9 #include "demangle-java.h"
12 #include <symbol/kallsyms.h>
16 #define EM_AARCH64 183 /* ARM 64 bit */
20 #ifdef HAVE_CPLUS_DEMANGLE_SUPPORT
21 extern char *cplus_demangle(const char *, int);
23 static inline char *bfd_demangle(void __maybe_unused *v, const char *c, int i)
25 return cplus_demangle(c, i);
29 static inline char *bfd_demangle(void __maybe_unused *v,
30 const char __maybe_unused *c,
36 #define PACKAGE 'perf'
41 #ifndef HAVE_ELF_GETPHDRNUM_SUPPORT
42 static int elf_getphdrnum(Elf *elf, size_t *dst)
47 ehdr = gelf_getehdr(elf, &gehdr);
57 #ifndef NT_GNU_BUILD_ID
58 #define NT_GNU_BUILD_ID 3
62 * elf_symtab__for_each_symbol - iterate thru all the symbols
64 * @syms: struct elf_symtab instance to iterate
66 * @sym: GElf_Sym iterator
68 #define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
69 for (idx = 0, gelf_getsym(syms, idx, &sym);\
71 idx++, gelf_getsym(syms, idx, &sym))
73 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
75 return GELF_ST_TYPE(sym->st_info);
79 #define STT_GNU_IFUNC 10
82 static inline int elf_sym__is_function(const GElf_Sym *sym)
84 return (elf_sym__type(sym) == STT_FUNC ||
85 elf_sym__type(sym) == STT_GNU_IFUNC) &&
87 sym->st_shndx != SHN_UNDEF;
90 static inline bool elf_sym__is_object(const GElf_Sym *sym)
92 return elf_sym__type(sym) == STT_OBJECT &&
94 sym->st_shndx != SHN_UNDEF;
97 static inline int elf_sym__is_label(const GElf_Sym *sym)
99 return elf_sym__type(sym) == STT_NOTYPE &&
101 sym->st_shndx != SHN_UNDEF &&
102 sym->st_shndx != SHN_ABS;
105 static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type)
109 return elf_sym__is_function(sym);
111 return elf_sym__is_object(sym);
117 static inline const char *elf_sym__name(const GElf_Sym *sym,
118 const Elf_Data *symstrs)
120 return symstrs->d_buf + sym->st_name;
123 static inline const char *elf_sec__name(const GElf_Shdr *shdr,
124 const Elf_Data *secstrs)
126 return secstrs->d_buf + shdr->sh_name;
129 static inline int elf_sec__is_text(const GElf_Shdr *shdr,
130 const Elf_Data *secstrs)
132 return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
135 static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
136 const Elf_Data *secstrs)
138 return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
141 static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs,
146 return elf_sec__is_text(shdr, secstrs);
148 return elf_sec__is_data(shdr, secstrs);
154 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
160 while ((sec = elf_nextscn(elf, sec)) != NULL) {
161 gelf_getshdr(sec, &shdr);
163 if ((addr >= shdr.sh_addr) &&
164 (addr < (shdr.sh_addr + shdr.sh_size)))
173 Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
174 GElf_Shdr *shp, const char *name, size_t *idx)
179 /* Elf is corrupted/truncated, avoid calling elf_strptr. */
180 if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL))
183 while ((sec = elf_nextscn(elf, sec)) != NULL) {
186 gelf_getshdr(sec, shp);
187 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
188 if (str && !strcmp(name, str)) {
199 #define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
200 for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
202 ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
204 #define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
205 for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
207 ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
210 * We need to check if we have a .dynsym, so that we can handle the
211 * .plt, synthesizing its symbols, that aren't on the symtabs (be it
212 * .dynsym or .symtab).
213 * And always look at the original dso, not at debuginfo packages, that
214 * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
216 int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map *map,
217 symbol_filter_t filter)
219 uint32_t nr_rel_entries, idx;
224 GElf_Shdr shdr_rel_plt, shdr_dynsym;
225 Elf_Data *reldata, *syms, *symstrs;
226 Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
229 char sympltname[1024];
231 int nr = 0, symidx, err = 0;
239 scn_dynsym = ss->dynsym;
240 shdr_dynsym = ss->dynshdr;
241 dynsym_idx = ss->dynsym_idx;
243 if (scn_dynsym == NULL)
246 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
248 if (scn_plt_rel == NULL) {
249 scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
251 if (scn_plt_rel == NULL)
257 if (shdr_rel_plt.sh_link != dynsym_idx)
260 if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
264 * Fetch the relocation section to find the idxes to the GOT
265 * and the symbols in the .dynsym they refer to.
267 reldata = elf_getdata(scn_plt_rel, NULL);
271 syms = elf_getdata(scn_dynsym, NULL);
275 scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
276 if (scn_symstrs == NULL)
279 symstrs = elf_getdata(scn_symstrs, NULL);
283 if (symstrs->d_size == 0)
286 nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
287 plt_offset = shdr_plt.sh_offset;
289 if (shdr_rel_plt.sh_type == SHT_RELA) {
290 GElf_Rela pos_mem, *pos;
292 elf_section__for_each_rela(reldata, pos, pos_mem, idx,
294 symidx = GELF_R_SYM(pos->r_info);
295 plt_offset += shdr_plt.sh_entsize;
296 gelf_getsym(syms, symidx, &sym);
297 snprintf(sympltname, sizeof(sympltname),
298 "%s@plt", elf_sym__name(&sym, symstrs));
300 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
301 STB_GLOBAL, sympltname);
305 if (filter && filter(map, f))
308 symbols__insert(&dso->symbols[map->type], f);
312 } else if (shdr_rel_plt.sh_type == SHT_REL) {
313 GElf_Rel pos_mem, *pos;
314 elf_section__for_each_rel(reldata, pos, pos_mem, idx,
316 symidx = GELF_R_SYM(pos->r_info);
317 plt_offset += shdr_plt.sh_entsize;
318 gelf_getsym(syms, symidx, &sym);
319 snprintf(sympltname, sizeof(sympltname),
320 "%s@plt", elf_sym__name(&sym, symstrs));
322 f = symbol__new(plt_offset, shdr_plt.sh_entsize,
323 STB_GLOBAL, sympltname);
327 if (filter && filter(map, f))
330 symbols__insert(&dso->symbols[map->type], f);
340 pr_debug("%s: problems reading %s PLT info.\n",
341 __func__, dso->long_name);
346 * Align offset to 4 bytes as needed for note name and descriptor data.
348 #define NOTE_ALIGN(n) (((n) + 3) & -4U)
350 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
360 if (size < BUILD_ID_SIZE)
367 if (gelf_getehdr(elf, &ehdr) == NULL) {
368 pr_err("%s: cannot get elf header.\n", __func__);
373 * Check following sections for notes:
374 * '.note.gnu.build-id'
376 * '.note' (VDSO specific)
379 sec = elf_section_by_name(elf, &ehdr, &shdr,
380 ".note.gnu.build-id", NULL);
384 sec = elf_section_by_name(elf, &ehdr, &shdr,
389 sec = elf_section_by_name(elf, &ehdr, &shdr,
398 data = elf_getdata(sec, NULL);
403 while (ptr < (data->d_buf + data->d_size)) {
404 GElf_Nhdr *nhdr = ptr;
405 size_t namesz = NOTE_ALIGN(nhdr->n_namesz),
406 descsz = NOTE_ALIGN(nhdr->n_descsz);
409 ptr += sizeof(*nhdr);
412 if (nhdr->n_type == NT_GNU_BUILD_ID &&
413 nhdr->n_namesz == sizeof("GNU")) {
414 if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
415 size_t sz = min(size, descsz);
417 memset(bf + sz, 0, size - sz);
429 int filename__read_build_id(const char *filename, void *bf, size_t size)
434 if (size < BUILD_ID_SIZE)
437 fd = open(filename, O_RDONLY);
441 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
443 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
447 err = elf_read_build_id(elf, bf, size);
456 int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
460 if (size < BUILD_ID_SIZE)
463 fd = open(filename, O_RDONLY);
470 size_t namesz, descsz;
472 if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
475 namesz = NOTE_ALIGN(nhdr.n_namesz);
476 descsz = NOTE_ALIGN(nhdr.n_descsz);
477 if (nhdr.n_type == NT_GNU_BUILD_ID &&
478 nhdr.n_namesz == sizeof("GNU")) {
479 if (read(fd, bf, namesz) != (ssize_t)namesz)
481 if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
482 size_t sz = min(descsz, size);
483 if (read(fd, build_id, sz) == (ssize_t)sz) {
484 memset(build_id + sz, 0, size - sz);
488 } else if (read(fd, bf, descsz) != (ssize_t)descsz)
491 int n = namesz + descsz;
492 if (read(fd, bf, n) != n)
501 int filename__read_debuglink(const char *filename, char *debuglink,
512 fd = open(filename, O_RDONLY);
516 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
518 pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
526 if (gelf_getehdr(elf, &ehdr) == NULL) {
527 pr_err("%s: cannot get elf header.\n", __func__);
531 sec = elf_section_by_name(elf, &ehdr, &shdr,
532 ".gnu_debuglink", NULL);
536 data = elf_getdata(sec, NULL);
540 /* the start of this section is a zero-terminated string */
541 strncpy(debuglink, data->d_buf, size);
553 static int dso__swap_init(struct dso *dso, unsigned char eidata)
555 static unsigned int const endian = 1;
557 dso->needs_swap = DSO_SWAP__NO;
561 /* We are big endian, DSO is little endian. */
562 if (*(unsigned char const *)&endian != 1)
563 dso->needs_swap = DSO_SWAP__YES;
567 /* We are little endian, DSO is big endian. */
568 if (*(unsigned char const *)&endian != 0)
569 dso->needs_swap = DSO_SWAP__YES;
573 pr_err("unrecognized DSO data encoding %d\n", eidata);
580 static int decompress_kmodule(struct dso *dso, const char *name,
581 enum dso_binary_type type)
584 char tmpbuf[] = "/tmp/perf-kmod-XXXXXX";
587 if (type != DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP &&
588 type != DSO_BINARY_TYPE__GUEST_KMODULE_COMP &&
589 type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
592 if (type == DSO_BINARY_TYPE__BUILD_ID_CACHE)
593 name = dso->long_name;
595 if (kmod_path__parse_ext(&m, name) || !m.comp)
598 fd = mkstemp(tmpbuf);
600 dso->load_errno = errno;
604 if (!decompress_to_file(m.ext, name, fd)) {
605 dso->load_errno = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE;
617 bool symsrc__possibly_runtime(struct symsrc *ss)
619 return ss->dynsym || ss->opdsec;
622 bool symsrc__has_symtab(struct symsrc *ss)
624 return ss->symtab != NULL;
627 void symsrc__destroy(struct symsrc *ss)
634 bool __weak elf__needs_adjust_symbols(GElf_Ehdr ehdr)
636 return ehdr.e_type == ET_EXEC || ehdr.e_type == ET_REL;
639 int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
640 enum dso_binary_type type)
647 if (dso__needs_decompress(dso)) {
648 fd = decompress_kmodule(dso, name, type);
652 fd = open(name, O_RDONLY);
654 dso->load_errno = errno;
659 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
661 pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
662 dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF;
666 if (gelf_getehdr(elf, &ehdr) == NULL) {
667 dso->load_errno = DSO_LOAD_ERRNO__INVALID_ELF;
668 pr_debug("%s: cannot get elf header.\n", __func__);
672 if (dso__swap_init(dso, ehdr.e_ident[EI_DATA])) {
673 dso->load_errno = DSO_LOAD_ERRNO__INTERNAL_ERROR;
677 /* Always reject images with a mismatched build-id: */
678 if (dso->has_build_id) {
679 u8 build_id[BUILD_ID_SIZE];
681 if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0) {
682 dso->load_errno = DSO_LOAD_ERRNO__CANNOT_READ_BUILDID;
686 if (!dso__build_id_equal(dso, build_id)) {
687 pr_debug("%s: build id mismatch for %s.\n", __func__, name);
688 dso->load_errno = DSO_LOAD_ERRNO__MISMATCHING_BUILDID;
693 ss->is_64_bit = (gelf_getclass(elf) == ELFCLASS64);
695 ss->symtab = elf_section_by_name(elf, &ehdr, &ss->symshdr, ".symtab",
697 if (ss->symshdr.sh_type != SHT_SYMTAB)
701 ss->dynsym = elf_section_by_name(elf, &ehdr, &ss->dynshdr, ".dynsym",
703 if (ss->dynshdr.sh_type != SHT_DYNSYM)
707 ss->opdsec = elf_section_by_name(elf, &ehdr, &ss->opdshdr, ".opd",
709 if (ss->opdshdr.sh_type != SHT_PROGBITS)
712 if (dso->kernel == DSO_TYPE_USER) {
714 ss->adjust_symbols = (ehdr.e_type == ET_EXEC ||
715 ehdr.e_type == ET_REL ||
717 elf_section_by_name(elf, &ehdr, &shdr,
721 ss->adjust_symbols = elf__needs_adjust_symbols(ehdr);
724 ss->name = strdup(name);
726 dso->load_errno = errno;
745 * ref_reloc_sym_not_found - has kernel relocation symbol been found.
746 * @kmap: kernel maps and relocation reference symbol
748 * This function returns %true if we are dealing with the kernel maps and the
749 * relocation reference symbol has not yet been found. Otherwise %false is
752 static bool ref_reloc_sym_not_found(struct kmap *kmap)
754 return kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
755 !kmap->ref_reloc_sym->unrelocated_addr;
759 * ref_reloc - kernel relocation offset.
760 * @kmap: kernel maps and relocation reference symbol
762 * This function returns the offset of kernel addresses as determined by using
763 * the relocation reference symbol i.e. if the kernel has not been relocated
764 * then the return value is zero.
766 static u64 ref_reloc(struct kmap *kmap)
768 if (kmap && kmap->ref_reloc_sym &&
769 kmap->ref_reloc_sym->unrelocated_addr)
770 return kmap->ref_reloc_sym->addr -
771 kmap->ref_reloc_sym->unrelocated_addr;
775 static bool want_demangle(bool is_kernel_sym)
777 return is_kernel_sym ? symbol_conf.demangle_kernel : symbol_conf.demangle;
780 void __weak arch__elf_sym_adjust(GElf_Sym *sym __maybe_unused) { }
782 int dso__load_sym(struct dso *dso, struct map *map,
783 struct symsrc *syms_ss, struct symsrc *runtime_ss,
784 symbol_filter_t filter, int kmodule)
786 struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL;
787 struct map_groups *kmaps = kmap ? map__kmaps(map) : NULL;
788 struct map *curr_map = map;
789 struct dso *curr_dso = dso;
790 Elf_Data *symstrs, *secstrs;
797 Elf_Data *syms, *opddata = NULL;
799 Elf_Scn *sec, *sec_strndx;
802 bool remap_kernel = false, adjust_kernel_syms = false;
807 dso->symtab_type = syms_ss->type;
808 dso->is_64_bit = syms_ss->is_64_bit;
809 dso->rel = syms_ss->ehdr.e_type == ET_REL;
812 * Modules may already have symbols from kallsyms, but those symbols
813 * have the wrong values for the dso maps, so remove them.
815 if (kmodule && syms_ss->symtab)
816 symbols__delete(&dso->symbols[map->type]);
818 if (!syms_ss->symtab) {
820 * If the vmlinux is stripped, fail so we will fall back
821 * to using kallsyms. The vmlinux runtime symbols aren't
827 syms_ss->symtab = syms_ss->dynsym;
828 syms_ss->symshdr = syms_ss->dynshdr;
832 ehdr = syms_ss->ehdr;
833 sec = syms_ss->symtab;
834 shdr = syms_ss->symshdr;
836 if (elf_section_by_name(elf, &ehdr, &tshdr, ".text", NULL))
837 dso->text_offset = tshdr.sh_addr - tshdr.sh_offset;
839 if (runtime_ss->opdsec)
840 opddata = elf_rawdata(runtime_ss->opdsec, NULL);
842 syms = elf_getdata(sec, NULL);
846 sec = elf_getscn(elf, shdr.sh_link);
850 symstrs = elf_getdata(sec, NULL);
854 sec_strndx = elf_getscn(runtime_ss->elf, runtime_ss->ehdr.e_shstrndx);
855 if (sec_strndx == NULL)
858 secstrs = elf_getdata(sec_strndx, NULL);
862 nr_syms = shdr.sh_size / shdr.sh_entsize;
864 memset(&sym, 0, sizeof(sym));
867 * The kernel relocation symbol is needed in advance in order to adjust
868 * kernel maps correctly.
870 if (ref_reloc_sym_not_found(kmap)) {
871 elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
872 const char *elf_name = elf_sym__name(&sym, symstrs);
874 if (strcmp(elf_name, kmap->ref_reloc_sym->name))
876 kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
877 map->reloc = kmap->ref_reloc_sym->addr -
878 kmap->ref_reloc_sym->unrelocated_addr;
884 * Handle any relocation of vdso necessary because older kernels
885 * attempted to prelink vdso to its virtual address.
887 if (dso__is_vdso(dso))
888 map->reloc = map->start - dso->text_offset;
890 dso->adjust_symbols = runtime_ss->adjust_symbols || ref_reloc(kmap);
892 * Initial kernel and module mappings do not map to the dso. For
893 * function mappings, flag the fixups.
895 if (map->type == MAP__FUNCTION && (dso->kernel || kmodule)) {
897 adjust_kernel_syms = dso->adjust_symbols;
899 elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
901 const char *elf_name = elf_sym__name(&sym, symstrs);
902 char *demangled = NULL;
903 int is_label = elf_sym__is_label(&sym);
904 const char *section_name;
905 bool used_opd = false;
907 if (!is_label && !elf_sym__is_a(&sym, map->type))
910 /* Reject ARM ELF "mapping symbols": these aren't unique and
911 * don't identify functions, so will confuse the profile
913 if (ehdr.e_machine == EM_ARM || ehdr.e_machine == EM_AARCH64) {
914 if (elf_name[0] == '$' && strchr("adtx", elf_name[1])
915 && (elf_name[2] == '\0' || elf_name[2] == '.'))
919 if (runtime_ss->opdsec && sym.st_shndx == runtime_ss->opdidx) {
920 u32 offset = sym.st_value - syms_ss->opdshdr.sh_addr;
921 u64 *opd = opddata->d_buf + offset;
922 sym.st_value = DSO__SWAP(dso, u64, *opd);
923 sym.st_shndx = elf_addr_to_index(runtime_ss->elf,
928 * When loading symbols in a data mapping, ABS symbols (which
929 * has a value of SHN_ABS in its st_shndx) failed at
930 * elf_getscn(). And it marks the loading as a failure so
931 * already loaded symbols cannot be fixed up.
933 * I'm not sure what should be done. Just ignore them for now.
936 if (sym.st_shndx == SHN_ABS)
939 sec = elf_getscn(runtime_ss->elf, sym.st_shndx);
943 gelf_getshdr(sec, &shdr);
945 if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
948 section_name = elf_sec__name(&shdr, secstrs);
950 /* On ARM, symbols for thumb functions have 1 added to
951 * the symbol address as a flag - remove it */
952 if ((ehdr.e_machine == EM_ARM) &&
953 (map->type == MAP__FUNCTION) &&
957 arch__elf_sym_adjust(&sym);
959 if (dso->kernel || kmodule) {
960 char dso_name[PATH_MAX];
962 /* Adjust symbol to map to file offset */
963 if (adjust_kernel_syms)
964 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
966 if (strcmp(section_name,
967 (curr_dso->short_name +
968 dso->short_name_len)) == 0)
971 if (strcmp(section_name, ".text") == 0) {
973 * The initial kernel mapping is based on
974 * kallsyms and identity maps. Overwrite it to
975 * map to the kernel dso.
977 if (remap_kernel && dso->kernel) {
978 remap_kernel = false;
979 map->start = shdr.sh_addr +
981 map->end = map->start + shdr.sh_size;
982 map->pgoff = shdr.sh_offset;
983 map->map_ip = map__map_ip;
984 map->unmap_ip = map__unmap_ip;
985 /* Ensure maps are correctly ordered */
988 map_groups__remove(kmaps, map);
989 map_groups__insert(kmaps, map);
995 * The initial module mapping is based on
996 * /proc/modules mapped to offset zero.
997 * Overwrite it to map to the module dso.
999 if (remap_kernel && kmodule) {
1000 remap_kernel = false;
1001 map->pgoff = shdr.sh_offset;
1012 snprintf(dso_name, sizeof(dso_name),
1013 "%s%s", dso->short_name, section_name);
1015 curr_map = map_groups__find_by_name(kmaps, map->type, dso_name);
1016 if (curr_map == NULL) {
1017 u64 start = sym.st_value;
1020 start += map->start + shdr.sh_offset;
1022 curr_dso = dso__new(dso_name);
1023 if (curr_dso == NULL)
1025 curr_dso->kernel = dso->kernel;
1026 curr_dso->long_name = dso->long_name;
1027 curr_dso->long_name_len = dso->long_name_len;
1028 curr_map = map__new2(start, curr_dso,
1031 if (curr_map == NULL) {
1034 if (adjust_kernel_syms) {
1035 curr_map->start = shdr.sh_addr +
1037 curr_map->end = curr_map->start +
1039 curr_map->pgoff = shdr.sh_offset;
1041 curr_map->map_ip = identity__map_ip;
1042 curr_map->unmap_ip = identity__map_ip;
1044 curr_dso->symtab_type = dso->symtab_type;
1045 map_groups__insert(kmaps, curr_map);
1047 * Add it before we drop the referece to curr_map,
1048 * i.e. while we still are sure to have a reference
1049 * to this DSO via curr_map->dso.
1051 dsos__add(&map->groups->machine->dsos, curr_dso);
1052 /* kmaps already got it */
1054 dso__set_loaded(curr_dso, map->type);
1056 curr_dso = curr_map->dso;
1061 if ((used_opd && runtime_ss->adjust_symbols)
1062 || (!used_opd && syms_ss->adjust_symbols)) {
1063 pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
1064 "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
1065 (u64)sym.st_value, (u64)shdr.sh_addr,
1066 (u64)shdr.sh_offset);
1067 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
1071 * We need to figure out if the object was created from C++ sources
1072 * DWARF DW_compile_unit has this, but we don't always have access
1075 if (want_demangle(dso->kernel || kmodule)) {
1076 int demangle_flags = DMGL_NO_OPTS;
1078 demangle_flags = DMGL_PARAMS | DMGL_ANSI;
1080 demangled = bfd_demangle(NULL, elf_name, demangle_flags);
1081 if (demangled == NULL)
1082 demangled = java_demangle_sym(elf_name, JAVA_DEMANGLE_NORET);
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 if (filter && filter(curr_map, f))
1095 symbols__insert(&curr_dso->symbols[curr_map->type], f);
1101 * For misannotated, zeroed, ASM function sizes.
1104 if (!symbol_conf.allow_aliases)
1105 symbols__fixup_duplicate(&dso->symbols[map->type]);
1106 symbols__fixup_end(&dso->symbols[map->type]);
1109 * We need to fixup this here too because we create new
1110 * maps here, for things like vsyscall sections.
1112 __map_groups__fixup_end(kmaps, map->type);
1120 static int elf_read_maps(Elf *elf, bool exe, mapfn_t mapfn, void *data)
1127 if (elf_getphdrnum(elf, &phdrnum))
1130 for (i = 0; i < phdrnum; i++) {
1131 if (gelf_getphdr(elf, i, &phdr) == NULL)
1133 if (phdr.p_type != PT_LOAD)
1136 if (!(phdr.p_flags & PF_X))
1139 if (!(phdr.p_flags & PF_R))
1142 sz = min(phdr.p_memsz, phdr.p_filesz);
1145 err = mapfn(phdr.p_vaddr, sz, phdr.p_offset, data);
1152 int file__read_maps(int fd, bool exe, mapfn_t mapfn, void *data,
1158 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1163 *is_64_bit = (gelf_getclass(elf) == ELFCLASS64);
1165 err = elf_read_maps(elf, exe, mapfn, data);
1171 enum dso_type dso__type_fd(int fd)
1173 enum dso_type dso_type = DSO__TYPE_UNKNOWN;
1178 elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1183 if (ek != ELF_K_ELF)
1186 if (gelf_getclass(elf) == ELFCLASS64) {
1187 dso_type = DSO__TYPE_64BIT;
1191 if (gelf_getehdr(elf, &ehdr) == NULL)
1194 if (ehdr.e_machine == EM_X86_64)
1195 dso_type = DSO__TYPE_X32BIT;
1197 dso_type = DSO__TYPE_32BIT;
1204 static int copy_bytes(int from, off_t from_offs, int to, off_t to_offs, u64 len)
1209 char *buf = malloc(page_size);
1214 if (lseek(to, to_offs, SEEK_SET) != to_offs)
1217 if (lseek(from, from_offs, SEEK_SET) != from_offs)
1224 /* Use read because mmap won't work on proc files */
1225 r = read(from, buf, n);
1231 r = write(to, buf, n);
1252 static int kcore__open(struct kcore *kcore, const char *filename)
1256 kcore->fd = open(filename, O_RDONLY);
1257 if (kcore->fd == -1)
1260 kcore->elf = elf_begin(kcore->fd, ELF_C_READ, NULL);
1264 kcore->elfclass = gelf_getclass(kcore->elf);
1265 if (kcore->elfclass == ELFCLASSNONE)
1268 ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr);
1275 elf_end(kcore->elf);
1281 static int kcore__init(struct kcore *kcore, char *filename, int elfclass,
1284 kcore->elfclass = elfclass;
1287 kcore->fd = mkstemp(filename);
1289 kcore->fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400);
1290 if (kcore->fd == -1)
1293 kcore->elf = elf_begin(kcore->fd, ELF_C_WRITE, NULL);
1297 if (!gelf_newehdr(kcore->elf, elfclass))
1300 memset(&kcore->ehdr, 0, sizeof(GElf_Ehdr));
1305 elf_end(kcore->elf);
1312 static void kcore__close(struct kcore *kcore)
1314 elf_end(kcore->elf);
1318 static int kcore__copy_hdr(struct kcore *from, struct kcore *to, size_t count)
1320 GElf_Ehdr *ehdr = &to->ehdr;
1321 GElf_Ehdr *kehdr = &from->ehdr;
1323 memcpy(ehdr->e_ident, kehdr->e_ident, EI_NIDENT);
1324 ehdr->e_type = kehdr->e_type;
1325 ehdr->e_machine = kehdr->e_machine;
1326 ehdr->e_version = kehdr->e_version;
1329 ehdr->e_flags = kehdr->e_flags;
1330 ehdr->e_phnum = count;
1331 ehdr->e_shentsize = 0;
1333 ehdr->e_shstrndx = 0;
1335 if (from->elfclass == ELFCLASS32) {
1336 ehdr->e_phoff = sizeof(Elf32_Ehdr);
1337 ehdr->e_ehsize = sizeof(Elf32_Ehdr);
1338 ehdr->e_phentsize = sizeof(Elf32_Phdr);
1340 ehdr->e_phoff = sizeof(Elf64_Ehdr);
1341 ehdr->e_ehsize = sizeof(Elf64_Ehdr);
1342 ehdr->e_phentsize = sizeof(Elf64_Phdr);
1345 if (!gelf_update_ehdr(to->elf, ehdr))
1348 if (!gelf_newphdr(to->elf, count))
1354 static int kcore__add_phdr(struct kcore *kcore, int idx, off_t offset,
1359 .p_flags = PF_R | PF_W | PF_X,
1365 .p_align = page_size,
1368 if (!gelf_update_phdr(kcore->elf, idx, &phdr))
1374 static off_t kcore__write(struct kcore *kcore)
1376 return elf_update(kcore->elf, ELF_C_WRITE);
1385 struct kcore_copy_info {
1391 u64 last_module_symbol;
1392 struct phdr_data kernel_map;
1393 struct phdr_data modules_map;
1396 static int kcore_copy__process_kallsyms(void *arg, const char *name, char type,
1399 struct kcore_copy_info *kci = arg;
1401 if (!symbol_type__is_a(type, MAP__FUNCTION))
1404 if (strchr(name, '[')) {
1405 if (start > kci->last_module_symbol)
1406 kci->last_module_symbol = start;
1410 if (!kci->first_symbol || start < kci->first_symbol)
1411 kci->first_symbol = start;
1413 if (!kci->last_symbol || start > kci->last_symbol)
1414 kci->last_symbol = start;
1416 if (!strcmp(name, "_stext")) {
1421 if (!strcmp(name, "_etext")) {
1429 static int kcore_copy__parse_kallsyms(struct kcore_copy_info *kci,
1432 char kallsyms_filename[PATH_MAX];
1434 scnprintf(kallsyms_filename, PATH_MAX, "%s/kallsyms", dir);
1436 if (symbol__restricted_filename(kallsyms_filename, "/proc/kallsyms"))
1439 if (kallsyms__parse(kallsyms_filename, kci,
1440 kcore_copy__process_kallsyms) < 0)
1446 static int kcore_copy__process_modules(void *arg,
1447 const char *name __maybe_unused,
1450 struct kcore_copy_info *kci = arg;
1452 if (!kci->first_module || start < kci->first_module)
1453 kci->first_module = start;
1458 static int kcore_copy__parse_modules(struct kcore_copy_info *kci,
1461 char modules_filename[PATH_MAX];
1463 scnprintf(modules_filename, PATH_MAX, "%s/modules", dir);
1465 if (symbol__restricted_filename(modules_filename, "/proc/modules"))
1468 if (modules__parse(modules_filename, kci,
1469 kcore_copy__process_modules) < 0)
1475 static void kcore_copy__map(struct phdr_data *p, u64 start, u64 end, u64 pgoff,
1478 if (p->addr || s < start || s >= end)
1482 p->offset = (s - start) + pgoff;
1483 p->len = e < end ? e - s : end - s;
1486 static int kcore_copy__read_map(u64 start, u64 len, u64 pgoff, void *data)
1488 struct kcore_copy_info *kci = data;
1489 u64 end = start + len;
1491 kcore_copy__map(&kci->kernel_map, start, end, pgoff, kci->stext,
1494 kcore_copy__map(&kci->modules_map, start, end, pgoff, kci->first_module,
1495 kci->last_module_symbol);
1500 static int kcore_copy__read_maps(struct kcore_copy_info *kci, Elf *elf)
1502 if (elf_read_maps(elf, true, kcore_copy__read_map, kci) < 0)
1508 static int kcore_copy__calc_maps(struct kcore_copy_info *kci, const char *dir,
1511 if (kcore_copy__parse_kallsyms(kci, dir))
1514 if (kcore_copy__parse_modules(kci, dir))
1518 kci->stext = round_down(kci->stext, page_size);
1520 kci->stext = round_down(kci->first_symbol, page_size);
1523 kci->etext = round_up(kci->etext, page_size);
1524 } else if (kci->last_symbol) {
1525 kci->etext = round_up(kci->last_symbol, page_size);
1526 kci->etext += page_size;
1529 kci->first_module = round_down(kci->first_module, page_size);
1531 if (kci->last_module_symbol) {
1532 kci->last_module_symbol = round_up(kci->last_module_symbol,
1534 kci->last_module_symbol += page_size;
1537 if (!kci->stext || !kci->etext)
1540 if (kci->first_module && !kci->last_module_symbol)
1543 return kcore_copy__read_maps(kci, elf);
1546 static int kcore_copy__copy_file(const char *from_dir, const char *to_dir,
1549 char from_filename[PATH_MAX];
1550 char to_filename[PATH_MAX];
1552 scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name);
1553 scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name);
1555 return copyfile_mode(from_filename, to_filename, 0400);
1558 static int kcore_copy__unlink(const char *dir, const char *name)
1560 char filename[PATH_MAX];
1562 scnprintf(filename, PATH_MAX, "%s/%s", dir, name);
1564 return unlink(filename);
1567 static int kcore_copy__compare_fds(int from, int to)
1575 buf_from = malloc(page_size);
1576 buf_to = malloc(page_size);
1577 if (!buf_from || !buf_to)
1581 /* Use read because mmap won't work on proc files */
1582 ret = read(from, buf_from, page_size);
1591 if (readn(to, buf_to, len) != (int)len)
1594 if (memcmp(buf_from, buf_to, len))
1605 static int kcore_copy__compare_files(const char *from_filename,
1606 const char *to_filename)
1608 int from, to, err = -1;
1610 from = open(from_filename, O_RDONLY);
1614 to = open(to_filename, O_RDONLY);
1616 goto out_close_from;
1618 err = kcore_copy__compare_fds(from, to);
1626 static int kcore_copy__compare_file(const char *from_dir, const char *to_dir,
1629 char from_filename[PATH_MAX];
1630 char to_filename[PATH_MAX];
1632 scnprintf(from_filename, PATH_MAX, "%s/%s", from_dir, name);
1633 scnprintf(to_filename, PATH_MAX, "%s/%s", to_dir, name);
1635 return kcore_copy__compare_files(from_filename, to_filename);
1639 * kcore_copy - copy kallsyms, modules and kcore from one directory to another.
1640 * @from_dir: from directory
1641 * @to_dir: to directory
1643 * This function copies kallsyms, modules and kcore files from one directory to
1644 * another. kallsyms and modules are copied entirely. Only code segments are
1645 * copied from kcore. It is assumed that two segments suffice: one for the
1646 * kernel proper and one for all the modules. The code segments are determined
1647 * from kallsyms and modules files. The kernel map starts at _stext or the
1648 * lowest function symbol, and ends at _etext or the highest function symbol.
1649 * The module map starts at the lowest module address and ends at the highest
1650 * module symbol. Start addresses are rounded down to the nearest page. End
1651 * addresses are rounded up to the nearest page. An extra page is added to the
1652 * highest kernel symbol and highest module symbol to, hopefully, encompass that
1653 * symbol too. Because it contains only code sections, the resulting kcore is
1654 * unusual. One significant peculiarity is that the mapping (start -> pgoff)
1655 * is not the same for the kernel map and the modules map. That happens because
1656 * the data is copied adjacently whereas the original kcore has gaps. Finally,
1657 * kallsyms and modules files are compared with their copies to check that
1658 * modules have not been loaded or unloaded while the copies were taking place.
1660 * Return: %0 on success, %-1 on failure.
1662 int kcore_copy(const char *from_dir, const char *to_dir)
1665 struct kcore extract;
1667 int idx = 0, err = -1;
1668 off_t offset = page_size, sz, modules_offset = 0;
1669 struct kcore_copy_info kci = { .stext = 0, };
1670 char kcore_filename[PATH_MAX];
1671 char extract_filename[PATH_MAX];
1673 if (kcore_copy__copy_file(from_dir, to_dir, "kallsyms"))
1676 if (kcore_copy__copy_file(from_dir, to_dir, "modules"))
1677 goto out_unlink_kallsyms;
1679 scnprintf(kcore_filename, PATH_MAX, "%s/kcore", from_dir);
1680 scnprintf(extract_filename, PATH_MAX, "%s/kcore", to_dir);
1682 if (kcore__open(&kcore, kcore_filename))
1683 goto out_unlink_modules;
1685 if (kcore_copy__calc_maps(&kci, from_dir, kcore.elf))
1686 goto out_kcore_close;
1688 if (kcore__init(&extract, extract_filename, kcore.elfclass, false))
1689 goto out_kcore_close;
1691 if (!kci.modules_map.addr)
1694 if (kcore__copy_hdr(&kcore, &extract, count))
1695 goto out_extract_close;
1697 if (kcore__add_phdr(&extract, idx++, offset, kci.kernel_map.addr,
1698 kci.kernel_map.len))
1699 goto out_extract_close;
1701 if (kci.modules_map.addr) {
1702 modules_offset = offset + kci.kernel_map.len;
1703 if (kcore__add_phdr(&extract, idx, modules_offset,
1704 kci.modules_map.addr, kci.modules_map.len))
1705 goto out_extract_close;
1708 sz = kcore__write(&extract);
1709 if (sz < 0 || sz > offset)
1710 goto out_extract_close;
1712 if (copy_bytes(kcore.fd, kci.kernel_map.offset, extract.fd, offset,
1713 kci.kernel_map.len))
1714 goto out_extract_close;
1716 if (modules_offset && copy_bytes(kcore.fd, kci.modules_map.offset,
1717 extract.fd, modules_offset,
1718 kci.modules_map.len))
1719 goto out_extract_close;
1721 if (kcore_copy__compare_file(from_dir, to_dir, "modules"))
1722 goto out_extract_close;
1724 if (kcore_copy__compare_file(from_dir, to_dir, "kallsyms"))
1725 goto out_extract_close;
1730 kcore__close(&extract);
1732 unlink(extract_filename);
1734 kcore__close(&kcore);
1737 kcore_copy__unlink(to_dir, "modules");
1738 out_unlink_kallsyms:
1740 kcore_copy__unlink(to_dir, "kallsyms");
1745 int kcore_extract__create(struct kcore_extract *kce)
1748 struct kcore extract;
1750 int idx = 0, err = -1;
1751 off_t offset = page_size, sz;
1753 if (kcore__open(&kcore, kce->kcore_filename))
1756 strcpy(kce->extract_filename, PERF_KCORE_EXTRACT);
1757 if (kcore__init(&extract, kce->extract_filename, kcore.elfclass, true))
1758 goto out_kcore_close;
1760 if (kcore__copy_hdr(&kcore, &extract, count))
1761 goto out_extract_close;
1763 if (kcore__add_phdr(&extract, idx, offset, kce->addr, kce->len))
1764 goto out_extract_close;
1766 sz = kcore__write(&extract);
1767 if (sz < 0 || sz > offset)
1768 goto out_extract_close;
1770 if (copy_bytes(kcore.fd, kce->offs, extract.fd, offset, kce->len))
1771 goto out_extract_close;
1776 kcore__close(&extract);
1778 unlink(kce->extract_filename);
1780 kcore__close(&kcore);
1785 void kcore_extract__delete(struct kcore_extract *kce)
1787 unlink(kce->extract_filename);
1790 void symbol__elf_init(void)
1792 elf_version(EV_CURRENT);