9 #include "demangle-java.h"
10 #include "demangle-rust.h"
14 #include "sane_ctype.h"
15 #include <symbol/kallsyms.h>
18 #define EM_AARCH64 183 /* ARM 64 bit */
21 typedef Elf64_Nhdr GElf_Nhdr
;
23 #ifdef HAVE_CPLUS_DEMANGLE_SUPPORT
24 extern char *cplus_demangle(const char *, int);
26 static inline char *bfd_demangle(void __maybe_unused
*v
, const char *c
, int i
)
28 return cplus_demangle(c
, i
);
32 static inline char *bfd_demangle(void __maybe_unused
*v
,
33 const char __maybe_unused
*c
,
39 #define PACKAGE 'perf'
44 #ifndef HAVE_ELF_GETPHDRNUM_SUPPORT
45 static int elf_getphdrnum(Elf
*elf
, size_t *dst
)
50 ehdr
= gelf_getehdr(elf
, &gehdr
);
60 #ifndef HAVE_ELF_GETSHDRSTRNDX_SUPPORT
61 static int elf_getshdrstrndx(Elf
*elf __maybe_unused
, size_t *dst __maybe_unused
)
63 pr_err("%s: update your libelf to > 0.140, this one lacks elf_getshdrstrndx().\n", __func__
);
68 #ifndef NT_GNU_BUILD_ID
69 #define NT_GNU_BUILD_ID 3
73 * elf_symtab__for_each_symbol - iterate thru all the symbols
75 * @syms: struct elf_symtab instance to iterate
77 * @sym: GElf_Sym iterator
79 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
80 for (idx = 0, gelf_getsym(syms, idx, &sym);\
82 idx++, gelf_getsym(syms, idx, &sym))
84 static inline uint8_t elf_sym__type(const GElf_Sym
*sym
)
86 return GELF_ST_TYPE(sym
->st_info
);
90 #define STT_GNU_IFUNC 10
93 static inline int elf_sym__is_function(const GElf_Sym
*sym
)
95 return (elf_sym__type(sym
) == STT_FUNC
||
96 elf_sym__type(sym
) == STT_GNU_IFUNC
) &&
98 sym
->st_shndx
!= SHN_UNDEF
;
101 static inline bool elf_sym__is_object(const GElf_Sym
*sym
)
103 return elf_sym__type(sym
) == STT_OBJECT
&&
105 sym
->st_shndx
!= SHN_UNDEF
;
108 static inline int elf_sym__is_label(const GElf_Sym
*sym
)
110 return elf_sym__type(sym
) == STT_NOTYPE
&&
112 sym
->st_shndx
!= SHN_UNDEF
&&
113 sym
->st_shndx
!= SHN_ABS
;
116 static bool elf_sym__is_a(GElf_Sym
*sym
, enum map_type type
)
120 return elf_sym__is_function(sym
);
122 return elf_sym__is_object(sym
);
128 static inline const char *elf_sym__name(const GElf_Sym
*sym
,
129 const Elf_Data
*symstrs
)
131 return symstrs
->d_buf
+ sym
->st_name
;
134 static inline const char *elf_sec__name(const GElf_Shdr
*shdr
,
135 const Elf_Data
*secstrs
)
137 return secstrs
->d_buf
+ shdr
->sh_name
;
140 static inline int elf_sec__is_text(const GElf_Shdr
*shdr
,
141 const Elf_Data
*secstrs
)
143 return strstr(elf_sec__name(shdr
, secstrs
), "text") != NULL
;
146 static inline bool elf_sec__is_data(const GElf_Shdr
*shdr
,
147 const Elf_Data
*secstrs
)
149 return strstr(elf_sec__name(shdr
, secstrs
), "data") != NULL
;
152 static bool elf_sec__is_a(GElf_Shdr
*shdr
, Elf_Data
*secstrs
,
157 return elf_sec__is_text(shdr
, secstrs
);
159 return elf_sec__is_data(shdr
, secstrs
);
165 static size_t elf_addr_to_index(Elf
*elf
, GElf_Addr addr
)
171 while ((sec
= elf_nextscn(elf
, sec
)) != NULL
) {
172 gelf_getshdr(sec
, &shdr
);
174 if ((addr
>= shdr
.sh_addr
) &&
175 (addr
< (shdr
.sh_addr
+ shdr
.sh_size
)))
184 Elf_Scn
*elf_section_by_name(Elf
*elf
, GElf_Ehdr
*ep
,
185 GElf_Shdr
*shp
, const char *name
, size_t *idx
)
190 /* Elf is corrupted/truncated, avoid calling elf_strptr. */
191 if (!elf_rawdata(elf_getscn(elf
, ep
->e_shstrndx
), NULL
))
194 while ((sec
= elf_nextscn(elf
, sec
)) != NULL
) {
197 gelf_getshdr(sec
, shp
);
198 str
= elf_strptr(elf
, ep
->e_shstrndx
, shp
->sh_name
);
199 if (str
&& !strcmp(name
, str
)) {
210 static bool want_demangle(bool is_kernel_sym
)
212 return is_kernel_sym
? symbol_conf
.demangle_kernel
: symbol_conf
.demangle
;
215 static char *demangle_sym(struct dso
*dso
, int kmodule
, const char *elf_name
)
217 int demangle_flags
= verbose
> 0 ? (DMGL_PARAMS
| DMGL_ANSI
) : DMGL_NO_OPTS
;
218 char *demangled
= NULL
;
221 * We need to figure out if the object was created from C++ sources
222 * DWARF DW_compile_unit has this, but we don't always have access
225 if (!want_demangle(dso
->kernel
|| kmodule
))
228 demangled
= bfd_demangle(NULL
, elf_name
, demangle_flags
);
229 if (demangled
== NULL
)
230 demangled
= java_demangle_sym(elf_name
, JAVA_DEMANGLE_NORET
);
231 else if (rust_is_mangled(demangled
))
233 * Input to Rust demangling is the BFD-demangled
234 * name which it Rust-demangles in place.
236 rust_demangle_sym(demangled
);
241 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
242 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
244 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
246 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
247 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
249 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
252 * We need to check if we have a .dynsym, so that we can handle the
253 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
254 * .dynsym or .symtab).
255 * And always look at the original dso, not at debuginfo packages, that
256 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
258 int dso__synthesize_plt_symbols(struct dso
*dso
, struct symsrc
*ss
, struct map
*map
)
260 uint32_t nr_rel_entries
, idx
;
265 GElf_Shdr shdr_rel_plt
, shdr_dynsym
;
266 Elf_Data
*reldata
, *syms
, *symstrs
;
267 Elf_Scn
*scn_plt_rel
, *scn_symstrs
, *scn_dynsym
;
270 char sympltname
[1024];
272 int nr
= 0, symidx
, err
= 0;
280 scn_dynsym
= ss
->dynsym
;
281 shdr_dynsym
= ss
->dynshdr
;
282 dynsym_idx
= ss
->dynsym_idx
;
284 if (scn_dynsym
== NULL
)
287 scn_plt_rel
= elf_section_by_name(elf
, &ehdr
, &shdr_rel_plt
,
289 if (scn_plt_rel
== NULL
) {
290 scn_plt_rel
= elf_section_by_name(elf
, &ehdr
, &shdr_rel_plt
,
292 if (scn_plt_rel
== NULL
)
298 if (shdr_rel_plt
.sh_link
!= dynsym_idx
)
301 if (elf_section_by_name(elf
, &ehdr
, &shdr_plt
, ".plt", NULL
) == NULL
)
305 * Fetch the relocation section to find the idxes to the GOT
306 * and the symbols in the .dynsym they refer to.
308 reldata
= elf_getdata(scn_plt_rel
, NULL
);
312 syms
= elf_getdata(scn_dynsym
, NULL
);
316 scn_symstrs
= elf_getscn(elf
, shdr_dynsym
.sh_link
);
317 if (scn_symstrs
== NULL
)
320 symstrs
= elf_getdata(scn_symstrs
, NULL
);
324 if (symstrs
->d_size
== 0)
327 nr_rel_entries
= shdr_rel_plt
.sh_size
/ shdr_rel_plt
.sh_entsize
;
328 plt_offset
= shdr_plt
.sh_offset
;
330 if (shdr_rel_plt
.sh_type
== SHT_RELA
) {
331 GElf_Rela pos_mem
, *pos
;
333 elf_section__for_each_rela(reldata
, pos
, pos_mem
, idx
,
335 const char *elf_name
= NULL
;
336 char *demangled
= NULL
;
337 symidx
= GELF_R_SYM(pos
->r_info
);
338 plt_offset
+= shdr_plt
.sh_entsize
;
339 gelf_getsym(syms
, symidx
, &sym
);
341 elf_name
= elf_sym__name(&sym
, symstrs
);
342 demangled
= demangle_sym(dso
, 0, elf_name
);
343 if (demangled
!= NULL
)
344 elf_name
= demangled
;
345 snprintf(sympltname
, sizeof(sympltname
),
349 f
= symbol__new(plt_offset
, shdr_plt
.sh_entsize
,
350 STB_GLOBAL
, sympltname
);
354 symbols__insert(&dso
->symbols
[map
->type
], f
);
357 } else if (shdr_rel_plt
.sh_type
== SHT_REL
) {
358 GElf_Rel pos_mem
, *pos
;
359 elf_section__for_each_rel(reldata
, pos
, pos_mem
, idx
,
361 const char *elf_name
= NULL
;
362 char *demangled
= NULL
;
363 symidx
= GELF_R_SYM(pos
->r_info
);
364 plt_offset
+= shdr_plt
.sh_entsize
;
365 gelf_getsym(syms
, symidx
, &sym
);
367 elf_name
= elf_sym__name(&sym
, symstrs
);
368 demangled
= demangle_sym(dso
, 0, elf_name
);
369 if (demangled
!= NULL
)
370 elf_name
= demangled
;
371 snprintf(sympltname
, sizeof(sympltname
),
375 f
= symbol__new(plt_offset
, shdr_plt
.sh_entsize
,
376 STB_GLOBAL
, sympltname
);
380 symbols__insert(&dso
->symbols
[map
->type
], f
);
389 pr_debug("%s: problems reading %s PLT info.\n",
390 __func__
, dso
->long_name
);
394 char *dso__demangle_sym(struct dso
*dso
, int kmodule
, char *elf_name
)
396 return demangle_sym(dso
, kmodule
, elf_name
);
400 * Align offset to 4 bytes as needed for note name and descriptor data.
402 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
404 static int elf_read_build_id(Elf
*elf
, void *bf
, size_t size
)
414 if (size
< BUILD_ID_SIZE
)
421 if (gelf_getehdr(elf
, &ehdr
) == NULL
) {
422 pr_err("%s: cannot get elf header.\n", __func__
);
427 * Check following sections for notes:
428 * '.note.gnu.build-id'
430 * '.note' (VDSO specific)
433 sec
= elf_section_by_name(elf
, &ehdr
, &shdr
,
434 ".note.gnu.build-id", NULL
);
438 sec
= elf_section_by_name(elf
, &ehdr
, &shdr
,
443 sec
= elf_section_by_name(elf
, &ehdr
, &shdr
,
452 data
= elf_getdata(sec
, NULL
);
457 while (ptr
< (data
->d_buf
+ data
->d_size
)) {
458 GElf_Nhdr
*nhdr
= ptr
;
459 size_t namesz
= NOTE_ALIGN(nhdr
->n_namesz
),
460 descsz
= NOTE_ALIGN(nhdr
->n_descsz
);
463 ptr
+= sizeof(*nhdr
);
466 if (nhdr
->n_type
== NT_GNU_BUILD_ID
&&
467 nhdr
->n_namesz
== sizeof("GNU")) {
468 if (memcmp(name
, "GNU", sizeof("GNU")) == 0) {
469 size_t sz
= min(size
, descsz
);
471 memset(bf
+ sz
, 0, size
- sz
);
483 int filename__read_build_id(const char *filename
, void *bf
, size_t size
)
488 if (size
< BUILD_ID_SIZE
)
491 fd
= open(filename
, O_RDONLY
);
495 elf
= elf_begin(fd
, PERF_ELF_C_READ_MMAP
, NULL
);
497 pr_debug2("%s: cannot read %s ELF file.\n", __func__
, filename
);
501 err
= elf_read_build_id(elf
, bf
, size
);
510 int sysfs__read_build_id(const char *filename
, void *build_id
, size_t size
)
514 if (size
< BUILD_ID_SIZE
)
517 fd
= open(filename
, O_RDONLY
);
524 size_t namesz
, descsz
;
526 if (read(fd
, &nhdr
, sizeof(nhdr
)) != sizeof(nhdr
))
529 namesz
= NOTE_ALIGN(nhdr
.n_namesz
);
530 descsz
= NOTE_ALIGN(nhdr
.n_descsz
);
531 if (nhdr
.n_type
== NT_GNU_BUILD_ID
&&
532 nhdr
.n_namesz
== sizeof("GNU")) {
533 if (read(fd
, bf
, namesz
) != (ssize_t
)namesz
)
535 if (memcmp(bf
, "GNU", sizeof("GNU")) == 0) {
536 size_t sz
= min(descsz
, size
);
537 if (read(fd
, build_id
, sz
) == (ssize_t
)sz
) {
538 memset(build_id
+ sz
, 0, size
- sz
);
542 } else if (read(fd
, bf
, descsz
) != (ssize_t
)descsz
)
545 int n
= namesz
+ descsz
;
547 if (n
> (int)sizeof(bf
)) {
549 pr_debug("%s: truncating reading of build id in sysfs file %s: n_namesz=%u, n_descsz=%u.\n",
550 __func__
, filename
, nhdr
.n_namesz
, nhdr
.n_descsz
);
552 if (read(fd
, bf
, n
) != n
)
561 int filename__read_debuglink(const char *filename
, char *debuglink
,
572 fd
= open(filename
, O_RDONLY
);
576 elf
= elf_begin(fd
, PERF_ELF_C_READ_MMAP
, NULL
);
578 pr_debug2("%s: cannot read %s ELF file.\n", __func__
, filename
);
586 if (gelf_getehdr(elf
, &ehdr
) == NULL
) {
587 pr_err("%s: cannot get elf header.\n", __func__
);
591 sec
= elf_section_by_name(elf
, &ehdr
, &shdr
,
592 ".gnu_debuglink", NULL
);
596 data
= elf_getdata(sec
, NULL
);
600 /* the start of this section is a zero-terminated string */
601 strncpy(debuglink
, data
->d_buf
, size
);
613 static int dso__swap_init(struct dso
*dso
, unsigned char eidata
)
615 static unsigned int const endian
= 1;
617 dso
->needs_swap
= DSO_SWAP__NO
;
621 /* We are big endian, DSO is little endian. */
622 if (*(unsigned char const *)&endian
!= 1)
623 dso
->needs_swap
= DSO_SWAP__YES
;
627 /* We are little endian, DSO is big endian. */
628 if (*(unsigned char const *)&endian
!= 0)
629 dso
->needs_swap
= DSO_SWAP__YES
;
633 pr_err("unrecognized DSO data encoding %d\n", eidata
);
640 bool symsrc__possibly_runtime(struct symsrc
*ss
)
642 return ss
->dynsym
|| ss
->opdsec
;
645 bool symsrc__has_symtab(struct symsrc
*ss
)
647 return ss
->symtab
!= NULL
;
650 void symsrc__destroy(struct symsrc
*ss
)
657 bool __weak
elf__needs_adjust_symbols(GElf_Ehdr ehdr
)
659 return ehdr
.e_type
== ET_EXEC
|| ehdr
.e_type
== ET_REL
;
662 int symsrc__init(struct symsrc
*ss
, struct dso
*dso
, const char *name
,
663 enum dso_binary_type type
)
670 if (dso__needs_decompress(dso
)) {
671 fd
= dso__decompress_kmodule_fd(dso
, name
);
675 type
= dso
->symtab_type
;
677 fd
= open(name
, O_RDONLY
);
679 dso
->load_errno
= errno
;
684 elf
= elf_begin(fd
, PERF_ELF_C_READ_MMAP
, NULL
);
686 pr_debug("%s: cannot read %s ELF file.\n", __func__
, name
);
687 dso
->load_errno
= DSO_LOAD_ERRNO__INVALID_ELF
;
691 if (gelf_getehdr(elf
, &ehdr
) == NULL
) {
692 dso
->load_errno
= DSO_LOAD_ERRNO__INVALID_ELF
;
693 pr_debug("%s: cannot get elf header.\n", __func__
);
697 if (dso__swap_init(dso
, ehdr
.e_ident
[EI_DATA
])) {
698 dso
->load_errno
= DSO_LOAD_ERRNO__INTERNAL_ERROR
;
702 /* Always reject images with a mismatched build-id: */
703 if (dso
->has_build_id
&& !symbol_conf
.ignore_vmlinux_buildid
) {
704 u8 build_id
[BUILD_ID_SIZE
];
706 if (elf_read_build_id(elf
, build_id
, BUILD_ID_SIZE
) < 0) {
707 dso
->load_errno
= DSO_LOAD_ERRNO__CANNOT_READ_BUILDID
;
711 if (!dso__build_id_equal(dso
, build_id
)) {
712 pr_debug("%s: build id mismatch for %s.\n", __func__
, name
);
713 dso
->load_errno
= DSO_LOAD_ERRNO__MISMATCHING_BUILDID
;
718 ss
->is_64_bit
= (gelf_getclass(elf
) == ELFCLASS64
);
720 ss
->symtab
= elf_section_by_name(elf
, &ehdr
, &ss
->symshdr
, ".symtab",
722 if (ss
->symshdr
.sh_type
!= SHT_SYMTAB
)
726 ss
->dynsym
= elf_section_by_name(elf
, &ehdr
, &ss
->dynshdr
, ".dynsym",
728 if (ss
->dynshdr
.sh_type
!= SHT_DYNSYM
)
732 ss
->opdsec
= elf_section_by_name(elf
, &ehdr
, &ss
->opdshdr
, ".opd",
734 if (ss
->opdshdr
.sh_type
!= SHT_PROGBITS
)
737 if (dso
->kernel
== DSO_TYPE_USER
)
738 ss
->adjust_symbols
= true;
740 ss
->adjust_symbols
= elf__needs_adjust_symbols(ehdr
);
742 ss
->name
= strdup(name
);
744 dso
->load_errno
= errno
;
763 * ref_reloc_sym_not_found - has kernel relocation symbol been found.
764 * @kmap: kernel maps and relocation reference symbol
766 * This function returns %true if we are dealing with the kernel maps and the
767 * relocation reference symbol has not yet been found. Otherwise %false is
770 static bool ref_reloc_sym_not_found(struct kmap
*kmap
)
772 return kmap
&& kmap
->ref_reloc_sym
&& kmap
->ref_reloc_sym
->name
&&
773 !kmap
->ref_reloc_sym
->unrelocated_addr
;
777 * ref_reloc - kernel relocation offset.
778 * @kmap: kernel maps and relocation reference symbol
780 * This function returns the offset of kernel addresses as determined by using
781 * the relocation reference symbol i.e. if the kernel has not been relocated
782 * then the return value is zero.
784 static u64
ref_reloc(struct kmap
*kmap
)
786 if (kmap
&& kmap
->ref_reloc_sym
&&
787 kmap
->ref_reloc_sym
->unrelocated_addr
)
788 return kmap
->ref_reloc_sym
->addr
-
789 kmap
->ref_reloc_sym
->unrelocated_addr
;
793 void __weak
arch__sym_update(struct symbol
*s __maybe_unused
,
794 GElf_Sym
*sym __maybe_unused
) { }
796 int dso__load_sym(struct dso
*dso
, struct map
*map
, struct symsrc
*syms_ss
,
797 struct symsrc
*runtime_ss
, int kmodule
)
799 struct kmap
*kmap
= dso
->kernel
? map__kmap(map
) : NULL
;
800 struct map_groups
*kmaps
= kmap
? map__kmaps(map
) : NULL
;
801 struct map
*curr_map
= map
;
802 struct dso
*curr_dso
= dso
;
803 Elf_Data
*symstrs
, *secstrs
;
810 Elf_Data
*syms
, *opddata
= NULL
;
812 Elf_Scn
*sec
, *sec_strndx
;
815 bool remap_kernel
= false, adjust_kernel_syms
= false;
820 dso
->symtab_type
= syms_ss
->type
;
821 dso
->is_64_bit
= syms_ss
->is_64_bit
;
822 dso
->rel
= syms_ss
->ehdr
.e_type
== ET_REL
;
825 * Modules may already have symbols from kallsyms, but those symbols
826 * have the wrong values for the dso maps, so remove them.
828 if (kmodule
&& syms_ss
->symtab
)
829 symbols__delete(&dso
->symbols
[map
->type
]);
831 if (!syms_ss
->symtab
) {
833 * If the vmlinux is stripped, fail so we will fall back
834 * to using kallsyms. The vmlinux runtime symbols aren't
840 syms_ss
->symtab
= syms_ss
->dynsym
;
841 syms_ss
->symshdr
= syms_ss
->dynshdr
;
845 ehdr
= syms_ss
->ehdr
;
846 sec
= syms_ss
->symtab
;
847 shdr
= syms_ss
->symshdr
;
849 if (elf_section_by_name(runtime_ss
->elf
, &runtime_ss
->ehdr
, &tshdr
,
851 dso
->text_offset
= tshdr
.sh_addr
- tshdr
.sh_offset
;
853 if (runtime_ss
->opdsec
)
854 opddata
= elf_rawdata(runtime_ss
->opdsec
, NULL
);
856 syms
= elf_getdata(sec
, NULL
);
860 sec
= elf_getscn(elf
, shdr
.sh_link
);
864 symstrs
= elf_getdata(sec
, NULL
);
868 sec_strndx
= elf_getscn(runtime_ss
->elf
, runtime_ss
->ehdr
.e_shstrndx
);
869 if (sec_strndx
== NULL
)
872 secstrs
= elf_getdata(sec_strndx
, NULL
);
876 nr_syms
= shdr
.sh_size
/ shdr
.sh_entsize
;
878 memset(&sym
, 0, sizeof(sym
));
881 * The kernel relocation symbol is needed in advance in order to adjust
882 * kernel maps correctly.
884 if (ref_reloc_sym_not_found(kmap
)) {
885 elf_symtab__for_each_symbol(syms
, nr_syms
, idx
, sym
) {
886 const char *elf_name
= elf_sym__name(&sym
, symstrs
);
888 if (strcmp(elf_name
, kmap
->ref_reloc_sym
->name
))
890 kmap
->ref_reloc_sym
->unrelocated_addr
= sym
.st_value
;
891 map
->reloc
= kmap
->ref_reloc_sym
->addr
-
892 kmap
->ref_reloc_sym
->unrelocated_addr
;
898 * Handle any relocation of vdso necessary because older kernels
899 * attempted to prelink vdso to its virtual address.
901 if (dso__is_vdso(dso
))
902 map
->reloc
= map
->start
- dso
->text_offset
;
904 dso
->adjust_symbols
= runtime_ss
->adjust_symbols
|| ref_reloc(kmap
);
906 * Initial kernel and module mappings do not map to the dso. For
907 * function mappings, flag the fixups.
909 if (map
->type
== MAP__FUNCTION
&& (dso
->kernel
|| kmodule
)) {
911 adjust_kernel_syms
= dso
->adjust_symbols
;
913 elf_symtab__for_each_symbol(syms
, nr_syms
, idx
, sym
) {
915 const char *elf_name
= elf_sym__name(&sym
, symstrs
);
916 char *demangled
= NULL
;
917 int is_label
= elf_sym__is_label(&sym
);
918 const char *section_name
;
919 bool used_opd
= false;
921 if (!is_label
&& !elf_sym__is_a(&sym
, map
->type
))
924 /* Reject ARM ELF "mapping symbols": these aren't unique and
925 * don't identify functions, so will confuse the profile
927 if (ehdr
.e_machine
== EM_ARM
|| ehdr
.e_machine
== EM_AARCH64
) {
928 if (elf_name
[0] == '$' && strchr("adtx", elf_name
[1])
929 && (elf_name
[2] == '\0' || elf_name
[2] == '.'))
933 if (runtime_ss
->opdsec
&& sym
.st_shndx
== runtime_ss
->opdidx
) {
934 u32 offset
= sym
.st_value
- syms_ss
->opdshdr
.sh_addr
;
935 u64
*opd
= opddata
->d_buf
+ offset
;
936 sym
.st_value
= DSO__SWAP(dso
, u64
, *opd
);
937 sym
.st_shndx
= elf_addr_to_index(runtime_ss
->elf
,
942 * When loading symbols in a data mapping, ABS symbols (which
943 * has a value of SHN_ABS in its st_shndx) failed at
944 * elf_getscn(). And it marks the loading as a failure so
945 * already loaded symbols cannot be fixed up.
947 * I'm not sure what should be done. Just ignore them for now.
950 if (sym
.st_shndx
== SHN_ABS
)
953 sec
= elf_getscn(runtime_ss
->elf
, sym
.st_shndx
);
957 gelf_getshdr(sec
, &shdr
);
959 if (is_label
&& !elf_sec__is_a(&shdr
, secstrs
, map
->type
))
962 section_name
= elf_sec__name(&shdr
, secstrs
);
964 /* On ARM, symbols for thumb functions have 1 added to
965 * the symbol address as a flag - remove it */
966 if ((ehdr
.e_machine
== EM_ARM
) &&
967 (map
->type
== MAP__FUNCTION
) &&
971 if (dso
->kernel
|| kmodule
) {
972 char dso_name
[PATH_MAX
];
974 /* Adjust symbol to map to file offset */
975 if (adjust_kernel_syms
)
976 sym
.st_value
-= shdr
.sh_addr
- shdr
.sh_offset
;
978 if (strcmp(section_name
,
979 (curr_dso
->short_name
+
980 dso
->short_name_len
)) == 0)
983 if (strcmp(section_name
, ".text") == 0) {
985 * The initial kernel mapping is based on
986 * kallsyms and identity maps. Overwrite it to
987 * map to the kernel dso.
989 if (remap_kernel
&& dso
->kernel
) {
990 remap_kernel
= false;
991 map
->start
= shdr
.sh_addr
+
993 map
->end
= map
->start
+ shdr
.sh_size
;
994 map
->pgoff
= shdr
.sh_offset
;
995 map
->map_ip
= map__map_ip
;
996 map
->unmap_ip
= map__unmap_ip
;
997 /* Ensure maps are correctly ordered */
1000 map_groups__remove(kmaps
, map
);
1001 map_groups__insert(kmaps
, map
);
1007 * The initial module mapping is based on
1008 * /proc/modules mapped to offset zero.
1009 * Overwrite it to map to the module dso.
1011 if (remap_kernel
&& kmodule
) {
1012 remap_kernel
= false;
1013 map
->pgoff
= shdr
.sh_offset
;
1024 snprintf(dso_name
, sizeof(dso_name
),
1025 "%s%s", dso
->short_name
, section_name
);
1027 curr_map
= map_groups__find_by_name(kmaps
, map
->type
, dso_name
);
1028 if (curr_map
== NULL
) {
1029 u64 start
= sym
.st_value
;
1032 start
+= map
->start
+ shdr
.sh_offset
;
1034 curr_dso
= dso__new(dso_name
);
1035 if (curr_dso
== NULL
)
1037 curr_dso
->kernel
= dso
->kernel
;
1038 curr_dso
->long_name
= dso
->long_name
;
1039 curr_dso
->long_name_len
= dso
->long_name_len
;
1040 curr_map
= map__new2(start
, curr_dso
,
1043 if (curr_map
== NULL
) {
1046 if (adjust_kernel_syms
) {
1047 curr_map
->start
= shdr
.sh_addr
+
1049 curr_map
->end
= curr_map
->start
+
1051 curr_map
->pgoff
= shdr
.sh_offset
;
1053 curr_map
->map_ip
= identity__map_ip
;
1054 curr_map
->unmap_ip
= identity__map_ip
;
1056 curr_dso
->symtab_type
= dso
->symtab_type
;
1057 map_groups__insert(kmaps
, curr_map
);
1059 * Add it before we drop the referece to curr_map,
1060 * i.e. while we still are sure to have a reference
1061 * to this DSO via curr_map->dso.
1063 dsos__add(&map
->groups
->machine
->dsos
, curr_dso
);
1064 /* kmaps already got it */
1066 dso__set_loaded(curr_dso
, map
->type
);
1068 curr_dso
= curr_map
->dso
;
1073 if ((used_opd
&& runtime_ss
->adjust_symbols
)
1074 || (!used_opd
&& syms_ss
->adjust_symbols
)) {
1075 pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64
" "
1076 "sh_addr: %#" PRIx64
" sh_offset: %#" PRIx64
"\n", __func__
,
1077 (u64
)sym
.st_value
, (u64
)shdr
.sh_addr
,
1078 (u64
)shdr
.sh_offset
);
1079 sym
.st_value
-= shdr
.sh_addr
- shdr
.sh_offset
;
1082 demangled
= demangle_sym(dso
, kmodule
, elf_name
);
1083 if (demangled
!= NULL
)
1084 elf_name
= demangled
;
1086 f
= symbol__new(sym
.st_value
, sym
.st_size
,
1087 GELF_ST_BIND(sym
.st_info
), elf_name
);
1092 arch__sym_update(f
, &sym
);
1094 __symbols__insert(&curr_dso
->symbols
[curr_map
->type
], f
, dso
->kernel
);
1099 * For misannotated, zeroed, ASM function sizes.
1102 symbols__fixup_end(&dso
->symbols
[map
->type
]);
1103 symbols__fixup_duplicate(&dso
->symbols
[map
->type
]);
1106 * We need to fixup this here too because we create new
1107 * maps here, for things like vsyscall sections.
1109 __map_groups__fixup_end(kmaps
, map
->type
);
1117 static int elf_read_maps(Elf
*elf
, bool exe
, mapfn_t mapfn
, void *data
)
1124 if (elf_getphdrnum(elf
, &phdrnum
))
1127 for (i
= 0; i
< phdrnum
; i
++) {
1128 if (gelf_getphdr(elf
, i
, &phdr
) == NULL
)
1130 if (phdr
.p_type
!= PT_LOAD
)
1133 if (!(phdr
.p_flags
& PF_X
))
1136 if (!(phdr
.p_flags
& PF_R
))
1139 sz
= min(phdr
.p_memsz
, phdr
.p_filesz
);
1142 err
= mapfn(phdr
.p_vaddr
, sz
, phdr
.p_offset
, data
);
1149 int file__read_maps(int fd
, bool exe
, mapfn_t mapfn
, void *data
,
1155 elf
= elf_begin(fd
, PERF_ELF_C_READ_MMAP
, NULL
);
1160 *is_64_bit
= (gelf_getclass(elf
) == ELFCLASS64
);
1162 err
= elf_read_maps(elf
, exe
, mapfn
, data
);
1168 enum dso_type
dso__type_fd(int fd
)
1170 enum dso_type dso_type
= DSO__TYPE_UNKNOWN
;
1175 elf
= elf_begin(fd
, PERF_ELF_C_READ_MMAP
, NULL
);
1180 if (ek
!= ELF_K_ELF
)
1183 if (gelf_getclass(elf
) == ELFCLASS64
) {
1184 dso_type
= DSO__TYPE_64BIT
;
1188 if (gelf_getehdr(elf
, &ehdr
) == NULL
)
1191 if (ehdr
.e_machine
== EM_X86_64
)
1192 dso_type
= DSO__TYPE_X32BIT
;
1194 dso_type
= DSO__TYPE_32BIT
;
1201 static int copy_bytes(int from
, off_t from_offs
, int to
, off_t to_offs
, u64 len
)
1206 char *buf
= malloc(page_size
);
1211 if (lseek(to
, to_offs
, SEEK_SET
) != to_offs
)
1214 if (lseek(from
, from_offs
, SEEK_SET
) != from_offs
)
1221 /* Use read because mmap won't work on proc files */
1222 r
= read(from
, buf
, n
);
1228 r
= write(to
, buf
, n
);
1249 static int kcore__open(struct kcore
*kcore
, const char *filename
)
1253 kcore
->fd
= open(filename
, O_RDONLY
);
1254 if (kcore
->fd
== -1)
1257 kcore
->elf
= elf_begin(kcore
->fd
, ELF_C_READ
, NULL
);
1261 kcore
->elfclass
= gelf_getclass(kcore
->elf
);
1262 if (kcore
->elfclass
== ELFCLASSNONE
)
1265 ehdr
= gelf_getehdr(kcore
->elf
, &kcore
->ehdr
);
1272 elf_end(kcore
->elf
);
1278 static int kcore__init(struct kcore
*kcore
, char *filename
, int elfclass
,
1281 kcore
->elfclass
= elfclass
;
1284 kcore
->fd
= mkstemp(filename
);
1286 kcore
->fd
= open(filename
, O_WRONLY
| O_CREAT
| O_EXCL
, 0400);
1287 if (kcore
->fd
== -1)
1290 kcore
->elf
= elf_begin(kcore
->fd
, ELF_C_WRITE
, NULL
);
1294 if (!gelf_newehdr(kcore
->elf
, elfclass
))
1297 memset(&kcore
->ehdr
, 0, sizeof(GElf_Ehdr
));
1302 elf_end(kcore
->elf
);
1309 static void kcore__close(struct kcore
*kcore
)
1311 elf_end(kcore
->elf
);
1315 static int kcore__copy_hdr(struct kcore
*from
, struct kcore
*to
, size_t count
)
1317 GElf_Ehdr
*ehdr
= &to
->ehdr
;
1318 GElf_Ehdr
*kehdr
= &from
->ehdr
;
1320 memcpy(ehdr
->e_ident
, kehdr
->e_ident
, EI_NIDENT
);
1321 ehdr
->e_type
= kehdr
->e_type
;
1322 ehdr
->e_machine
= kehdr
->e_machine
;
1323 ehdr
->e_version
= kehdr
->e_version
;
1326 ehdr
->e_flags
= kehdr
->e_flags
;
1327 ehdr
->e_phnum
= count
;
1328 ehdr
->e_shentsize
= 0;
1330 ehdr
->e_shstrndx
= 0;
1332 if (from
->elfclass
== ELFCLASS32
) {
1333 ehdr
->e_phoff
= sizeof(Elf32_Ehdr
);
1334 ehdr
->e_ehsize
= sizeof(Elf32_Ehdr
);
1335 ehdr
->e_phentsize
= sizeof(Elf32_Phdr
);
1337 ehdr
->e_phoff
= sizeof(Elf64_Ehdr
);
1338 ehdr
->e_ehsize
= sizeof(Elf64_Ehdr
);
1339 ehdr
->e_phentsize
= sizeof(Elf64_Phdr
);
1342 if (!gelf_update_ehdr(to
->elf
, ehdr
))
1345 if (!gelf_newphdr(to
->elf
, count
))
1351 static int kcore__add_phdr(struct kcore
*kcore
, int idx
, off_t offset
,
1356 .p_flags
= PF_R
| PF_W
| PF_X
,
1362 .p_align
= page_size
,
1365 if (!gelf_update_phdr(kcore
->elf
, idx
, &phdr
))
1371 static off_t
kcore__write(struct kcore
*kcore
)
1373 return elf_update(kcore
->elf
, ELF_C_WRITE
);
1382 struct kcore_copy_info
{
1388 u64 last_module_symbol
;
1389 struct phdr_data kernel_map
;
1390 struct phdr_data modules_map
;
1393 static int kcore_copy__process_kallsyms(void *arg
, const char *name
, char type
,
1396 struct kcore_copy_info
*kci
= arg
;
1398 if (!symbol_type__is_a(type
, MAP__FUNCTION
))
1401 if (strchr(name
, '[')) {
1402 if (start
> kci
->last_module_symbol
)
1403 kci
->last_module_symbol
= start
;
1407 if (!kci
->first_symbol
|| start
< kci
->first_symbol
)
1408 kci
->first_symbol
= start
;
1410 if (!kci
->last_symbol
|| start
> kci
->last_symbol
)
1411 kci
->last_symbol
= start
;
1413 if (!strcmp(name
, "_stext")) {
1418 if (!strcmp(name
, "_etext")) {
1426 static int kcore_copy__parse_kallsyms(struct kcore_copy_info
*kci
,
1429 char kallsyms_filename
[PATH_MAX
];
1431 scnprintf(kallsyms_filename
, PATH_MAX
, "%s/kallsyms", dir
);
1433 if (symbol__restricted_filename(kallsyms_filename
, "/proc/kallsyms"))
1436 if (kallsyms__parse(kallsyms_filename
, kci
,
1437 kcore_copy__process_kallsyms
) < 0)
1443 static int kcore_copy__process_modules(void *arg
,
1444 const char *name __maybe_unused
,
1447 struct kcore_copy_info
*kci
= arg
;
1449 if (!kci
->first_module
|| start
< kci
->first_module
)
1450 kci
->first_module
= start
;
1455 static int kcore_copy__parse_modules(struct kcore_copy_info
*kci
,
1458 char modules_filename
[PATH_MAX
];
1460 scnprintf(modules_filename
, PATH_MAX
, "%s/modules", dir
);
1462 if (symbol__restricted_filename(modules_filename
, "/proc/modules"))
1465 if (modules__parse(modules_filename
, kci
,
1466 kcore_copy__process_modules
) < 0)
1472 static void kcore_copy__map(struct phdr_data
*p
, u64 start
, u64 end
, u64 pgoff
,
1475 if (p
->addr
|| s
< start
|| s
>= end
)
1479 p
->offset
= (s
- start
) + pgoff
;
1480 p
->len
= e
< end
? e
- s
: end
- s
;
1483 static int kcore_copy__read_map(u64 start
, u64 len
, u64 pgoff
, void *data
)
1485 struct kcore_copy_info
*kci
= data
;
1486 u64 end
= start
+ len
;
1488 kcore_copy__map(&kci
->kernel_map
, start
, end
, pgoff
, kci
->stext
,
1491 kcore_copy__map(&kci
->modules_map
, start
, end
, pgoff
, kci
->first_module
,
1492 kci
->last_module_symbol
);
1497 static int kcore_copy__read_maps(struct kcore_copy_info
*kci
, Elf
*elf
)
1499 if (elf_read_maps(elf
, true, kcore_copy__read_map
, kci
) < 0)
1505 static int kcore_copy__calc_maps(struct kcore_copy_info
*kci
, const char *dir
,
1508 if (kcore_copy__parse_kallsyms(kci
, dir
))
1511 if (kcore_copy__parse_modules(kci
, dir
))
1515 kci
->stext
= round_down(kci
->stext
, page_size
);
1517 kci
->stext
= round_down(kci
->first_symbol
, page_size
);
1520 kci
->etext
= round_up(kci
->etext
, page_size
);
1521 } else if (kci
->last_symbol
) {
1522 kci
->etext
= round_up(kci
->last_symbol
, page_size
);
1523 kci
->etext
+= page_size
;
1526 kci
->first_module
= round_down(kci
->first_module
, page_size
);
1528 if (kci
->last_module_symbol
) {
1529 kci
->last_module_symbol
= round_up(kci
->last_module_symbol
,
1531 kci
->last_module_symbol
+= page_size
;
1534 if (!kci
->stext
|| !kci
->etext
)
1537 if (kci
->first_module
&& !kci
->last_module_symbol
)
1540 return kcore_copy__read_maps(kci
, elf
);
1543 static int kcore_copy__copy_file(const char *from_dir
, const char *to_dir
,
1546 char from_filename
[PATH_MAX
];
1547 char to_filename
[PATH_MAX
];
1549 scnprintf(from_filename
, PATH_MAX
, "%s/%s", from_dir
, name
);
1550 scnprintf(to_filename
, PATH_MAX
, "%s/%s", to_dir
, name
);
1552 return copyfile_mode(from_filename
, to_filename
, 0400);
1555 static int kcore_copy__unlink(const char *dir
, const char *name
)
1557 char filename
[PATH_MAX
];
1559 scnprintf(filename
, PATH_MAX
, "%s/%s", dir
, name
);
1561 return unlink(filename
);
1564 static int kcore_copy__compare_fds(int from
, int to
)
1572 buf_from
= malloc(page_size
);
1573 buf_to
= malloc(page_size
);
1574 if (!buf_from
|| !buf_to
)
1578 /* Use read because mmap won't work on proc files */
1579 ret
= read(from
, buf_from
, page_size
);
1588 if (readn(to
, buf_to
, len
) != (int)len
)
1591 if (memcmp(buf_from
, buf_to
, len
))
1602 static int kcore_copy__compare_files(const char *from_filename
,
1603 const char *to_filename
)
1605 int from
, to
, err
= -1;
1607 from
= open(from_filename
, O_RDONLY
);
1611 to
= open(to_filename
, O_RDONLY
);
1613 goto out_close_from
;
1615 err
= kcore_copy__compare_fds(from
, to
);
1623 static int kcore_copy__compare_file(const char *from_dir
, const char *to_dir
,
1626 char from_filename
[PATH_MAX
];
1627 char to_filename
[PATH_MAX
];
1629 scnprintf(from_filename
, PATH_MAX
, "%s/%s", from_dir
, name
);
1630 scnprintf(to_filename
, PATH_MAX
, "%s/%s", to_dir
, name
);
1632 return kcore_copy__compare_files(from_filename
, to_filename
);
1636 * kcore_copy - copy kallsyms, modules and kcore from one directory to another.
1637 * @from_dir: from directory
1638 * @to_dir: to directory
1640 * This function copies kallsyms, modules and kcore files from one directory to
1641 * another. kallsyms and modules are copied entirely. Only code segments are
1642 * copied from kcore. It is assumed that two segments suffice: one for the
1643 * kernel proper and one for all the modules. The code segments are determined
1644 * from kallsyms and modules files. The kernel map starts at _stext or the
1645 * lowest function symbol, and ends at _etext or the highest function symbol.
1646 * The module map starts at the lowest module address and ends at the highest
1647 * module symbol. Start addresses are rounded down to the nearest page. End
1648 * addresses are rounded up to the nearest page. An extra page is added to the
1649 * highest kernel symbol and highest module symbol to, hopefully, encompass that
1650 * symbol too. Because it contains only code sections, the resulting kcore is
1651 * unusual. One significant peculiarity is that the mapping (start -> pgoff)
1652 * is not the same for the kernel map and the modules map. That happens because
1653 * the data is copied adjacently whereas the original kcore has gaps. Finally,
1654 * kallsyms and modules files are compared with their copies to check that
1655 * modules have not been loaded or unloaded while the copies were taking place.
1657 * Return: %0 on success, %-1 on failure.
1659 int kcore_copy(const char *from_dir
, const char *to_dir
)
1662 struct kcore extract
;
1664 int idx
= 0, err
= -1;
1665 off_t offset
= page_size
, sz
, modules_offset
= 0;
1666 struct kcore_copy_info kci
= { .stext
= 0, };
1667 char kcore_filename
[PATH_MAX
];
1668 char extract_filename
[PATH_MAX
];
1670 if (kcore_copy__copy_file(from_dir
, to_dir
, "kallsyms"))
1673 if (kcore_copy__copy_file(from_dir
, to_dir
, "modules"))
1674 goto out_unlink_kallsyms
;
1676 scnprintf(kcore_filename
, PATH_MAX
, "%s/kcore", from_dir
);
1677 scnprintf(extract_filename
, PATH_MAX
, "%s/kcore", to_dir
);
1679 if (kcore__open(&kcore
, kcore_filename
))
1680 goto out_unlink_modules
;
1682 if (kcore_copy__calc_maps(&kci
, from_dir
, kcore
.elf
))
1683 goto out_kcore_close
;
1685 if (kcore__init(&extract
, extract_filename
, kcore
.elfclass
, false))
1686 goto out_kcore_close
;
1688 if (!kci
.modules_map
.addr
)
1691 if (kcore__copy_hdr(&kcore
, &extract
, count
))
1692 goto out_extract_close
;
1694 if (kcore__add_phdr(&extract
, idx
++, offset
, kci
.kernel_map
.addr
,
1695 kci
.kernel_map
.len
))
1696 goto out_extract_close
;
1698 if (kci
.modules_map
.addr
) {
1699 modules_offset
= offset
+ kci
.kernel_map
.len
;
1700 if (kcore__add_phdr(&extract
, idx
, modules_offset
,
1701 kci
.modules_map
.addr
, kci
.modules_map
.len
))
1702 goto out_extract_close
;
1705 sz
= kcore__write(&extract
);
1706 if (sz
< 0 || sz
> offset
)
1707 goto out_extract_close
;
1709 if (copy_bytes(kcore
.fd
, kci
.kernel_map
.offset
, extract
.fd
, offset
,
1710 kci
.kernel_map
.len
))
1711 goto out_extract_close
;
1713 if (modules_offset
&& copy_bytes(kcore
.fd
, kci
.modules_map
.offset
,
1714 extract
.fd
, modules_offset
,
1715 kci
.modules_map
.len
))
1716 goto out_extract_close
;
1718 if (kcore_copy__compare_file(from_dir
, to_dir
, "modules"))
1719 goto out_extract_close
;
1721 if (kcore_copy__compare_file(from_dir
, to_dir
, "kallsyms"))
1722 goto out_extract_close
;
1727 kcore__close(&extract
);
1729 unlink(extract_filename
);
1731 kcore__close(&kcore
);
1734 kcore_copy__unlink(to_dir
, "modules");
1735 out_unlink_kallsyms
:
1737 kcore_copy__unlink(to_dir
, "kallsyms");
1742 int kcore_extract__create(struct kcore_extract
*kce
)
1745 struct kcore extract
;
1747 int idx
= 0, err
= -1;
1748 off_t offset
= page_size
, sz
;
1750 if (kcore__open(&kcore
, kce
->kcore_filename
))
1753 strcpy(kce
->extract_filename
, PERF_KCORE_EXTRACT
);
1754 if (kcore__init(&extract
, kce
->extract_filename
, kcore
.elfclass
, true))
1755 goto out_kcore_close
;
1757 if (kcore__copy_hdr(&kcore
, &extract
, count
))
1758 goto out_extract_close
;
1760 if (kcore__add_phdr(&extract
, idx
, offset
, kce
->addr
, kce
->len
))
1761 goto out_extract_close
;
1763 sz
= kcore__write(&extract
);
1764 if (sz
< 0 || sz
> offset
)
1765 goto out_extract_close
;
1767 if (copy_bytes(kcore
.fd
, kce
->offs
, extract
.fd
, offset
, kce
->len
))
1768 goto out_extract_close
;
1773 kcore__close(&extract
);
1775 unlink(kce
->extract_filename
);
1777 kcore__close(&kcore
);
1782 void kcore_extract__delete(struct kcore_extract
*kce
)
1784 unlink(kce
->extract_filename
);
1787 #ifdef HAVE_GELF_GETNOTE_SUPPORT
1789 * populate_sdt_note : Parse raw data and identify SDT note
1790 * @elf: elf of the opened file
1791 * @data: raw data of a section with description offset applied
1792 * @len: note description size
1793 * @type: type of the note
1794 * @sdt_notes: List to add the SDT note
1796 * Responsible for parsing the @data in section .note.stapsdt in @elf and
1797 * if its an SDT note, it appends to @sdt_notes list.
1799 static int populate_sdt_note(Elf
**elf
, const char *data
, size_t len
,
1800 struct list_head
*sdt_notes
)
1802 const char *provider
, *name
, *args
;
1803 struct sdt_note
*tmp
= NULL
;
1805 GElf_Addr base_off
= 0;
1810 Elf64_Addr a64
[NR_ADDR
];
1811 Elf32_Addr a32
[NR_ADDR
];
1815 .d_buf
= &buf
, .d_type
= ELF_T_ADDR
, .d_version
= EV_CURRENT
,
1816 .d_size
= gelf_fsize((*elf
), ELF_T_ADDR
, NR_ADDR
, EV_CURRENT
),
1817 .d_off
= 0, .d_align
= 0
1820 .d_buf
= (void *) data
, .d_type
= ELF_T_ADDR
,
1821 .d_version
= EV_CURRENT
, .d_size
= dst
.d_size
, .d_off
= 0,
1825 tmp
= (struct sdt_note
*)calloc(1, sizeof(struct sdt_note
));
1831 INIT_LIST_HEAD(&tmp
->note_list
);
1833 if (len
< dst
.d_size
+ 3)
1836 /* Translation from file representation to memory representation */
1837 if (gelf_xlatetom(*elf
, &dst
, &src
,
1838 elf_getident(*elf
, NULL
)[EI_DATA
]) == NULL
) {
1839 pr_err("gelf_xlatetom : %s\n", elf_errmsg(-1));
1843 /* Populate the fields of sdt_note */
1844 provider
= data
+ dst
.d_size
;
1846 name
= (const char *)memchr(provider
, '\0', data
+ len
- provider
);
1850 tmp
->provider
= strdup(provider
);
1851 if (!tmp
->provider
) {
1855 tmp
->name
= strdup(name
);
1861 args
= memchr(name
, '\0', data
+ len
- name
);
1864 * There is no argument if:
1865 * - We reached the end of the note;
1866 * - There is not enough room to hold a potential string;
1867 * - The argument string is empty or just contains ':'.
1869 if (args
== NULL
|| data
+ len
- args
< 2 ||
1870 args
[1] == ':' || args
[1] == '\0')
1873 tmp
->args
= strdup(++args
);
1880 if (gelf_getclass(*elf
) == ELFCLASS32
) {
1881 memcpy(&tmp
->addr
, &buf
, 3 * sizeof(Elf32_Addr
));
1884 memcpy(&tmp
->addr
, &buf
, 3 * sizeof(Elf64_Addr
));
1888 if (!gelf_getehdr(*elf
, &ehdr
)) {
1889 pr_debug("%s : cannot get elf header.\n", __func__
);
1894 /* Adjust the prelink effect :
1895 * Find out the .stapsdt.base section.
1896 * This scn will help us to handle prelinking (if present).
1897 * Compare the retrieved file offset of the base section with the
1898 * base address in the description of the SDT note. If its different,
1899 * then accordingly, adjust the note location.
1901 if (elf_section_by_name(*elf
, &ehdr
, &shdr
, SDT_BASE_SCN
, NULL
)) {
1902 base_off
= shdr
.sh_offset
;
1905 tmp
->addr
.a32
[0] = tmp
->addr
.a32
[0] + base_off
-
1908 tmp
->addr
.a64
[0] = tmp
->addr
.a64
[0] + base_off
-
1913 list_add_tail(&tmp
->note_list
, sdt_notes
);
1921 free(tmp
->provider
);
1929 * construct_sdt_notes_list : constructs a list of SDT notes
1930 * @elf : elf to look into
1931 * @sdt_notes : empty list_head
1933 * Scans the sections in 'elf' for the section
1934 * .note.stapsdt. It, then calls populate_sdt_note to find
1935 * out the SDT events and populates the 'sdt_notes'.
1937 static int construct_sdt_notes_list(Elf
*elf
, struct list_head
*sdt_notes
)
1940 Elf_Scn
*scn
= NULL
;
1943 size_t shstrndx
, next
;
1945 size_t name_off
, desc_off
, offset
;
1948 if (gelf_getehdr(elf
, &ehdr
) == NULL
) {
1952 if (elf_getshdrstrndx(elf
, &shstrndx
) != 0) {
1957 /* Look for the required section */
1958 scn
= elf_section_by_name(elf
, &ehdr
, &shdr
, SDT_NOTE_SCN
, NULL
);
1964 if ((shdr
.sh_type
!= SHT_NOTE
) || (shdr
.sh_flags
& SHF_ALLOC
)) {
1969 data
= elf_getdata(scn
, NULL
);
1971 /* Get the SDT notes */
1972 for (offset
= 0; (next
= gelf_getnote(data
, offset
, &nhdr
, &name_off
,
1973 &desc_off
)) > 0; offset
= next
) {
1974 if (nhdr
.n_namesz
== sizeof(SDT_NOTE_NAME
) &&
1975 !memcmp(data
->d_buf
+ name_off
, SDT_NOTE_NAME
,
1976 sizeof(SDT_NOTE_NAME
))) {
1977 /* Check the type of the note */
1978 if (nhdr
.n_type
!= SDT_NOTE_TYPE
)
1981 ret
= populate_sdt_note(&elf
, ((data
->d_buf
) + desc_off
),
1982 nhdr
.n_descsz
, sdt_notes
);
1987 if (list_empty(sdt_notes
))
1995 * get_sdt_note_list : Wrapper to construct a list of sdt notes
1996 * @head : empty list_head
1997 * @target : file to find SDT notes from
1999 * This opens the file, initializes
2000 * the ELF and then calls construct_sdt_notes_list.
2002 int get_sdt_note_list(struct list_head
*head
, const char *target
)
2007 fd
= open(target
, O_RDONLY
);
2011 elf
= elf_begin(fd
, PERF_ELF_C_READ_MMAP
, NULL
);
2016 ret
= construct_sdt_notes_list(elf
, head
);
2024 * cleanup_sdt_note_list : free the sdt notes' list
2025 * @sdt_notes: sdt notes' list
2027 * Free up the SDT notes in @sdt_notes.
2028 * Returns the number of SDT notes free'd.
2030 int cleanup_sdt_note_list(struct list_head
*sdt_notes
)
2032 struct sdt_note
*tmp
, *pos
;
2035 list_for_each_entry_safe(pos
, tmp
, sdt_notes
, note_list
) {
2036 list_del(&pos
->note_list
);
2038 free(pos
->provider
);
2046 * sdt_notes__get_count: Counts the number of sdt events
2047 * @start: list_head to sdt_notes list
2049 * Returns the number of SDT notes in a list
2051 int sdt_notes__get_count(struct list_head
*start
)
2053 struct sdt_note
*sdt_ptr
;
2056 list_for_each_entry(sdt_ptr
, start
, note_list
)
2062 void symbol__elf_init(void)
2064 elf_version(EV_CURRENT
);