYPE_GUEST_KERNEL
&&
569 machine__is_default_guest(machine
)) {
571 * We assume all symbols of a module are
572 * continuous in * kallsyms, so curr_map
573 * points to a module and all its
574 * symbols are in its kmap. Mark it as
577 dso__set_loaded(curr_map
->dso
,
581 curr_map
= map_groups__find_by_name(kmaps
,
583 if (curr_map
== NULL
) {
584 pr_debug("%s/proc/{kallsyms,modules} "
585 "inconsistency while looking "
586 "for \"%s\" module!\n",
587 machine
->root_dir
, module
);
592 if (curr_map
->dso
->loaded
&&
593 !machine__is_default_guest(machine
))
597 * So that we look just like we get from .ko files,
598 * i.e. not prelinked, relative to map->start.
600 pos
->start
= curr_map
->map_ip(curr_map
, pos
->start
);
601 pos
->end
= curr_map
->map_ip(curr_map
, pos
->end
);
602 } else if (curr_map
!= map
) {
603 char dso_name
[PATH_MAX
];
611 if (dso
->kernel
== DSO_TYPE_GUEST_KERNEL
)
612 snprintf(dso_name
, sizeof(dso_name
),
616 snprintf(dso_name
, sizeof(dso_name
),
620 ndso
= dso__new(dso_name
);
624 ndso
->kernel
= dso
->kernel
;
626 curr_map
= map__new2(pos
->start
, ndso
, map
->type
);
627 if (curr_map
== NULL
) {
632 curr_map
->map_ip
= curr_map
->unmap_ip
= identity__map_ip
;
633 map_groups__insert(kmaps
, curr_map
);
637 if (filter
&& filter(curr_map
, pos
)) {
638 discard_symbol
: rb_erase(&pos
->rb_node
, root
);
641 if (curr_map
!= map
) {
642 rb_erase(&pos
->rb_node
, root
);
643 symbols__insert(&curr_map
->dso
->symbols
[curr_map
->type
], pos
);
650 if (curr_map
!= map
&&
651 dso
->kernel
== DSO_TYPE_GUEST_KERNEL
&&
652 machine__is_default_guest(kmaps
->machine
)) {
653 dso__set_loaded(curr_map
->dso
, curr_map
->type
);
656 return count
+ moved
;
659 bool symbol__restricted_filename(const char *filename
,
660 const char *restricted_filename
)
662 bool restricted
= false;
664 if (symbol_conf
.kptr_restrict
) {
665 char *r
= realpath(filename
, NULL
);
668 restricted
= strcmp(r
, restricted_filename
) == 0;
677 int dso__load_kallsyms(struct dso
*dso
, const char *filename
,
678 struct map
*map
, symbol_filter_t filter
)
680 if (symbol__restricted_filename(filename
, "/proc/kallsyms"))
683 if (dso__load_all_kallsyms(dso
, filename
, map
) < 0)
686 symbols__fixup_duplicate(&dso
->symbols
[map
->type
]);
687 symbols__fixup_end(&dso
->symbols
[map
->type
]);
689 if (dso
->kernel
== DSO_TYPE_GUEST_KERNEL
)
690 dso
->symtab_type
= DSO_BINARY_TYPE__GUEST_KALLSYMS
;
692 dso
->symtab_type
= DSO_BINARY_TYPE__KALLSYMS
;
694 return dso__split_kallsyms(dso
, map
, filter
);
697 static int dso__load_perf_map(struct dso
*dso
, struct map
*map
,
698 symbol_filter_t filter
)
705 file
= fopen(dso
->long_name
, "r");
709 while (!feof(file
)) {
714 line_len
= getline(&line
, &n
, file
);
721 line
[--line_len
] = '\0'; /* \n */
723 len
= hex2u64(line
, &start
);
726 if (len
+ 2 >= line_len
)
729 len
+= hex2u64(line
+ len
, &size
);
732 if (len
+ 2 >= line_len
)
735 sym
= symbol__new(start
, size
, STB_GLOBAL
, line
+ len
);
738 goto out_delete_line
;
740 if (filter
&& filter(map
, sym
))
743 symbols__insert(&dso
->symbols
[map
->type
], sym
);
759 int dso__load(struct dso
*dso
, struct map
*map
, symbol_filter_t filter
)
764 struct machine
*machine
;
765 char *root_dir
= (char *) "";
767 struct symsrc ss_
[2];
768 struct symsrc
*syms_ss
= NULL
, *runtime_ss
= NULL
;
770 dso__set_loaded(dso
, map
->type
);
772 if (dso
->kernel
== DSO_TYPE_KERNEL
)
773 return dso__load_kernel_sym(dso
, map
, filter
);
774 else if (dso
->kernel
== DSO_TYPE_GUEST_KERNEL
)
775 return dso__load_guest_kernel_sym(dso
, map
, filter
);
777 if (map
->groups
&& map
->groups
->machine
)
778 machine
= map
->groups
->machine
;
782 dso
->adjust_symbols
= 0;
784 if (strncmp(dso
->name
, "/tmp/perf-", 10) == 0) {
787 if (lstat(dso
->name
, &st
) < 0)
790 if (st
.st_uid
&& (st
.st_uid
!= geteuid())) {
791 pr_warning("File %s not owned by current user or root, "
792 "ignoring it.\n", dso
->name
);
796 ret
= dso__load_perf_map(dso
, map
, filter
);
797 dso
->symtab_type
= ret
> 0 ? DSO_BINARY_TYPE__JAVA_JIT
:
798 DSO_BINARY_TYPE__NOT_FOUND
;
803 root_dir
= machine
->root_dir
;
805 name
= malloc(PATH_MAX
);
809 /* Iterate over candidate debug images.
810 * Keep track of "interesting" ones (those which have a symtab, dynsym,
811 * and/or opd section) for processing.
813 for (i
= 0; i
< DSO_BINARY_TYPE__SYMTAB_CNT
; i
++) {
814 struct symsrc
*ss
= &ss_
[ss_pos
];
815 bool next_slot
= false;
817 enum dso_binary_type symtab_type
= binary_type_symtab
[i
];
819 if (dso__binary_type_file(dso
, symtab_type
,
820 root_dir
, name
, PATH_MAX
))
823 /* Name is now the name of the next image to try */
824 if (symsrc__init(ss
, dso
, name
, symtab_type
) < 0)
827 if (!syms_ss
&& symsrc__has_symtab(ss
)) {
832 if (!runtime_ss
&& symsrc__possibly_runtime(ss
)) {
840 if (syms_ss
&& runtime_ss
)
846 if (!runtime_ss
&& !syms_ss
)
849 if (runtime_ss
&& !syms_ss
) {
850 syms_ss
= runtime_ss
;
853 /* We'll have to hope for the best */
854 if (!runtime_ss
&& syms_ss
)
855 runtime_ss
= syms_ss
;
858 ret
= dso__load_sym(dso
, map
, syms_ss
, runtime_ss
, filter
, 0);
865 nr_plt
= dso__synthesize_plt_symbols(dso
, runtime_ss
, map
, filter
);
870 for (; ss_pos
> 0; ss_pos
--)
871 symsrc__destroy(&ss_
[ss_pos
- 1]);
874 if (ret
< 0 && strstr(dso
->name
, " (deleted)") != NULL
)
879 struct map
*map_groups__find_by_name(struct map_groups
*mg
,
880 enum map_type type
, const char *name
)
884 for (nd
= rb_first(&mg
->maps
[type
]); nd
; nd
= rb_next(nd
)) {
885 struct map
*map
= rb_entry(nd
, struct map
, rb_node
);
887 if (map
->dso
&& strcmp(map
->dso
->short_name
, name
) == 0)
894 int dso__load_vmlinux(struct dso
*dso
, struct map
*map
,
895 const char *vmlinux
, symbol_filter_t filter
)
899 char symfs_vmlinux
[PATH_MAX
];
900 enum dso_binary_type symtab_type
;
902 if (vmlinux
[0] == '/')
903 snprintf(symfs_vmlinux
, sizeof(symfs_vmlinux
), "%s", vmlinux
);
905 snprintf(symfs_vmlinux
, sizeof(symfs_vmlinux
), "%s%s",
906 symbol_conf
.symfs
, vmlinux
);
908 if (dso
->kernel
== DSO_TYPE_GUEST_KERNEL
)
909 symtab_type
= DSO_BINARY_TYPE__GUEST_VMLINUX
;
911 symtab_type
= DSO_BINARY_TYPE__VMLINUX
;
913 if (symsrc__init(&ss
, dso
, symfs_vmlinux
, symtab_type
))
916 err
= dso__load_sym(dso
, map
, &ss
, &ss
, filter
, 0);
917 symsrc__destroy(&ss
);
920 dso__set_long_name(dso
, (char *)vmlinux
);
921 dso__set_loaded(dso
, map
->type
);
922 pr_debug("Using %s for symbols\n", symfs_vmlinux
);
928 int dso__load_vmlinux_path(struct dso
*dso
, struct map
*map
,
929 symbol_filter_t filter
)
934 pr_debug("Looking at the vmlinux_path (%d entries long)\n",
935 vmlinux_path__nr_entries
+ 1);
937 filename
= dso__build_id_filename(dso
, NULL
, 0);
938 if (filename
!= NULL
) {
939 err
= dso__load_vmlinux(dso
, map
, filename
, filter
);
941 dso
->lname_alloc
= 1;
947 for (i
= 0; i
< vmlinux_path__nr_entries
; ++i
) {
948 err
= dso__load_vmlinux(dso
, map
, vmlinux_path
[i
], filter
);
950 dso__set_long_name(dso
, strdup(vmlinux_path
[i
]));
951 dso
->lname_alloc
= 1;
959 static int dso__load_kernel_sym(struct dso
*dso
, struct map
*map
,
960 symbol_filter_t filter
)
963 const char *kallsyms_filename
= NULL
;
964 char *kallsyms_allocated_filename
= NULL
;
966 * Step 1: if the user specified a kallsyms or vmlinux filename, use
967 * it and only it, reporting errors to the user if it cannot be used.
969 * For instance, try to analyse an ARM perf.data file _without_ a
970 * build-id, or if the user specifies the wrong path to the right
971 * vmlinux file, obviously we can't fallback to another vmlinux (a
972 * x86_86 one, on the machine where analysis is being performed, say),
973 * or worse, /proc/kallsyms.
975 * If the specified file _has_ a build-id and there is a build-id
976 * section in the perf.data file, we will still do the expected
977 * validation in dso__load_vmlinux and will bail out if they don't
980 if (symbol_conf
.kallsyms_name
!= NULL
) {
981 kallsyms_filename
= symbol_conf
.kallsyms_name
;
985 if (symbol_conf
.vmlinux_name
!= NULL
) {
986 err
= dso__load_vmlinux(dso
, map
,
987 symbol_conf
.vmlinux_name
, filter
);
989 dso__set_long_name(dso
,
990 strdup(symbol_conf
.vmlinux_name
));
991 dso
->lname_alloc
= 1;
997 if (vmlinux_path
!= NULL
) {
998 err
= dso__load_vmlinux_path(dso
, map
, filter
);
1003 /* do not try local files if a symfs was given */
1004 if (symbol_conf
.symfs
[0] != 0)
1008 * Say the kernel DSO was created when processing the build-id header table,
1009 * we have a build-id, so check if it is the same as the running kernel,
1010 * using it if it is.
1012 if (dso
->has_build_id
) {
1013 u8 kallsyms_build_id
[BUILD_ID_SIZE
];
1014 char sbuild_id
[BUILD_ID_SIZE
* 2 + 1];
1016 if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id
,
1017 sizeof(kallsyms_build_id
)) == 0) {
1018 if (dso__build_id_equal(dso
, kallsyms_build_id
)) {
1019 kallsyms_filename
= "/proc/kallsyms";
1024 * Now look if we have it on the build-id cache in
1025 * $HOME/.debug/[kernel.kallsyms].
1027 build_id__sprintf(dso
->build_id
, sizeof(dso
->build_id
),
1030 if (asprintf(&kallsyms_allocated_filename
,
1031 "%s/.debug/[kernel.kallsyms]/%s",
1032 getenv("HOME"), sbuild_id
) == -1) {
1033 pr_err("Not enough memory for kallsyms file lookup\n");
1037 kallsyms_filename
= kallsyms_allocated_filename
;
1039 if (access(kallsyms_filename
, F_OK
)) {
1040 pr_err("No kallsyms or vmlinux with build-id %s "
1041 "was found\n", sbuild_id
);
1042 free(kallsyms_allocated_filename
);
1047 * Last resort, if we don't have a build-id and couldn't find
1048 * any vmlinux file, try the running kernel kallsyms table.
1050 kallsyms_filename
= "/proc/kallsyms";
1054 err
= dso__load_kallsyms(dso
, kallsyms_filename
, map
, filter
);
1056 pr_debug("Using %s for symbols\n", kallsyms_filename
);
1057 free(kallsyms_allocated_filename
);
1060 dso__set_long_name(dso
, strdup("[kernel.kallsyms]"));
1062 map__fixup_start(map
);
1063 map__fixup_end(map
);
1069 static int dso__load_guest_kernel_sym(struct dso
*dso
, struct map
*map
,
1070 symbol_filter_t filter
)
1073 const char *kallsyms_filename
= NULL
;
1074 struct machine
*machine
;
1075 char path
[PATH_MAX
];
1078 pr_debug("Guest kernel map hasn't the point to groups\n");
1081 machine
= map
->groups
->machine
;
1083 if (machine__is_default_guest(machine
)) {
1085 * if the user specified a vmlinux filename, use it and only
1086 * it, reporting errors to the user if it cannot be used.
1087 * Or use file guest_kallsyms inputted by user on commandline
1089 if (symbol_conf
.default_guest_vmlinux_name
!= NULL
) {
1090 err
= dso__load_vmlinux(dso
, map
,
1091 symbol_conf
.default_guest_vmlinux_name
, filter
);
1095 kallsyms_filename
= symbol_conf
.default_guest_kallsyms
;
1096 if (!kallsyms_filename
)
1099 sprintf(path
, "%s/proc/kallsyms", machine
->root_dir
);
1100 kallsyms_filename
= path
;
1103 err
= dso__load_kallsyms(dso
, kallsyms_filename
, map
, filter
);
1105 pr_debug("Using %s for symbols\n", kallsyms_filename
);
1109 if (kallsyms_filename
!= NULL
) {
1110 machine__mmap_name(machine
, path
, sizeof(path
));
1111 dso__set_long_name(dso
, strdup(path
));
1113 map__fixup_start(map
);
1114 map__fixup_end(map
);
1120 static void vmlinux_path__exit(void)
1122 while (--vmlinux_path__nr_entries
>= 0) {
1123 free(vmlinux_path
[vmlinux_path__nr_entries
]);
1124 vmlinux_path
[vmlinux_path__nr_entries
] = NULL
;
1128 vmlinux_path
= NULL
;
1131 static int vmlinux_path__init(void)
1136 vmlinux_path
= malloc(sizeof(char *) * 5);
1137 if (vmlinux_path
== NULL
)
1140 vmlinux_path
[vmlinux_path__nr_entries
] = strdup("vmlinux");
1141 if (vmlinux_path
[vmlinux_path__nr_entries
] == NULL
)
1143 ++vmlinux_path__nr_entries
;
1144 vmlinux_path
[vmlinux_path__nr_entries
] = strdup("/boot/vmlinux");
1145 if (vmlinux_path
[vmlinux_path__nr_entries
] == NULL
)
1147 ++vmlinux_path__nr_entries
;
1149 /* only try running kernel version if no symfs was given */
1150 if (symbol_conf
.symfs
[0] != 0)
1153 if (uname(&uts
) < 0)
1156 snprintf(bf
, sizeof(bf
), "/boot/vmlinux-%s", uts
.release
);
1157 vmlinux_path
[vmlinux_path__nr_entries
] = strdup(bf
);
1158 if (vmlinux_path
[vmlinux_path__nr_entries
] == NULL
)
1160 ++vmlinux_path__nr_entries
;
1161 snprintf(bf
, sizeof(bf
), "/lib/modules/%s/build/vmlinux", uts
.release
);
1162 vmlinux_path
[vmlinux_path__nr_entries
] = strdup(bf
);
1163 if (vmlinux_path
[vmlinux_path__nr_entries
] == NULL
)
1165 ++vmlinux_path__nr_entries
;
1166 snprintf(bf
, sizeof(bf
), "/usr/lib/debug/lib/modules/%s/vmlinux",
1168 vmlinux_path
[vmlinux_path__nr_entries
] = strdup(bf
);
1169 if (vmlinux_path
[vmlinux_path__nr_entries
] == NULL
)
1171 ++vmlinux_path__nr_entries
;
1176 vmlinux_path__exit();
1180 static int setup_list(struct strlist
**list
, const char *list_str
,
1181 const char *list_name
)
1183 if (list_str
== NULL
)
1186 *list
= strlist__new(true, list_str
);
1188 pr_err("problems parsing %s list\n", list_name
);
1194 static bool symbol__read_kptr_restrict(void)
1198 if (geteuid() != 0) {
1199 FILE *fp
= fopen("/proc/sys/kernel/kptr_restrict", "r");
1203 if (fgets(line
, sizeof(line
), fp
) != NULL
)
1204 value
= atoi(line
) != 0;
1213 int symbol__init(void)
1217 if (symbol_conf
.initialized
)
1220 symbol_conf
.priv_size
= PERF_ALIGN(symbol_conf
.priv_size
, sizeof(u64
));
1224 if (symbol_conf
.sort_by_name
)
1225 symbol_conf
.priv_size
+= (sizeof(struct symbol_name_rb_node
) -
1226 sizeof(struct symbol
));
1228 if (symbol_conf
.try_vmlinux_path
&& vmlinux_path__init() < 0)
1231 if (symbol_conf
.field_sep
&& *symbol_conf
.field_sep
== '.') {
1232 pr_err("'.' is the only non valid --field-separator argument\n");
1236 if (setup_list(&symbol_conf
.dso_list
,
1237 symbol_conf
.dso_list_str
, "dso") < 0)
1240 if (setup_list(&symbol_conf
.comm_list
,
1241 symbol_conf
.comm_list_str
, "comm") < 0)
1242 goto out_free_dso_list
;
1244 if (setup_list(&symbol_conf
.sym_list
,
1245 symbol_conf
.sym_list_str
, "symbol") < 0)
1246 goto out_free_comm_list
;
1249 * A path to symbols of "/" is identical to ""
1250 * reset here for simplicity.
1252 symfs
= realpath(symbol_conf
.symfs
, NULL
);
1254 symfs
= symbol_conf
.symfs
;
1255 if (strcmp(symfs
, "/") == 0)
1256 symbol_conf
.symfs
= "";
1257 if (symfs
!= symbol_conf
.symfs
)
1258 free((void *)symfs
);
1260 symbol_conf
.kptr_restrict
= symbol__read_kptr_restrict();
1262 symbol_conf
.initialized
= true;
1266 strlist__delete(symbol_conf
.comm_list
);
1268 strlist__delete(symbol_conf
.dso_list
);
1272 void symbol__exit(void)
1274 if (!symbol_conf
.initialized
)
1276 strlist__delete(symbol_conf
.sym_list
);
1277 strlist__delete(symbol_conf
.dso_list
);
1278 strlist__delete(symbol_conf
.comm_list
);
1279 vmlinux_path__exit();
1280 symbol_conf
.sym_list
= symbol_conf
.dso_list
= symbol_conf
.comm_list
= NULL
;
1281 symbol_conf
.initialized
= false;