9 #include "demangle-java.h"
10 #include "demangle-rust.h"
13 #include <symbol/kallsyms.h>
17 #define EM_AARCH64 183 /* ARM 64 bit */
20 typedef Elf64_Nhdr GElf_Nhdr;
22 #ifdef HAVE_CPLUS_DEMANGLE_SUPPORT
23 extern char *cplus_demangle(const char *, int);
25 static inline char *bfd_demangle(void __maybe_unused *v, const char *c, int i)
27 return cplus_demangle(c, i);
31 static inline char *bfd_demangle(void __maybe_unused *v,
32 const char __maybe_unused *c,
38 #define PACKAGE 'perf'
43 #ifndef HAVE_ELF_GETPHDRNUM_SUPPORT
44 static int elf_getphdrnum(Elf *elf, size_t *dst)
49 ehdr = gelf_getehdr(elf, &gehdr);
59 #ifndef HAVE_ELF_GETSHDRSTRNDX_SUPPORT
60 static int elf_getshdrstrndx(Elf *elf __maybe_unused, size_t *dst __maybe_unused)
62 pr_err("%s: update your libelf to > 0.140, this one lacks elf_getshdrstrndx().\n", __func__);
67 #ifndef NT_GNU_BUILD_ID
68 #define NT_GNU_BUILD_ID 3
72 * elf_symtab__for_each_symbol - iterate thru all the symbols
74 * @syms: struct elf_symtab instance to iterate
76 * @sym: GElf_Sym iterator
78 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
79 for (idx = 0, gelf_getsym(syms, idx, &sym);\
81 idx++, gelf_getsym(syms, idx, &sym))
83 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
85 return GELF_ST_TYPE(sym->st_info);
88 static inline uint8_t elf_sym__visibility(const GElf_Sym *sym)
90 return GELF_ST_VISIBILITY(sym->st_other);
94 #define STT_GNU_IFUNC 10
97 static inline int elf_sym__is_function(const GElf_Sym *sym)
99 return (elf_sym__type(sym) == STT_FUNC ||
100 elf_sym__type(sym) == STT_GNU_IFUNC) &&
102 sym->st_shndx != SHN_UNDEF;
105 static inline bool elf_sym__is_object(const GElf_Sym *sym)
107 return elf_sym__type(sym) == STT_OBJECT &&
109 sym->st_shndx != SHN_UNDEF;
112 static inline int elf_sym__is_label(const GElf_Sym *sym)
114 return elf_sym__type(sym) == STT_NOTYPE &&
116 sym->st_shndx != SHN_UNDEF &&
117 sym->st_shndx != SHN_ABS &&
118 elf_sym__visibility(sym) != STV_HIDDEN &&
119 elf_sym__visibility(sym) != STV_INTERNAL;
122 static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type)
126 return elf_sym__is_function(sym);
128 return elf_sym__is_object(sym);
134 static inline const char *elf_sym__name(const GElf_Sym *sym,
135 const Elf_Data *symstrs)
137 return symstrs->d_buf + sym->st_name;
140 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
141 const Elf_Data *secstrs)
143 return secstrs->d_buf + shdr->sh_name;
146 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
147 const Elf_Data *secstrs)
149 return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
152 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
153 const Elf_Data *secstrs)
155 return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
158 static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs,
163 return elf_sec__is_text(shdr, secstrs);
165 return elf_sec__is_data(shdr, secstrs);
171 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
177 while ((sec = elf_nextscn(elf, sec)) != NULL) {
178 gelf_getshdr(sec, &shdr);
180 if ((addr >= shdr.sh_addr) &&
181 (addr < (shdr.sh_addr + shdr.sh_size)))
190 Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
191 GElf_Shdr *shp, const char *name, size_t *idx)
196 /* Elf is corrupted/truncated, avoid calling elf_strptr. */
197 if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL))
200 while ((sec = elf_nextscn(elf, sec)) != NULL) {
203 gelf_getshdr(sec, shp);
204 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
205 if (str && !strcmp(name, str)) {
216 static bool want_demangle(bool is_kernel_sym)
218 return is_kernel_sym ? symbol_conf.demangle_kernel : symbol_conf.demangle;
221 static char *demangle_sym(struct dso *dso, int kmodule, const char *elf_name)
223 int demangle_flags = verbose ? (DMGL_PARAMS | DMGL_ANSI) : DMGL_NO_OPTS;
224 char *demangled = NULL;
227 * We need to figure out if the object was created from C++ sources
228 * DWARF DW_compile_unit has this, but we don't always have access
231 if (!want_demangle(dso->kernel || kmodule))
234 demangled = bfd_demangle(NULL, elf_name, demangle_flags);
235 if (demangled == NULL)
236 demangled = java_demangle_sym(elf_name, JAVA_DEMANGLE_NORET);
237 else if (rust_is_mangled(demangled))
239 * Input to Rust demangling is the BFD-demangled
240 * name which it Rust-demangles in place.
242 rust_demangle_sym(demangled);
247 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
248 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
250 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
252 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
253 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
255 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
258 * We need to check if we have a .dynsym, so that we can handle the
259 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
260 * .dynsym or .symtab).
261 * And always look at the original dso, not at debuginfo packages, that
262 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
264 int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map *map)
266 uint32_t nr_rel_entries, idx;
271 GElf_Shdr shdr_rel_plt, shdr_dynsym;
272 Elf_Data *reldata, *syms, *symstrs;
273 Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
276 char sympltname[1024];
278 int nr = 0, symidx, err = 0;
286 scn_dynsym = ss->dynsym;
287 shdr_dynsym = ss->dynshdr;
288 dynsym_idx = ss->dynsym_idx;
290 if (scn_dynsym == NULL)
293 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
295 if (scn_plt_rel == NULL) {
296 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
298 if (scn_plt_rel == NULL)
304 if (shdr_rel_plt.sh_link != dynsym_idx)
307 if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
311 * Fetch the relocation section to find the idxes to the GOT
312 * and the symbols in the .dynsym they refer to.
314 reldata = elf_getdata(scn_plt_rel, NULL);
318 syms = elf_getdata(scn_dynsym, NULL);
322 scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
323 if (scn_symstrs == NULL)
326 symstrs = elf_getdata(scn_symstrs, NULL);
330 if (symstrs->d_size == 0)
333 nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
334 plt_offset = shdr_plt.sh_offset;
336 if (shdr_rel_plt.sh_type == SHT_RELA) {
337 GElf_Rela pos_mem, *pos;
339 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
341 const char *elf_name = NULL;
342 char *demangled = NULL;
343 symidx = GELF_R_SYM(pos->r_info);
344 plt_offset += shdr_plt.sh_entsize;
345 gelf_getsym(syms, symidx, &sym);
347 elf_name = elf_sym__name(&sym, symstrs);
348 demangled = demangle_sym(dso, 0, elf_name);
349 if (demangled != NULL)
350 elf_name = demangled;
351 snprintf(sympltname, sizeof(sympltname),
355 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
356 STB_GLOBAL, sympltname);
360 symbols__insert(&dso->symbols[map->type], f);
363 } else if (shdr_rel_plt.sh_type == SHT_REL) {
364 GElf_Rel pos_mem, *pos;
365 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
367 const char *elf_name = NULL;
368 char *demangled = NULL;
369 symidx = GELF_R_SYM(pos->r_info);
370 plt_offset += shdr_plt.sh_entsize;
371 gelf_getsym(syms, symidx, &sym);
373 elf_name = elf_sym__name(&sym, symstrs);
374 demangled = demangle_sym(dso, 0, elf_name);
375 if (demangled != NULL)
376 elf_name = demangled;
377 snprintf(sympltname, sizeof(sympltname),
381 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
382 STB_GLOBAL, sympltname);
386 symbols__insert(&dso->symbols[map->type], f);
395 pr_debug("%s: problems reading %s PLT info.\n",
396 __func__, dso->long_name);
401 * Align offset to 4 bytes as needed for note name and descriptor data.
403 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
405 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
415 if (size < BUILD_ID_SIZE)
422 if (gelf_getehdr(elf, &ehdr) == NULL) {
423 pr_err("%s: cannot get elf header.\n", __func__);
428 * Check following sections for notes:
429 * '.note.gnu.build-id'
431 * '.note' (VDSO specific)
434 sec = elf_section_by_name(elf, &ehdr, &shdr,
435 ".note.gnu.build-id", NULL);
439 sec = elf_section_by_name(elf, &ehdr, &shdr,
444 sec = elf_section_by_name(elf, &ehdr, &shdr,
453 data = elf_getdata(sec, NULL);
458 while (ptr < (data->d_buf + data->d_size)) {
459 GElf_Nhdr *nhdr = ptr;
460 size_t namesz = NOTE_ALIGN(nhdr->n_namesz),
461 descsz = NOTE_ALIGN(nhdr->n_descsz);
464 ptr += sizeof(*nhdr);
467 if (nhdr->n_type == NT_GNU_BUILD_ID &&
468 nhdr->n_namesz == sizeof("GNU")) {
469 if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
470 size_t sz = min(size, descsz);
472 memset(bf + sz, 0, size - sz);
484 int filename__read_build_id(const char *filename, void *bf, size_t size)
489 if (size < BUILD_ID_SIZE)
492 fd = open(filename, O_RDONLY);
496 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
498 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
502 err = elf_read_build_id(elf, bf, size);
511 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
515 if (size < BUILD_ID_SIZE)
518 fd = open(filename, O_RDONLY);
525 size_t namesz, descsz;
527 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
530 namesz = NOTE_ALIGN(nhdr.n_namesz);
531 descsz = NOTE_ALIGN(nhdr.n_descsz);
532 if (nhdr.n_type == NT_GNU_BUILD_ID &&
533 nhdr.n_namesz == sizeof("GNU")) {
534 if (read(fd, bf, namesz) != (ssize_t)namesz)
536 if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
537 size_t sz = min(descsz, size);
538 if (read(fd, build_id, sz) == (ssize_t)sz) {
539 memset(build_id + sz, 0, size - sz);
543 } else if (read(fd, bf, descsz) != (ssize_t)descsz)
546 int n = namesz + descsz;
548 if (n > (int)sizeof(bf)) {
550 pr_debug("%s: truncating reading of build id in sysfs file %s: n_namesz=%u, n_descsz=%u.\n",
551 __func__, filename, nhdr.n_namesz, nhdr.n_descsz);
553 if (read(fd, bf, n) != n)
562 int filename__read_debuglink(const char *filename, char *debuglink,
573 fd = open(filename, O_RDONLY);
577 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
579 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
587 if (gelf_getehdr(elf, &ehdr) == NULL) {
588 pr_err("%s: cannot get elf header.\n", __func__);
592 sec = elf_section_by_name(elf, &ehdr, &shdr,
593 ".gnu_debuglink", NULL);
597 data = elf_getdata(sec, NULL);
601 /* the start of this section is a zero-terminated string */
602 strncpy(debuglink, data->d_buf, size);
614 static int dso__swap_init(struct dso *dso, unsigned char eidata)
616 static unsigned int const endian = 1;
618 dso->needs_swap = DSO_SWAP__NO;
622 /* We are big endian, DSO is little endian. */
623 if (*(unsigned char const *)&endian != 1)
624 dso->needs_swap = DSO_SWAP__YES;
628 /* We are little endian, DSO is big endian. */
629 if (*(unsigned char const *)&endian != 0)
630 dso->needs_swap = DSO_SWAP__YES;
634 pr_err("unrecognized DSO data encoding %d\n", eidata);
641 static int decompress_kmodule(struct dso *dso, const char *name,
642 enum dso_binary_type type)
645 char tmpbuf[] = "/tmp/perf-kmod-XXXXXX";
648 if (type != DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP &&
649 type != DSO_BINARY_TYPE__GUEST_KMODULE_COMP &&
650 type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
653 if (type == DSO_BINARY_TYPE__BUILD_ID_CACHE)
654 name = dso->long_name;
656 if (kmod_path__parse_ext(&m, name) || !m.comp)
659 fd = mkstemp(tmpbuf);
661 dso->load_errno = errno;
665 if (!decompress_to_file(m.ext, name, fd)) {
666 dso->load_errno = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE;
678 bool symsrc__possibly_runtime(struct symsrc *ss)
680 return ss->dynsym || ss->opdsec;
683 bool symsrc__has_symtab(struct symsrc *ss)
685 return ss->symtab != NULL;
688 void symsrc__destroy(struct symsrc *ss)
695 bool __weak elf__needs_adjust_symbols(GElf_Ehdr ehdr)
697 return ehdr.e_type == ET_EXEC || ehdr.e_type == ET_REL;
700 int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
701 enum dso_binary_type type)
708 if (dso__needs_decompress(dso)) {
709 fd = decompress_kmodule(dso, name, type);
713 fd = open(name, O_RDONLY);
715 dso->load_errno = errno;
720 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
722 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
723 dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF;
727 if (gelf_getehdr(elf, &ehdr) == NULL) {
728 dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF;
729 pr_debug("%s: cannot get elf header.\n", __func__);
733 if (dso__swap_init(dso, ehdr.e_ident[EI_DATA])) {
734 dso->load_errno = DSO_LOAD_ERRNO__INTERNAL_ERROR;
738 /* Always reject images with a mismatched build-id: */
739 if (dso->has_build_id && !symbol_conf.ignore_vmlinux_buildid) {
740 u8 build_id[BUILD_ID_SIZE];
742 if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0) {
743 dso->load_errno = DSO_LOAD_ERRNO__CANNOT_READ_BUILDID;
747 if (!dso__build_id_equal(dso, build_id)) {
748 pr_debug("%s: build id mismatch for %s.\n", __func__, name);
749 dso->load_errno = DSO_LOAD_ERRNO__MISMATCHING_BUILDID;
754 ss->is_64_bit = (gelf_getclass(elf) == ELFCLASS64);
756 ss->symtab = elf_section_by_name(elf, &ehdr, &ss->symshdr, ".symtab",
758 if (ss->symshdr.sh_type != SHT_SYMTAB)
762 ss->dynsym = elf_section_by_name(elf, &ehdr, &ss->dynshdr, ".dynsym",
764 if (ss->dynshdr.sh_type != SHT_DYNSYM)
768 ss->opdsec = elf_section_by_name(elf, &ehdr, &ss->opdshdr, ".opd",
770 if (ss->opdshdr.sh_type != SHT_PROGBITS)
773 if (dso->kernel == DSO_TYPE_USER)
774 ss->adjust_symbols = true;
776 ss->adjust_symbols = elf__needs_adjust_symbols(ehdr);
778 ss->name = strdup(name);
780 dso->load_errno = errno;
799 * ref_reloc_sym_not_found - has kernel relocation symbol been found.
800 * @kmap: kernel maps and relocation reference symbol
802 * This function returns %true if we are dealing with the kernel maps and the
803 * relocation reference symbol has not yet been found. Otherwise %false is
806 static bool ref_reloc_sym_not_found(struct kmap *kmap)
808 return kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
809 !kmap->ref_reloc_sym->unrelocated_addr;
813 * ref_reloc - kernel relocation offset.
814 * @kmap: kernel maps and relocation reference symbol
816 * This function returns the offset of kernel addresses as determined by using
817 * the relocation reference symbol i.e. if the kernel has not been relocated
818 * then the return value is zero.
820 static u64 ref_reloc(struct kmap *kmap)
822 if (kmap && kmap->ref_reloc_sym &&
823 kmap->ref_reloc_sym->unrelocated_addr)
824 return kmap->ref_reloc_sym->addr -
825 kmap->ref_reloc_sym->unrelocated_addr;
829 void __weak arch__sym_update(struct symbol *s __maybe_unused,
830 GElf_Sym *sym __maybe_unused) { }
832 int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss,
833 struct symsrc *runtime_ss, int kmodule)
835 struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL;
836 struct map_groups *kmaps = kmap ? map__kmaps(map) : NULL;
837 struct map *curr_map = map;
838 struct dso *curr_dso = dso;
839 Elf_Data *symstrs, *secstrs;
846 Elf_Data *syms, *opddata = NULL;
848 Elf_Scn *sec, *sec_strndx;
851 bool remap_kernel = false, adjust_kernel_syms = false;
856 dso->symtab_type = syms_ss->type;
857 dso->is_64_bit = syms_ss->is_64_bit;
858 dso->rel = syms_ss->ehdr.e_type == ET_REL;
861 * Modules may already have symbols from kallsyms, but those symbols
862 * have the wrong values for the dso maps, so remove them.
864 if (kmodule && syms_ss->symtab)
865 symbols__delete(&dso->symbols[map->type]);
867 if (!syms_ss->symtab) {
869 * If the vmlinux is stripped, fail so we will fall back
870 * to using kallsyms. The vmlinux runtime symbols aren't
876 syms_ss->symtab = syms_ss->dynsym;
877 syms_ss->symshdr = syms_ss->dynshdr;
881 ehdr = syms_ss->ehdr;
882 sec = syms_ss->symtab;
883 shdr = syms_ss->symshdr;
885 if (elf_section_by_name(runtime_ss->elf, &runtime_ss->ehdr, &tshdr,
887 dso->text_offset = tshdr.sh_addr - tshdr.sh_offset;
889 if (runtime_ss->opdsec)
890 opddata = elf_rawdata(runtime_ss->opdsec, NULL);
892 syms = elf_getdata(sec, NULL);
896 sec = elf_getscn(elf, shdr.sh_link);
900 symstrs = elf_getdata(sec, NULL);
904 sec_strndx = elf_getscn(runtime_ss->elf, runtime_ss->ehdr.e_shstrndx);
905 if (sec_strndx == NULL)
908 secstrs = elf_getdata(sec_strndx, NULL);
912 nr_syms = shdr.sh_size / shdr.sh_entsize;
914 memset(&sym, 0, sizeof(sym));
917 * The kernel relocation symbol is needed in advance in order to adjust
918 * kernel maps correctly.
920 if (ref_reloc_sym_not_found(kmap)) {
921 elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
922 const char *elf_name = elf_sym__name(&sym, symstrs);
924 if (strcmp(elf_name, kmap->ref_reloc_sym->name))
926 kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
927 map->reloc = kmap->ref_reloc_sym->addr -
928 kmap->ref_reloc_sym->unrelocated_addr;
934 * Handle any relocation of vdso necessary because older kernels
935 * attempted to prelink vdso to its virtual address.
937 if (dso__is_vdso(dso))
938 map->reloc = map->start - dso->text_offset;
940 dso->adjust_symbols = runtime_ss->adjust_symbols || ref_reloc(kmap);
942 * Initial kernel and module mappings do not map to the dso. For
943 * function mappings, flag the fixups.
945 if (map->type == MAP__FUNCTION && (dso->kernel || kmodule)) {
947 adjust_kernel_syms = dso->adjust_symbols;
949 elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
951 const char *elf_name = elf_sym__name(&sym, symstrs);
952 char *demangled = NULL;
953 int is_label = elf_sym__is_label(&sym);
954 const char *section_name;
955 bool used_opd = false;
957 if (!is_label && !elf_sym__is_a(&sym, map->type))
960 /* Reject ARM ELF "mapping symbols": these aren't unique and
961 * don't identify functions, so will confuse the profile
963 if (ehdr.e_machine == EM_ARM || ehdr.e_machine == EM_AARCH64) {
964 if (elf_name[0] == '$' && strchr("adtx", elf_name[1])
965 && (elf_name[2] == '\0' || elf_name[2] == '.'))
969 if (runtime_ss->opdsec && sym.st_shndx == runtime_ss->opdidx) {
970 u32 offset = sym.st_value - syms_ss->opdshdr.sh_addr;
971 u64 *opd = opddata->d_buf + offset;
972 sym.st_value = DSO__SWAP(dso, u64, *opd);
973 sym.st_shndx = elf_addr_to_index(runtime_ss->elf,
978 * When loading symbols in a data mapping, ABS symbols (which
979 * has a value of SHN_ABS in its st_shndx) failed at
980 * elf_getscn(). And it marks the loading as a failure so
981 * already loaded symbols cannot be fixed up.
983 * I'm not sure what should be done. Just ignore them for now.
986 if (sym.st_shndx == SHN_ABS)
989 sec = elf_getscn(runtime_ss->elf, sym.st_shndx);
993 gelf_getshdr(sec, &shdr);
995 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
998 section_name = elf_sec__name(&shdr, secstrs);
1000 /* On ARM, symbols for thumb functions have 1 added to
1001 * the symbol address as a flag - remove it */
1002 if ((ehdr.e_machine == EM_ARM) &&
1003 (map->type == MAP__FUNCTION) &&
1007 if (dso->kernel || kmodule) {
1008 char dso_name[PATH_MAX];
1010 /* Adjust symbol to map to file offset */
1011 if (adjust_kernel_syms)
1012 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1014 if (strcmp(section_name,
1015 (curr_dso->short_name +
1016 dso->short_name_len)) == 0)
1019 if (strcmp(section_name, ".text") == 0) {
1021 * The initial kernel mapping is based on
1022 * kallsyms and identity maps. Overwrite it to
1023 * map to the kernel dso.
1025 if (remap_kernel && dso->kernel) {
1026 remap_kernel = false;
1027 map->start = shdr.sh_addr +
1029 map->end = map->start + shdr.sh_size;
1030 map->pgoff = shdr.sh_offset;
1031 map->map_ip = map__map_ip;
1032 map->unmap_ip = map__unmap_ip;
1033 /* Ensure maps are correctly ordered */
1036 map_groups__remove(kmaps, map);
1037 map_groups__insert(kmaps, map);
1043 * The initial module mapping is based on
1044 * /proc/modules mapped to offset zero.
1045 * Overwrite it to map to the module dso.
1047 if (remap_kernel && kmodule) {
1048 remap_kernel = false;
1049 map->pgoff = shdr.sh_offset;
1060 snprintf(dso_name, sizeof(dso_name),
1061 "%s%s", dso->short_name, section_name);
1063 curr_map = map_groups__find_by_name(kmaps, map->type, dso_name);
1064 if (curr_map == NULL) {
1065 u64 start = sym.st_value;
1068 start += map->start + shdr.sh_offset;
1070 curr_dso = dso__new(dso_name);
1071 if (curr_dso == NULL)
1073 curr_dso->kernel = dso->kernel;
1074 curr_dso->long_name = dso->long_name;
1075 curr_dso->long_name_len = dso->long_name_len;
1076 curr_map = map__new2(start, curr_dso,
1079 if (curr_map == NULL) {
1082 if (adjust_kernel_syms) {
1083 curr_map->start = shdr.sh_addr +
1085 curr_map->end = curr_map->start +
1087 curr_map->pgoff = shdr.sh_offset;
1089 curr_map->map_ip = identity__map_ip;
1090 curr_map->unmap_ip = identity__map_ip;
1092 curr_dso->symtab_type = dso->symtab_type;
1093 map_groups__insert(kmaps, curr_map);
1095 * Add it before we drop the referece to curr_map,
1096 * i.e. while we still are sure to have a reference
1097 * to this DSO via curr_map->dso.
1099 dsos__add(&map->groups->machine->dsos, curr_dso);
1100 /* kmaps already got it */
1102 dso__set_loaded(curr_dso, map->type);
1104 curr_dso = curr_map->dso;
1109 if ((used_opd && runtime_ss->adjust_symbols)
1110 || (!used_opd && syms_ss->adjust_symbols)) {
1111 pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
1112 "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
1113 (u64)sym.st_value, (u64)shdr.sh_addr,
1114 (u64)shdr.sh_offset);
1115 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1118 demangled = demangle_sym(dso, kmodule, elf_name);
1119 if (demangled != NULL)
1120 elf_name = demangled;
1122 f = symbol__new(sym.st_value, sym.st_size,
1123 GELF_ST_BIND(sym.st_info), elf_name);
1128 arch__sym_update(f, &sym);
1130 __symbols__insert(&curr_dso->symbols[curr_map->type], f, dso->kernel);
1135 * For misannotated, zeroed, ASM function sizes.
1138 symbols__fixup_end(&dso->symbols[map->type]);
1139 symbols__fixup_duplicate(&dso->symbols[map->type]);
1142 * We need to fixup this here too because we create new
1143 * maps here, for things like vsyscall sections.
1145 __map_groups__fixup_end(kmaps, map->type);
1153 static int elf_read_maps(Elf *elf, bool exe, mapfn_t mapfn, void *data)
1160 if (elf_getphdrnum(elf, &phdrnum))
1163 for (i = 0; i < phdrnum; i++) {
1164 if (gelf_getphdr(elf, i, &phdr) == NULL)
1166 if (phdr.p_type != PT_LOAD)
1169 if (!(phdr.p_flags & PF_X))
1172 if (!(phdr.p_flags & PF_R))
1175 sz = min(phdr.p_memsz, phdr.p_filesz);
1178 err = mapfn(phdr.p_vaddr, sz, phdr.p_offset, data);
1185 int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data,
1191 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1196 *is_64_bit = (gelf_getclass(elf) == ELFCLASS64);
1198 err = elf_read_maps(elf, exe, mapfn, data);
1204 enum dso_type dso__type_fd(int fd)
1206 enum dso_type dso_type = DSO__TYPE_UNKNOWN;
1211 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1216 if (ek != ELF_K_ELF)
1219 if (gelf_getclass(elf) == ELFCLASS64) {
1220 dso_type = DSO__TYPE_64BIT;
1224 if (gelf_getehdr(elf, &ehdr) == NULL)
1227 if (ehdr.e_machine == EM_X86_64)
1228 dso_type = DSO__TYPE_X32BIT;
1230 dso_type = DSO__TYPE_32BIT;
1237 static int copy_bytes(int from, off_t from_offs, int to, off_t to_offs, u64 len)
1242 char *buf = malloc(page_size);
1247 if (lseek(to, to_offs, SEEK_SET) != to_offs)
1250 if (lseek(from, from_offs, SEEK_SET) != from_offs)
1257 /* Use read because mmap won't work on proc files */
1258 r = read(from, buf, n);
1264 r = write(to, buf, n);
1285 static int kcore__open(struct kcore *kcore, const char *filename)
1289 kcore->fd = open(filename, O_RDONLY);
1290 if (kcore->fd == -1)
1293 kcore->elf = elf_begin(kcore->fd, ELF_C_READ, NULL);
1297 kcore->elfclass = gelf_getclass(kcore->elf);
1298 if (kcore->elfclass == ELFCLASSNONE)
1301 ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr);
1308 elf_end(kcore->elf);
1314 static int kcore__init(struct kcore *kcore, char *filename, int elfclass,
1317 kcore->elfclass = elfclass;
1320 kcore->fd = mkstemp(filename);
1322 kcore->fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400);
1323 if (kcore->fd == -1)
1326 kcore->elf = elf_begin(kcore->fd, ELF_C_WRITE, NULL);
1330 if (!gelf_newehdr(kcore->elf, elfclass))
1333 memset(&kcore->ehdr, 0, sizeof(GElf_Ehdr));
1338 elf_end(kcore->elf);
1345 static void kcore__close(struct kcore *kcore)
1347 elf_end(kcore->elf);
1351 static int kcore__copy_hdr(struct kcore *from, struct kcore *to, size_t count)
1353 GElf_Ehdr *ehdr = &to->ehdr;
1354 GElf_Ehdr *kehdr = &from->ehdr;
1356 memcpy(ehdr->e_ident, kehdr->e_ident, EI_NIDENT);
1357 ehdr->e_type = kehdr->e_type;
1358 ehdr->e_machine = kehdr->e_machine;
1359 ehdr->e_version = kehdr->e_version;
1362 ehdr->e_flags = kehdr->e_flags;
1363 ehdr->e_phnum = count;
1364 ehdr->e_shentsize = 0;
1366 ehdr->e_shstrndx = 0;
1368 if (from->elfclass == ELFCLASS32) {
1369 ehdr->e_phoff = sizeof(Elf32_Ehdr);
1370 ehdr->e_ehsize = sizeof(Elf32_Ehdr);
1371 ehdr->e_phentsize = sizeof(Elf32_Phdr);
1373 ehdr->e_phoff = sizeof(Elf64_Ehdr);
1374 ehdr->e_ehsize = sizeof(Elf64_Ehdr);
1375 ehdr->e_phentsize = sizeof(Elf64_Phdr);
1378 if (!gelf_update_ehdr(to->elf, ehdr))
1381 if (!gelf_newphdr(to->elf, count))
1387 static int kcore__add_phdr(struct kcore *kcore, int idx, off_t offset,
1392 .p_flags = PF_R | PF_W | PF_X,
1398 .p_align = page_size,
1401 if (!gelf_update_phdr(kcore->elf, idx, &phdr))
1407 static off_t kcore__write(struct kcore *kcore)
1409 return elf_update(kcore->elf, ELF_C_WRITE);
1418 struct kcore_copy_info {
1424 u64 first_module_symbol;
1425 u64 last_module_symbol;
1426 struct phdr_data kernel_map;
1427 struct phdr_data modules_map;
1430 static int kcore_copy__process_kallsyms(void *arg, const char *name, char type,
1433 struct kcore_copy_info *kci = arg;
1435 if (!symbol_type__is_a(type, MAP__FUNCTION))
1438 if (strchr(name, '[')) {
1439 if (!kci->first_module_symbol || start < kci->first_module_symbol)
1440 kci->first_module_symbol = start;
1441 if (start > kci->last_module_symbol)
1442 kci->last_module_symbol = start;
1446 if (!kci->first_symbol || start < kci->first_symbol)
1447 kci->first_symbol = start;
1449 if (!kci->last_symbol || start > kci->last_symbol)
1450 kci->last_symbol = start;
1452 if (!strcmp(name, "_stext")) {
1457 if (!strcmp(name, "_etext")) {
1465 static int kcore_copy__parse_kallsyms(struct kcore_copy_info *kci,
1468 char kallsyms_filename[PATH_MAX];
1470 scnprintf(kallsyms_filename, PATH_MAX, "%s/kallsyms", dir);
1472 if (symbol__restricted_filename(kallsyms_filename, "/proc/kallsyms"))
1475 if (kallsyms__parse(kallsyms_filename, kci,
1476 kcore_copy__process_kallsyms) < 0)
1482 static int kcore_copy__process_modules(void *arg,
1483 const char *name __maybe_unused,
1484 u64 start, u64 size __maybe_unused)
1486 struct kcore_copy_info *kci = arg;
1488 if (!kci->first_module || start < kci->first_module)
1489 kci->first_module = start;
1494 static int kcore_copy__parse_modules(struct kcore_copy_info *kci,
1497 char modules_filename[PATH_MAX];
1499 scnprintf(modules_filename, PATH_MAX, "%s/modules", dir);
1501 if (symbol__restricted_filename(modules_filename, "/proc/modules"))
1504 if (modules__parse(modules_filename, kci,
1505 kcore_copy__process_modules) < 0)
1511 static void kcore_copy__map(struct phdr_data *p, u64 start, u64 end, u64 pgoff,
1514 if (p->addr || s < start || s >= end)
1518 p->offset = (s - start) + pgoff;
1519 p->len = e < end ? e - s : end - s;
1522 static int kcore_copy__read_map(u64 start, u64 len, u64 pgoff, void *data)
1524 struct kcore_copy_info *kci = data;
1525 u64 end = start + len;
1527 kcore_copy__map(&kci->kernel_map, start, end, pgoff, kci->stext,
1530 kcore_copy__map(&kci->modules_map, start, end, pgoff, kci->first_module,
1531 kci->last_module_symbol);
1536 static int kcore_copy__read_maps(struct kcore_copy_info *kci, Elf *elf)
1538 if (elf_read_maps(elf, true, kcore_copy__read_map, kci) < 0)
1544 static int kcore_copy__calc_maps(struct kcore_copy_info *kci, const char *dir,
1547 if (kcore_copy__parse_kallsyms(kci, dir))
1550 if (kcore_copy__parse_modules(kci, dir))
1554 kci->stext = round_down(kci->stext, page_size);
1556 kci->stext = round_down(kci->first_symbol, page_size);
1559 kci->etext = round_up(kci->etext, page_size);
1560 } else if (kci->last_symbol) {
1561 kci->etext = round_up(kci->last_symbol, page_size);
1562 kci->etext += page_size;
1565 if (kci->first_module_symbol &&
1566 (!kci->first_module || kci->first_module_symbol < kci->first_module))
1567 kci->first_module = kci->first_module_symbol;
1569 kci->first_module = round_down(kci->first_module, page_size);
1571 if (kci->last_module_symbol) {
1572 kci->last_module_symbol = round_up(kci->last_module_symbol,
1574 kci->last_module_symbol += page_size;
1577 if (!kci->stext || !kci->etext)
1580 if (kci->first_module && !kci->last_module_symbol)
1583 return kcore_copy__read_maps(kci, elf);
1586 static int kcore_copy__copy_file(const char *from_dir, const char *to_dir,
1589 char from_filename[PATH_MAX];
1590 char to_filename[PATH_MAX];
1592 scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name);
1593 scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name);
1595 return copyfile_mode(from_filename, to_filename, 0400);
1598 static int kcore_copy__unlink(const char *dir, const char *name)
1600 char filename[PATH_MAX];
1602 scnprintf(filename, PATH_MAX, "%s/%s", dir, name);
1604 return unlink(filename);
1607 static int kcore_copy__compare_fds(int from, int to)
1615 buf_from = malloc(page_size);
1616 buf_to = malloc(page_size);
1617 if (!buf_from || !buf_to)
1621 /* Use read because mmap won't work on proc files */
1622 ret = read(from, buf_from, page_size);
1631 if (readn(to, buf_to, len) != (int)len)
1634 if (memcmp(buf_from, buf_to, len))
1645 static int kcore_copy__compare_files(const char *from_filename,
1646 const char *to_filename)
1648 int from, to, err = -1;
1650 from = open(from_filename, O_RDONLY);
1654 to = open(to_filename, O_RDONLY);
1656 goto out_close_from;
1658 err = kcore_copy__compare_fds(from, to);
1666 static int kcore_copy__compare_file(const char *from_dir, const char *to_dir,
1669 char from_filename[PATH_MAX];
1670 char to_filename[PATH_MAX];
1672 scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name);
1673 scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name);
1675 return kcore_copy__compare_files(from_filename, to_filename);
1679 * kcore_copy - copy kallsyms, modules and kcore from one directory to another.
1680 * @from_dir: from directory
1681 * @to_dir: to directory
1683 * This function copies kallsyms, modules and kcore files from one directory to
1684 * another. kallsyms and modules are copied entirely. Only code segments are
1685 * copied from kcore. It is assumed that two segments suffice: one for the
1686 * kernel proper and one for all the modules. The code segments are determined
1687 * from kallsyms and modules files. The kernel map starts at _stext or the
1688 * lowest function symbol, and ends at _etext or the highest function symbol.
1689 * The module map starts at the lowest module address and ends at the highest
1690 * module symbol. Start addresses are rounded down to the nearest page. End
1691 * addresses are rounded up to the nearest page. An extra page is added to the
1692 * highest kernel symbol and highest module symbol to, hopefully, encompass that
1693 * symbol too. Because it contains only code sections, the resulting kcore is
1694 * unusual. One significant peculiarity is that the mapping (start -> pgoff)
1695 * is not the same for the kernel map and the modules map. That happens because
1696 * the data is copied adjacently whereas the original kcore has gaps. Finally,
1697 * kallsyms and modules files are compared with their copies to check that
1698 * modules have not been loaded or unloaded while the copies were taking place.
1700 * Return: %0 on success, %-1 on failure.
1702 int kcore_copy(const char *from_dir, const char *to_dir)
1705 struct kcore extract;
1707 int idx = 0, err = -1;
1708 off_t offset = page_size, sz, modules_offset = 0;
1709 struct kcore_copy_info kci = { .stext = 0, };
1710 char kcore_filename[PATH_MAX];
1711 char extract_filename[PATH_MAX];
1713 if (kcore_copy__copy_file(from_dir, to_dir, "kallsyms"))
1716 if (kcore_copy__copy_file(from_dir, to_dir, "modules"))
1717 goto out_unlink_kallsyms;
1719 scnprintf(kcore_filename, PATH_MAX, "%s/kcore", from_dir);
1720 scnprintf(extract_filename, PATH_MAX, "%s/kcore", to_dir);
1722 if (kcore__open(&kcore, kcore_filename))
1723 goto out_unlink_modules;
1725 if (kcore_copy__calc_maps(&kci, from_dir, kcore.elf))
1726 goto out_kcore_close;
1728 if (kcore__init(&extract, extract_filename, kcore.elfclass, false))
1729 goto out_kcore_close;
1731 if (!kci.modules_map.addr)
1734 if (kcore__copy_hdr(&kcore, &extract, count))
1735 goto out_extract_close;
1737 if (kcore__add_phdr(&extract, idx++, offset, kci.kernel_map.addr,
1738 kci.kernel_map.len))
1739 goto out_extract_close;
1741 if (kci.modules_map.addr) {
1742 modules_offset = offset + kci.kernel_map.len;
1743 if (kcore__add_phdr(&extract, idx, modules_offset,
1744 kci.modules_map.addr, kci.modules_map.len))
1745 goto out_extract_close;
1748 sz = kcore__write(&extract);
1749 if (sz < 0 || sz > offset)
1750 goto out_extract_close;
1752 if (copy_bytes(kcore.fd, kci.kernel_map.offset, extract.fd, offset,
1753 kci.kernel_map.len))
1754 goto out_extract_close;
1756 if (modules_offset && copy_bytes(kcore.fd, kci.modules_map.offset,
1757 extract.fd, modules_offset,
1758 kci.modules_map.len))
1759 goto out_extract_close;
1761 if (kcore_copy__compare_file(from_dir, to_dir, "modules"))
1762 goto out_extract_close;
1764 if (kcore_copy__compare_file(from_dir, to_dir, "kallsyms"))
1765 goto out_extract_close;
1770 kcore__close(&extract);
1772 unlink(extract_filename);
1774 kcore__close(&kcore);
1777 kcore_copy__unlink(to_dir, "modules");
1778 out_unlink_kallsyms:
1780 kcore_copy__unlink(to_dir, "kallsyms");
1785 int kcore_extract__create(struct kcore_extract *kce)
1788 struct kcore extract;
1790 int idx = 0, err = -1;
1791 off_t offset = page_size, sz;
1793 if (kcore__open(&kcore, kce->kcore_filename))
1796 strcpy(kce->extract_filename, PERF_KCORE_EXTRACT);
1797 if (kcore__init(&extract, kce->extract_filename, kcore.elfclass, true))
1798 goto out_kcore_close;
1800 if (kcore__copy_hdr(&kcore, &extract, count))
1801 goto out_extract_close;
1803 if (kcore__add_phdr(&extract, idx, offset, kce->addr, kce->len))
1804 goto out_extract_close;
1806 sz = kcore__write(&extract);
1807 if (sz < 0 || sz > offset)
1808 goto out_extract_close;
1810 if (copy_bytes(kcore.fd, kce->offs, extract.fd, offset, kce->len))
1811 goto out_extract_close;
1816 kcore__close(&extract);
1818 unlink(kce->extract_filename);
1820 kcore__close(&kcore);
1825 void kcore_extract__delete(struct kcore_extract *kce)
1827 unlink(kce->extract_filename);
1830 #ifdef HAVE_GELF_GETNOTE_SUPPORT
1832 * populate_sdt_note : Parse raw data and identify SDT note
1833 * @elf: elf of the opened file
1834 * @data: raw data of a section with description offset applied
1835 * @len: note description size
1836 * @type: type of the note
1837 * @sdt_notes: List to add the SDT note
1839 * Responsible for parsing the @data in section .note.stapsdt in @elf and
1840 * if its an SDT note, it appends to @sdt_notes list.
1842 static int populate_sdt_note(Elf **elf, const char *data, size_t len,
1843 struct list_head *sdt_notes)
1845 const char *provider, *name;
1846 struct sdt_note *tmp = NULL;
1848 GElf_Addr base_off = 0;
1853 Elf64_Addr a64[NR_ADDR];
1854 Elf32_Addr a32[NR_ADDR];
1858 .d_buf = &buf, .d_type = ELF_T_ADDR, .d_version = EV_CURRENT,
1859 .d_size = gelf_fsize((*elf), ELF_T_ADDR, NR_ADDR, EV_CURRENT),
1860 .d_off = 0, .d_align = 0
1863 .d_buf = (void *) data, .d_type = ELF_T_ADDR,
1864 .d_version = EV_CURRENT, .d_size = dst.d_size, .d_off = 0,
1868 tmp = (struct sdt_note *)calloc(1, sizeof(struct sdt_note));
1874 INIT_LIST_HEAD(&tmp->note_list);
1876 if (len < dst.d_size + 3)
1879 /* Translation from file representation to memory representation */
1880 if (gelf_xlatetom(*elf, &dst, &src,
1881 elf_getident(*elf, NULL)[EI_DATA]) == NULL) {
1882 pr_err("gelf_xlatetom : %s\n", elf_errmsg(-1));
1886 /* Populate the fields of sdt_note */
1887 provider = data + dst.d_size;
1889 name = (const char *)memchr(provider, '\0', data + len - provider);
1893 tmp->provider = strdup(provider);
1894 if (!tmp->provider) {
1898 tmp->name = strdup(name);
1904 if (gelf_getclass(*elf) == ELFCLASS32) {
1905 memcpy(&tmp->addr, &buf, 3 * sizeof(Elf32_Addr));
1908 memcpy(&tmp->addr, &buf, 3 * sizeof(Elf64_Addr));
1912 if (!gelf_getehdr(*elf, &ehdr)) {
1913 pr_debug("%s : cannot get elf header.\n", __func__);
1918 /* Adjust the prelink effect :
1919 * Find out the .stapsdt.base section.
1920 * This scn will help us to handle prelinking (if present).
1921 * Compare the retrieved file offset of the base section with the
1922 * base address in the description of the SDT note. If its different,
1923 * then accordingly, adjust the note location.
1925 if (elf_section_by_name(*elf, &ehdr, &shdr, SDT_BASE_SCN, NULL)) {
1926 base_off = shdr.sh_offset;
1929 tmp->addr.a32[0] = tmp->addr.a32[0] + base_off -
1932 tmp->addr.a64[0] = tmp->addr.a64[0] + base_off -
1937 list_add_tail(&tmp->note_list, sdt_notes);
1943 free(tmp->provider);
1951 * construct_sdt_notes_list : constructs a list of SDT notes
1952 * @elf : elf to look into
1953 * @sdt_notes : empty list_head
1955 * Scans the sections in 'elf' for the section
1956 * .note.stapsdt. It, then calls populate_sdt_note to find
1957 * out the SDT events and populates the 'sdt_notes'.
1959 static int construct_sdt_notes_list(Elf *elf, struct list_head *sdt_notes)
1962 Elf_Scn *scn = NULL;
1965 size_t shstrndx, next;
1967 size_t name_off, desc_off, offset;
1970 if (gelf_getehdr(elf, &ehdr) == NULL) {
1974 if (elf_getshdrstrndx(elf, &shstrndx) != 0) {
1979 /* Look for the required section */
1980 scn = elf_section_by_name(elf, &ehdr, &shdr, SDT_NOTE_SCN, NULL);
1986 if ((shdr.sh_type != SHT_NOTE) || (shdr.sh_flags & SHF_ALLOC)) {
1991 data = elf_getdata(scn, NULL);
1993 /* Get the SDT notes */
1994 for (offset = 0; (next = gelf_getnote(data, offset, &nhdr, &name_off,
1995 &desc_off)) > 0; offset = next) {
1996 if (nhdr.n_namesz == sizeof(SDT_NOTE_NAME) &&
1997 !memcmp(data->d_buf + name_off, SDT_NOTE_NAME,
1998 sizeof(SDT_NOTE_NAME))) {
1999 /* Check the type of the note */
2000 if (nhdr.n_type != SDT_NOTE_TYPE)
2003 ret = populate_sdt_note(&elf, ((data->d_buf) + desc_off),
2004 nhdr.n_descsz, sdt_notes);
2009 if (list_empty(sdt_notes))
2017 * get_sdt_note_list : Wrapper to construct a list of sdt notes
2018 * @head : empty list_head
2019 * @target : file to find SDT notes from
2021 * This opens the file, initializes
2022 * the ELF and then calls construct_sdt_notes_list.
2024 int get_sdt_note_list(struct list_head *head, const char *target)
2029 fd = open(target, O_RDONLY);
2033 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
2038 ret = construct_sdt_notes_list(elf, head);
2046 * cleanup_sdt_note_list : free the sdt notes' list
2047 * @sdt_notes: sdt notes' list
2049 * Free up the SDT notes in @sdt_notes.
2050 * Returns the number of SDT notes free'd.
2052 int cleanup_sdt_note_list(struct list_head *sdt_notes)
2054 struct sdt_note *tmp, *pos;
2057 list_for_each_entry_safe(pos, tmp, sdt_notes, note_list) {
2058 list_del(&pos->note_list);
2060 free(pos->provider);
2068 * sdt_notes__get_count: Counts the number of sdt events
2069 * @start: list_head to sdt_notes list
2071 * Returns the number of SDT notes in a list
2073 int sdt_notes__get_count(struct list_head *start)
2075 struct sdt_note *sdt_ptr;
2078 list_for_each_entry(sdt_ptr, start, note_list)
2084 void symbol__elf_init(void)
2086 elf_version(EV_CURRENT);