perf/util/symbol-elf.c

68 static int elf_getphdrnum(Elf *elf, size_t *dst)
73 	ehdr = gelf_getehdr(elf, &gehdr);
84 static int elf_getshdrstrndx(Elf *elf __maybe_unused, size_t *dst __maybe_unused)
181 static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
187 	while ((sec = elf_nextscn(elf, sec)) != NULL) {
200 Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
207 	if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL))
210 	while ((sec = elf_nextscn(elf, sec)) != NULL) {
214 		str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
229 	Elf *elf;
238 	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
239 	if (elf == NULL)
242 	if (gelf_getehdr(elf, &ehdr) == NULL)
245 	found = !!elf_section_by_name(elf, &ehdr, &shdr, sec, NULL);
248 	elf_end(elf);
254 static int elf_read_program_header(Elf *elf, u64 vaddr, GElf_Phdr *phdr)
259 	if (elf_getphdrnum(elf, &phdrnum))
263 		if (gelf_getphdr(elf, i, phdr) == NULL)
403 static bool get_ifunc_name(Elf *elf, struct dso *dso, GElf_Ehdr *ehdr,
413 	if (elf_read_program_header(elf, addr, &phdr))
539 static void get_rela_dyn_info(Elf *elf, GElf_Ehdr *ehdr, struct rela_dyn_info *di, Elf_Scn *scn)
546 	scn = elf_section_by_name(elf, ehdr, &rela_dyn_shdr, ".rela.dyn", NULL);
553 	scn = elf_getscn(elf, rela_dyn_shdr.sh_link);
558 	di->dynstr_data = elf_getdata(elf_getscn(elf, shdr.sh_link), NULL);
633 static int dso__synthesize_plt_got_symbols(struct dso *dso, Elf *elf,
644 	scn = elf_section_by_name(elf, ehdr, &shdr, ".plt.got", NULL);
649 		get_rela_dyn_info(elf, ehdr, &di, scn);
684 	Elf *elf;
689 	elf = ss->elf;
692 	if (!elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL))
715 	    dso__synthesize_plt_got_symbols(dso, elf, &ehdr, sympltname, sizeof(sympltname)))
720 	    elf_section_by_name(elf, &ehdr, &plt_sec_shdr, ".plt.sec", NULL)) {
733 	scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
736 		scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
778 	scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
823 		else if (!get_ifunc_name(elf, dso, &ehdr, &ri, sympltname, sizeof(sympltname)))
857 static int elf_read_build_id(Elf *elf, void *bf, size_t size)
870 	ek = elf_kind(elf);
874 	if (gelf_getehdr(elf, &ehdr) == NULL) {
875 		pr_err("%s: cannot get elf header.\n", __func__);
886 		sec = elf_section_by_name(elf, &ehdr, &shdr,
891 		sec = elf_section_by_name(elf, &ehdr, &shdr,
896 		sec = elf_section_by_name(elf, &ehdr, &shdr,
971 	Elf *elf;
980 	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
981 	if (elf == NULL) {
986 	err = elf_read_build_id(elf, bid->data, size);
990 	elf_end(elf);
1124 	Elf *elf;
1135 	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1136 	if (elf == NULL) {
1141 	ek = elf_kind(elf);
1145 	if (gelf_getehdr(elf, &ehdr) == NULL) {
1146 		pr_err("%s: cannot get elf header.\n", __func__);
1150 	sec = elf_section_by_name(elf, &ehdr, &shdr,
1165 	elf_end(elf);
1214 	elf_end(ss->elf);
1233 	Elf *elf;
1250 	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1251 	if (elf == NULL) {
1257 	if (gelf_getehdr(elf, &ehdr) == NULL) {
1259 		pr_debug("%s: cannot get elf header.\n", __func__);
1274 		size = elf_read_build_id(elf, build_id, BUILD_ID_SIZE);
1288 	ss->is_64_bit = (gelf_getclass(elf) == ELFCLASS64);
1291 	ss->symtab = elf_section_by_name(elf, &ehdr, &ss->symshdr, ".symtab",
1297 	ss->dynsym = elf_section_by_name(elf, &ehdr, &ss->dynshdr, ".dynsym",
1303 	ss->opdsec = elf_section_by_name(elf, &ehdr, &ss->opdshdr, ".opd",
1319 	ss->elf    = elf;
1327 	elf_end(elf);
1344 static u64 max_text_section(Elf *elf, GElf_Ehdr *ehdr)
1356 	if (!elf_rawdata(elf_getscn(elf, ehdr->e_shstrndx), NULL))
1359 	while ((sec = elf_nextscn(elf, sec)) != NULL) {
1369 		sec_name = elf_strptr(elf, ehdr->e_shstrndx, shdr.sh_name);
1564 	Elf *elf;
1572 	elf = syms_ss->elf;
1582 	if (elf_section_by_name(runtime_ss->elf, &runtime_ss->ehdr, &tshdr,
1595 	sec = elf_getscn(elf, shdr.sh_link);
1603 	sec_strndx = elf_getscn(runtime_ss->elf, runtime_ss->ehdr.e_shstrndx);
1611 	sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
1657 		max_text_sh_offset = max_text_section(runtime_ss->elf, &runtime_ss->ehdr);
1683 			sym.st_shndx = elf_addr_to_index(runtime_ss->elf,
1700 		sec = elf_getscn(syms_ss->elf, sym.st_shndx);
1726 			sec = elf_getscn(runtime_ss->elf, sym.st_shndx);
1755 			if (elf_read_program_header(runtime_ss->elf,
1862 static int elf_read_maps(Elf *elf, bool exe, mapfn_t mapfn, void *data)
1869 	if (elf_getphdrnum(elf, &phdrnum))
1873 		if (gelf_getphdr(elf, i, &phdr) == NULL)
1898 	Elf *elf;
1900 	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1901 	if (elf == NULL)
1905 		*is_64_bit = (gelf_getclass(elf) == ELFCLASS64);
1907 	err = elf_read_maps(elf, exe, mapfn, data);
1909 	elf_end(elf);
1918 	Elf *elf;
1920 	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
1921 	if (elf == NULL)
1924 	ek = elf_kind(elf);
1928 	if (gelf_getclass(elf) == ELFCLASS64) {
1933 	if (gelf_getehdr(elf, &ehdr) == NULL)
1941 	elf_end(elf);
1990 	Elf *elf;
2002 	kcore->elf = elf_begin(kcore->fd, ELF_C_READ, NULL);
2003 	if (!kcore->elf)
2006 	kcore->elfclass = gelf_getclass(kcore->elf);
2010 	ehdr = gelf_getehdr(kcore->elf, &kcore->ehdr);
2017 	elf_end(kcore->elf);
2035 	kcore->elf = elf_begin(kcore->fd, ELF_C_WRITE, NULL);
2036 	if (!kcore->elf)
2039 	if (!gelf_newehdr(kcore->elf, elfclass))
2047 	elf_end(kcore->elf);
2056 	elf_end(kcore->elf);
2087 	if (!gelf_update_ehdr(to->elf, ehdr))
2090 	if (!gelf_newphdr(to->elf, count))
2110 	if (!gelf_update_phdr(kcore->elf, idx, &phdr))
2118 	return elf_update(kcore->elf, ELF_C_WRITE);
2330 static int kcore_copy__read_maps(struct kcore_copy_info *kci, Elf *elf)
2332 	if (elf_read_maps(elf, true, kcore_copy__read_map, kci) < 0)
2397 				 Elf *elf)
2435 	if (kcore_copy__read_maps(kci, elf))
2585 	if (kcore_copy__calc_maps(&kci, from_dir, kcore.elf))
2594 	offset = gelf_fsize(extract.elf, ELF_T_EHDR, 1, EV_CURRENT) +
2595 		 gelf_fsize(extract.elf, ELF_T_PHDR, kci.phnum, EV_CURRENT);
2718  * @elf: elf of the opened file
2724  * Responsible for parsing the @data in section .note.stapsdt in @elf and
2727 static int populate_sdt_note(Elf **elf, const char *data, size_t len,
2743 		.d_size = gelf_fsize((*elf), ELF_T_ADDR, NR_ADDR, EV_CURRENT),
2764 	if (gelf_xlatetom(*elf, &dst, &src,
2765 			  elf_getident(*elf, NULL)[EI_DATA]) == NULL) {
2807 	if (gelf_getclass(*elf) == ELFCLASS32) {
2815 	if (!gelf_getehdr(*elf, &ehdr)) {
2816 		pr_debug("%s : cannot get elf header.\n", __func__);
2828 	if (elf_section_by_name(*elf, &ehdr, &shdr, SDT_BASE_SCN, NULL))
2832 	if (elf_section_by_name(*elf, &ehdr, &shdr, SDT_PROBES_SCN, NULL))
2852  * @elf : elf to look into
2855  * Scans the sections in 'elf' for the section
2859 static int construct_sdt_notes_list(Elf *elf, struct list_head *sdt_notes)
2870 	if (gelf_getehdr(elf, &ehdr) == NULL) {
2874 	if (elf_getshdrstrndx(elf, &shstrndx) != 0) {
2880 	scn = elf_section_by_name(elf, &ehdr, &shdr, SDT_NOTE_SCN, NULL);
2903 			ret = populate_sdt_note(&elf, ((data->d_buf) + desc_off),
2926 	Elf *elf;
2933 	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
2934 	if (!elf) {
2938 	ret = construct_sdt_notes_list(elf, head);
2939 	elf_end(elf);