diff options
author | Namhyung Kim <namhyung.kim@lge.com> | 2012-08-06 13:41:20 +0900 |
---|---|---|
committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-08-09 16:26:33 -0300 |
commit | e5a1845fc0aeca85c98115980c3531129f87e18d (patch) | |
tree | f67ec3bfc5dc9ae6e2d89ad9b6493a873d4c8652 /tools/perf/util/symbol.c | |
parent | 166ccc9c244828da9214a0e7ba4d5dde6a26dcc1 (diff) | |
download | lwn-e5a1845fc0aeca85c98115980c3531129f87e18d.tar.gz lwn-e5a1845fc0aeca85c98115980c3531129f87e18d.zip |
perf symbols: Split out util/symbol-elf.c
Factor out the dependency of ELF handling into separate symbol-elf.c
file. It is a preparation of building a minimalistic version perf tools
which doesn't depend on the elfutils.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1344228082-15569-3-git-send-email-namhyung@kernel.org
[ committer note: removed blank line at symbol-elf.c EOF ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/symbol.c')
-rw-r--r-- | tools/perf/util/symbol.c | 804 |
1 files changed, 7 insertions, 797 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index a61fec4518da..f02de8ac842d 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -15,8 +15,6 @@ #include "symbol.h" #include "strlist.h" -#include <libelf.h> -#include <gelf.h> #include <elf.h> #include <limits.h> #include <sys/utsname.h> @@ -25,15 +23,7 @@ #define KSYM_NAME_LEN 256 #endif -#ifndef NT_GNU_BUILD_ID -#define NT_GNU_BUILD_ID 3 -#endif - static void dso_cache__free(struct rb_root *root); -static bool dso__build_id_equal(const struct dso *dso, u8 *build_id); -static int elf_read_build_id(Elf *elf, void *bf, size_t size); -static void dsos__add(struct list_head *head, struct dso *dso); -static struct map *map__new2(u64 start, struct dso *dso, enum map_type type); static int dso__load_kernel_sym(struct dso *dso, struct map *map, symbol_filter_t filter); static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map, @@ -170,7 +160,7 @@ static int choose_best_symbol(struct symbol *syma, struct symbol *symb) return SYMBOL_B; } -static void symbols__fixup_duplicate(struct rb_root *symbols) +void symbols__fixup_duplicate(struct rb_root *symbols) { struct rb_node *nd; struct symbol *curr, *next; @@ -199,7 +189,7 @@ again: } } -static void symbols__fixup_end(struct rb_root *symbols) +void symbols__fixup_end(struct rb_root *symbols) { struct rb_node *nd, *prevnd = rb_first(symbols); struct symbol *curr, *prev; @@ -222,7 +212,7 @@ static void symbols__fixup_end(struct rb_root *symbols) curr->end = roundup(curr->start, 4096); } -static void __map_groups__fixup_end(struct map_groups *mg, enum map_type type) +void __map_groups__fixup_end(struct map_groups *mg, enum map_type type) { struct map *prev, *curr; struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]); @@ -252,8 +242,7 @@ static void map_groups__fixup_end(struct map_groups *mg) __map_groups__fixup_end(mg, i); } -static struct symbol *symbol__new(u64 start, u64 len, u8 binding, - const char *name) +struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name) { size_t namelen = strlen(name) + 1; struct symbol *sym = calloc(1, (symbol_conf.priv_size + @@ -390,7 +379,7 @@ void dso__set_build_id(struct dso *dso, void *build_id) dso->has_build_id = 1; } -static void symbols__insert(struct rb_root *symbols, struct symbol *sym) +void symbols__insert(struct rb_root *symbols, struct symbol *sym) { struct rb_node **p = &symbols->rb_node; struct rb_node *parent = NULL; @@ -904,561 +893,7 @@ out_failure: return -1; } -/** - * elf_symtab__for_each_symbol - iterate thru all the symbols - * - * @syms: struct elf_symtab instance to iterate - * @idx: uint32_t idx - * @sym: GElf_Sym iterator - */ -#define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \ - for (idx = 0, gelf_getsym(syms, idx, &sym);\ - idx < nr_syms; \ - idx++, gelf_getsym(syms, idx, &sym)) - -static inline uint8_t elf_sym__type(const GElf_Sym *sym) -{ - return GELF_ST_TYPE(sym->st_info); -} - -static inline int elf_sym__is_function(const GElf_Sym *sym) -{ - return elf_sym__type(sym) == STT_FUNC && - sym->st_name != 0 && - sym->st_shndx != SHN_UNDEF; -} - -static inline bool elf_sym__is_object(const GElf_Sym *sym) -{ - return elf_sym__type(sym) == STT_OBJECT && - sym->st_name != 0 && - sym->st_shndx != SHN_UNDEF; -} - -static inline int elf_sym__is_label(const GElf_Sym *sym) -{ - return elf_sym__type(sym) == STT_NOTYPE && - sym->st_name != 0 && - sym->st_shndx != SHN_UNDEF && - sym->st_shndx != SHN_ABS; -} - -static inline const char *elf_sec__name(const GElf_Shdr *shdr, - const Elf_Data *secstrs) -{ - return secstrs->d_buf + shdr->sh_name; -} - -static inline int elf_sec__is_text(const GElf_Shdr *shdr, - const Elf_Data *secstrs) -{ - return strstr(elf_sec__name(shdr, secstrs), "text") != NULL; -} - -static inline bool elf_sec__is_data(const GElf_Shdr *shdr, - const Elf_Data *secstrs) -{ - return strstr(elf_sec__name(shdr, secstrs), "data") != NULL; -} - -static inline const char *elf_sym__name(const GElf_Sym *sym, - const Elf_Data *symstrs) -{ - return symstrs->d_buf + sym->st_name; -} - -static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, - GElf_Shdr *shp, const char *name, - size_t *idx) -{ - Elf_Scn *sec = NULL; - size_t cnt = 1; - - while ((sec = elf_nextscn(elf, sec)) != NULL) { - char *str; - - gelf_getshdr(sec, shp); - str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name); - if (!strcmp(name, str)) { - if (idx) - *idx = cnt; - break; - } - ++cnt; - } - - return sec; -} - -#define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ - for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \ - idx < nr_entries; \ - ++idx, pos = gelf_getrel(reldata, idx, &pos_mem)) - -#define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \ - for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \ - idx < nr_entries; \ - ++idx, pos = gelf_getrela(reldata, idx, &pos_mem)) - -/* - * We need to check if we have a .dynsym, so that we can handle the - * .plt, synthesizing its symbols, that aren't on the symtabs (be it - * .dynsym or .symtab). - * And always look at the original dso, not at debuginfo packages, that - * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS). - */ -static int -dso__synthesize_plt_symbols(struct dso *dso, char *name, struct map *map, - symbol_filter_t filter) -{ - uint32_t nr_rel_entries, idx; - GElf_Sym sym; - u64 plt_offset; - GElf_Shdr shdr_plt; - struct symbol *f; - GElf_Shdr shdr_rel_plt, shdr_dynsym; - Elf_Data *reldata, *syms, *symstrs; - Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; - size_t dynsym_idx; - GElf_Ehdr ehdr; - char sympltname[1024]; - Elf *elf; - int nr = 0, symidx, fd, err = 0; - - fd = open(name, O_RDONLY); - if (fd < 0) - goto out; - - elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); - if (elf == NULL) - goto out_close; - - if (gelf_getehdr(elf, &ehdr) == NULL) - goto out_elf_end; - - scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym, - ".dynsym", &dynsym_idx); - if (scn_dynsym == NULL) - goto out_elf_end; - - scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, - ".rela.plt", NULL); - if (scn_plt_rel == NULL) { - scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt, - ".rel.plt", NULL); - if (scn_plt_rel == NULL) - goto out_elf_end; - } - - err = -1; - - if (shdr_rel_plt.sh_link != dynsym_idx) - goto out_elf_end; - - if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL) - goto out_elf_end; - - /* - * Fetch the relocation section to find the idxes to the GOT - * and the symbols in the .dynsym they refer to. - */ - reldata = elf_getdata(scn_plt_rel, NULL); - if (reldata == NULL) - goto out_elf_end; - - syms = elf_getdata(scn_dynsym, NULL); - if (syms == NULL) - goto out_elf_end; - - scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link); - if (scn_symstrs == NULL) - goto out_elf_end; - - symstrs = elf_getdata(scn_symstrs, NULL); - if (symstrs == NULL) - goto out_elf_end; - - nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize; - plt_offset = shdr_plt.sh_offset; - - if (shdr_rel_plt.sh_type == SHT_RELA) { - GElf_Rela pos_mem, *pos; - - elf_section__for_each_rela(reldata, pos, pos_mem, idx, - nr_rel_entries) { - symidx = GELF_R_SYM(pos->r_info); - plt_offset += shdr_plt.sh_entsize; - gelf_getsym(syms, symidx, &sym); - snprintf(sympltname, sizeof(sympltname), - "%s@plt", elf_sym__name(&sym, symstrs)); - - f = symbol__new(plt_offset, shdr_plt.sh_entsize, - STB_GLOBAL, sympltname); - if (!f) - goto out_elf_end; - - if (filter && filter(map, f)) - symbol__delete(f); - else { - symbols__insert(&dso->symbols[map->type], f); - ++nr; - } - } - } else if (shdr_rel_plt.sh_type == SHT_REL) { - GElf_Rel pos_mem, *pos; - elf_section__for_each_rel(reldata, pos, pos_mem, idx, - nr_rel_entries) { - symidx = GELF_R_SYM(pos->r_info); - plt_offset += shdr_plt.sh_entsize; - gelf_getsym(syms, symidx, &sym); - snprintf(sympltname, sizeof(sympltname), - "%s@plt", elf_sym__name(&sym, symstrs)); - - f = symbol__new(plt_offset, shdr_plt.sh_entsize, - STB_GLOBAL, sympltname); - if (!f) - goto out_elf_end; - - if (filter && filter(map, f)) - symbol__delete(f); - else { - symbols__insert(&dso->symbols[map->type], f); - ++nr; - } - } - } - - err = 0; -out_elf_end: - elf_end(elf); -out_close: - close(fd); - - if (err == 0) - return nr; -out: - pr_debug("%s: problems reading %s PLT info.\n", - __func__, dso->long_name); - return 0; -} - -static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type) -{ - switch (type) { - case MAP__FUNCTION: - return elf_sym__is_function(sym); - case MAP__VARIABLE: - return elf_sym__is_object(sym); - default: - return false; - } -} - -static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs, - enum map_type type) -{ - switch (type) { - case MAP__FUNCTION: - return elf_sec__is_text(shdr, secstrs); - case MAP__VARIABLE: - return elf_sec__is_data(shdr, secstrs); - default: - return false; - } -} - -static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr) -{ - Elf_Scn *sec = NULL; - GElf_Shdr shdr; - size_t cnt = 1; - - while ((sec = elf_nextscn(elf, sec)) != NULL) { - gelf_getshdr(sec, &shdr); - - if ((addr >= shdr.sh_addr) && - (addr < (shdr.sh_addr + shdr.sh_size))) - return cnt; - - ++cnt; - } - - return -1; -} - -static int dso__swap_init(struct dso *dso, unsigned char eidata) -{ - static unsigned int const endian = 1; - - dso->needs_swap = DSO_SWAP__NO; - - switch (eidata) { - case ELFDATA2LSB: - /* We are big endian, DSO is little endian. */ - if (*(unsigned char const *)&endian != 1) - dso->needs_swap = DSO_SWAP__YES; - break; - - case ELFDATA2MSB: - /* We are little endian, DSO is big endian. */ - if (*(unsigned char const *)&endian != 0) - dso->needs_swap = DSO_SWAP__YES; - break; - - default: - pr_err("unrecognized DSO data encoding %d\n", eidata); - return -EINVAL; - } - - return 0; -} - -static int dso__load_sym(struct dso *dso, struct map *map, const char *name, - int fd, symbol_filter_t filter, int kmodule, - int want_symtab) -{ - struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL; - struct map *curr_map = map; - struct dso *curr_dso = dso; - Elf_Data *symstrs, *secstrs; - uint32_t nr_syms; - int err = -1; - uint32_t idx; - GElf_Ehdr ehdr; - GElf_Shdr shdr, opdshdr; - Elf_Data *syms, *opddata = NULL; - GElf_Sym sym; - Elf_Scn *sec, *sec_strndx, *opdsec; - Elf *elf; - int nr = 0; - size_t opdidx = 0; - - elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); - if (elf == NULL) { - pr_debug("%s: cannot read %s ELF file.\n", __func__, name); - goto out_close; - } - - if (gelf_getehdr(elf, &ehdr) == NULL) { - pr_debug("%s: cannot get elf header.\n", __func__); - goto out_elf_end; - } - - if (dso__swap_init(dso, ehdr.e_ident[EI_DATA])) - goto out_elf_end; - - /* Always reject images with a mismatched build-id: */ - if (dso->has_build_id) { - u8 build_id[BUILD_ID_SIZE]; - - if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0) - goto out_elf_end; - - if (!dso__build_id_equal(dso, build_id)) - goto out_elf_end; - } - - sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL); - if (sec == NULL) { - if (want_symtab) - goto out_elf_end; - - sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL); - if (sec == NULL) - goto out_elf_end; - } - - opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx); - if (opdshdr.sh_type != SHT_PROGBITS) - opdsec = NULL; - if (opdsec) - opddata = elf_rawdata(opdsec, NULL); - - syms = elf_getdata(sec, NULL); - if (syms == NULL) - goto out_elf_end; - - sec = elf_getscn(elf, shdr.sh_link); - if (sec == NULL) - goto out_elf_end; - - symstrs = elf_getdata(sec, NULL); - if (symstrs == NULL) - goto out_elf_end; - - sec_strndx = elf_getscn(elf, ehdr.e_shstrndx); - if (sec_strndx == NULL) - goto out_elf_end; - - secstrs = elf_getdata(sec_strndx, NULL); - if (secstrs == NULL) - goto out_elf_end; - - nr_syms = shdr.sh_size / shdr.sh_entsize; - - memset(&sym, 0, sizeof(sym)); - if (dso->kernel == DSO_TYPE_USER) { - dso->adjust_symbols = (ehdr.e_type == ET_EXEC || - elf_section_by_name(elf, &ehdr, &shdr, - ".gnu.prelink_undo", - NULL) != NULL); - } else { - dso->adjust_symbols = 0; - } - elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) { - struct symbol *f; - const char *elf_name = elf_sym__name(&sym, symstrs); - char *demangled = NULL; - int is_label = elf_sym__is_label(&sym); - const char *section_name; - - if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name && - strcmp(elf_name, kmap->ref_reloc_sym->name) == 0) - kmap->ref_reloc_sym->unrelocated_addr = sym.st_value; - - if (!is_label && !elf_sym__is_a(&sym, map->type)) - continue; - - /* Reject ARM ELF "mapping symbols": these aren't unique and - * don't identify functions, so will confuse the profile - * output: */ - if (ehdr.e_machine == EM_ARM) { - if (!strcmp(elf_name, "$a") || - !strcmp(elf_name, "$d") || - !strcmp(elf_name, "$t")) - continue; - } - - if (opdsec && sym.st_shndx == opdidx) { - u32 offset = sym.st_value - opdshdr.sh_addr; - u64 *opd = opddata->d_buf + offset; - sym.st_value = DSO__SWAP(dso, u64, *opd); - sym.st_shndx = elf_addr_to_index(elf, sym.st_value); - } - - sec = elf_getscn(elf, sym.st_shndx); - if (!sec) - goto out_elf_end; - - gelf_getshdr(sec, &shdr); - - if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type)) - continue; - - section_name = elf_sec__name(&shdr, secstrs); - - /* On ARM, symbols for thumb functions have 1 added to - * the symbol address as a flag - remove it */ - if ((ehdr.e_machine == EM_ARM) && - (map->type == MAP__FUNCTION) && - (sym.st_value & 1)) - --sym.st_value; - - if (dso->kernel != DSO_TYPE_USER || kmodule) { - char dso_name[PATH_MAX]; - - if (strcmp(section_name, - (curr_dso->short_name + - dso->short_name_len)) == 0) - goto new_symbol; - - if (strcmp(section_name, ".text") == 0) { - curr_map = map; - curr_dso = dso; - goto new_symbol; - } - - snprintf(dso_name, sizeof(dso_name), - "%s%s", dso->short_name, section_name); - - curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name); - if (curr_map == NULL) { - u64 start = sym.st_value; - - if (kmodule) - start += map->start + shdr.sh_offset; - - curr_dso = dso__new(dso_name); - if (curr_dso == NULL) - goto out_elf_end; - curr_dso->kernel = dso->kernel; - curr_dso->long_name = dso->long_name; - curr_dso->long_name_len = dso->long_name_len; - curr_map = map__new2(start, curr_dso, - map->type); - if (curr_map == NULL) { - dso__delete(curr_dso); - goto out_elf_end; - } - curr_map->map_ip = identity__map_ip; - curr_map->unmap_ip = identity__map_ip; - curr_dso->symtab_type = dso->symtab_type; - map_groups__insert(kmap->kmaps, curr_map); - dsos__add(&dso->node, curr_dso); - dso__set_loaded(curr_dso, map->type); - } else - curr_dso = curr_map->dso; - - goto new_symbol; - } - - if (curr_dso->adjust_symbols) { - pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " " - "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__, - (u64)sym.st_value, (u64)shdr.sh_addr, - (u64)shdr.sh_offset); - sym.st_value -= shdr.sh_addr - shdr.sh_offset; - } - /* - * We need to figure out if the object was created from C++ sources - * DWARF DW_compile_unit has this, but we don't always have access - * to it... - */ - demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI); - if (demangled != NULL) - elf_name = demangled; -new_symbol: - f = symbol__new(sym.st_value, sym.st_size, - GELF_ST_BIND(sym.st_info), elf_name); - free(demangled); - if (!f) - goto out_elf_end; - - if (filter && filter(curr_map, f)) - symbol__delete(f); - else { - symbols__insert(&curr_dso->symbols[curr_map->type], f); - nr++; - } - } - - /* - * For misannotated, zeroed, ASM function sizes. - */ - if (nr > 0) { - symbols__fixup_duplicate(&dso->symbols[map->type]); - symbols__fixup_end(&dso->symbols[map->type]); - if (kmap) { - /* - * We need to fixup this here too because we create new - * maps here, for things like vsyscall sections. - */ - __map_groups__fixup_end(kmap->kmaps, map->type); - } - } - err = nr; -out_elf_end: - elf_end(elf); -out_close: - return err; -} - -void symbol__elf_init(void) -{ - elf_version(EV_CURRENT); -} - -static bool dso__build_id_equal(const struct dso *dso, u8 *build_id) +bool dso__build_id_equal(const struct dso *dso, u8 *build_id) { return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0; } @@ -1485,212 +920,6 @@ bool __dsos__read_build_ids(struct list_head *head, bool with_hits) return have_build_id; } -/* - * Align offset to 4 bytes as needed for note name and descriptor data. - */ -#define NOTE_ALIGN(n) (((n) + 3) & -4U) - -static int elf_read_build_id(Elf *elf, void *bf, size_t size) -{ - int err = -1; - GElf_Ehdr ehdr; - GElf_Shdr shdr; - Elf_Data *data; - Elf_Scn *sec; - Elf_Kind ek; - void *ptr; - - if (size < BUILD_ID_SIZE) - goto out; - - ek = elf_kind(elf); - if (ek != ELF_K_ELF) - goto out; - - if (gelf_getehdr(elf, &ehdr) == NULL) { - pr_err("%s: cannot get elf header.\n", __func__); - goto out; - } - - /* - * Check following sections for notes: - * '.note.gnu.build-id' - * '.notes' - * '.note' (VDSO specific) - */ - do { - sec = elf_section_by_name(elf, &ehdr, &shdr, - ".note.gnu.build-id", NULL); - if (sec) - break; - - sec = elf_section_by_name(elf, &ehdr, &shdr, - ".notes", NULL); - if (sec) - break; - - sec = elf_section_by_name(elf, &ehdr, &shdr, - ".note", NULL); - if (sec) - break; - - return err; - - } while (0); - - data = elf_getdata(sec, NULL); - if (data == NULL) - goto out; - - ptr = data->d_buf; - while (ptr < (data->d_buf + data->d_size)) { - GElf_Nhdr *nhdr = ptr; - size_t namesz = NOTE_ALIGN(nhdr->n_namesz), - descsz = NOTE_ALIGN(nhdr->n_descsz); - const char *name; - - ptr += sizeof(*nhdr); - name = ptr; - ptr += namesz; - if (nhdr->n_type == NT_GNU_BUILD_ID && - nhdr->n_namesz == sizeof("GNU")) { - if (memcmp(name, "GNU", sizeof("GNU")) == 0) { - size_t sz = min(size, descsz); - memcpy(bf, ptr, sz); - memset(bf + sz, 0, size - sz); - err = descsz; - break; - } - } - ptr += descsz; - } - -out: - return err; -} - -int filename__read_build_id(const char *filename, void *bf, size_t size) -{ - int fd, err = -1; - Elf *elf; - - if (size < BUILD_ID_SIZE) - goto out; - - fd = open(filename, O_RDONLY); - if (fd < 0) - goto out; - - elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); - if (elf == NULL) { - pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); - goto out_close; - } - - err = elf_read_build_id(elf, bf, size); - - elf_end(elf); -out_close: - close(fd); -out: - return err; -} - -int sysfs__read_build_id(const char *filename, void *build_id, size_t size) -{ - int fd, err = -1; - - if (size < BUILD_ID_SIZE) - goto out; - - fd = open(filename, O_RDONLY); - if (fd < 0) - goto out; - - while (1) { - char bf[BUFSIZ]; - GElf_Nhdr nhdr; - size_t namesz, descsz; - - if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr)) - break; - - namesz = NOTE_ALIGN(nhdr.n_namesz); - descsz = NOTE_ALIGN(nhdr.n_descsz); - if (nhdr.n_type == NT_GNU_BUILD_ID && - nhdr.n_namesz == sizeof("GNU")) { - if (read(fd, bf, namesz) != (ssize_t)namesz) - break; - if (memcmp(bf, "GNU", sizeof("GNU")) == 0) { - size_t sz = min(descsz, size); - if (read(fd, build_id, sz) == (ssize_t)sz) { - memset(build_id + sz, 0, size - sz); - err = 0; - break; - } - } else if (read(fd, bf, descsz) != (ssize_t)descsz) - break; - } else { - int n = namesz + descsz; - if (read(fd, bf, n) != n) - break; - } - } - close(fd); -out: - return err; -} - -static int filename__read_debuglink(const char *filename, - char *debuglink, size_t size) -{ - int fd, err = -1; - Elf *elf; - GElf_Ehdr ehdr; - GElf_Shdr shdr; - Elf_Data *data; - Elf_Scn *sec; - Elf_Kind ek; - - fd = open(filename, O_RDONLY); - if (fd < 0) - goto out; - - elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); - if (elf == NULL) { - pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename); - goto out_close; - } - - ek = elf_kind(elf); - if (ek != ELF_K_ELF) - goto out_close; - - if (gelf_getehdr(elf, &ehdr) == NULL) { - pr_err("%s: cannot get elf header.\n", __func__); - goto out_close; - } - - sec = elf_section_by_name(elf, &ehdr, &shdr, - ".gnu_debuglink", NULL); - if (sec == NULL) - goto out_close; - - data = elf_getdata(sec, NULL); - if (data == NULL) - goto out_close; - - /* the start of this section is a zero-terminated string */ - strncpy(debuglink, data->d_buf, size); - - elf_end(elf); - -out_close: - close(fd); -out: - return err; -} - char dso__symtab_origin(const struct dso *dso) { static const char origin[] = { @@ -2035,25 +1264,6 @@ static int machine__set_modules_path(struct machine *machine) return map_groups__set_modules_path_dir(&machine->kmaps, modules_path); } -/* - * Constructor variant for modules (where we know from /proc/modules where - * they are loaded) and for vmlinux, where only after we load all the - * symbols we'll know where it starts and ends. - */ -static struct map *map__new2(u64 start, struct dso *dso, enum map_type type) -{ - struct map *map = calloc(1, (sizeof(*map) + - (dso->kernel ? sizeof(struct kmap) : 0))); - if (map != NULL) { - /* - * ->end will be filled after we load all the symbols - */ - map__init(map, type, start, 0, 0, dso); - } - - return map; -} - struct map *machine__new_module(struct machine *machine, u64 start, const char *filename) { @@ -2357,7 +1567,7 @@ out_try_fixup: return err; } -static void dsos__add(struct list_head *head, struct dso *dso) +void dsos__add(struct list_head *head, struct dso *dso) { list_add_tail(&dso->node, head); } |