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Date: Fri, 6 Jul 2012 16:21:35 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Paul Mackerras <paulus@...ba.org>,
Ingo Molnar <mingo@...nel.org>,
LKML <linux-kernel@...r.kernel.org>,
Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
Namhyung Kim <namhyung.kim@....com>
Subject: [PATCH 4/6] perf tools: Split out util/symbol-elf.c
From: Namhyung Kim <namhyung.kim@....com>
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@...nel.org>
---
tools/perf/Makefile | 1 +
tools/perf/util/map.c | 19 +
tools/perf/util/map.h | 1 +
tools/perf/util/symbol-elf.c | 775 ++++++++++++++++++++++++++++++++++++++++
tools/perf/util/symbol.c | 804 +-----------------------------------------
tools/perf/util/symbol.h | 15 +
6 files changed, 818 insertions(+), 797 deletions(-)
create mode 100644 tools/perf/util/symbol-elf.c
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 75d74e5db8d5..c2d924b31033 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -354,6 +354,7 @@ LIB_OBJS += $(OUTPUT)util/usage.o
LIB_OBJS += $(OUTPUT)util/wrapper.o
LIB_OBJS += $(OUTPUT)util/sigchain.o
LIB_OBJS += $(OUTPUT)util/symbol.o
+LIB_OBJS += $(OUTPUT)util/symbol-elf.o
LIB_OBJS += $(OUTPUT)util/color.o
LIB_OBJS += $(OUTPUT)util/pager.o
LIB_OBJS += $(OUTPUT)util/header.o
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 35ae56864e4f..562a06af8658 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -84,6 +84,25 @@ out_delete:
return NULL;
}
+/*
+ * 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.
+ */
+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;
+}
+
void map__delete(struct map *self)
{
free(self);
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index c14c665d9a25..ef29ba6e93e0 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -115,6 +115,7 @@ void map__init(struct map *self, enum map_type type,
struct map *map__new(struct list_head *dsos__list, u64 start, u64 len,
u64 pgoff, u32 pid, char *filename,
enum map_type type);
+struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
void map__delete(struct map *self);
struct map *map__clone(struct map *self);
int map__overlap(struct map *l, struct map *r);
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
new file mode 100644
index 000000000000..753e56e7fe93
--- /dev/null
+++ b/tools/perf/util/symbol-elf.c
@@ -0,0 +1,775 @@
+#include <libelf.h>
+#include <gelf.h>
+#include <elf.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <inttypes.h>
+
+#include "symbol.h"
+#include "debug.h"
+
+#ifndef NT_GNU_BUILD_ID
+#define NT_GNU_BUILD_ID 3
+#endif
+
+/**
+ * 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 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 inline const char *elf_sym__name(const GElf_Sym *sym,
+ const Elf_Data *symstrs)
+{
+ return symstrs->d_buf + sym->st_name;
+}
+
+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 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 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).
+ */
+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;
+}
+
+/*
+ * 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;
+}
+
+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;
+}
+
+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;
+}
+
+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);
+}
+
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index ab22895482de..098fee475635 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>
@@ -25,14 +23,6 @@
#define KSYM_NAME_LEN 256
#endif
-#ifndef NT_GNU_BUILD_ID
-#define NT_GNU_BUILD_ID 3
-#endif
-
-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,
@@ -144,7 +134,7 @@ 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;
@@ -173,7 +163,7 @@ 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;
@@ -196,7 +186,7 @@ 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]);
@@ -226,8 +216,7 @@ 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 +
@@ -361,7 +350,7 @@ 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;
@@ -875,561 +864,7 @@ 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;
}
@@ -1456,212 +891,6 @@ 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[] = {
@@ -1982,25 +1211,6 @@ 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)
{
@@ -2304,7 +1514,7 @@ 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);
}
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 9006b548546e..41f3c9ca87e8 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -227,6 +227,7 @@ static inline void dso__set_loaded(struct dso *dso, enum map_type type)
void dso__sort_by_name(struct dso *dso, enum map_type type);
+void dsos__add(struct list_head *head, struct dso *dso);
struct dso *__dsos__findnew(struct list_head *head, const char *name);
int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter);
@@ -271,6 +272,7 @@ enum symtab_type {
char dso__symtab_origin(const struct dso *dso);
void dso__set_long_name(struct dso *dso, char *name);
void dso__set_build_id(struct dso *dso, void *build_id);
+bool dso__build_id_equal(const struct dso *dso, u8 *build_id);
void dso__read_running_kernel_build_id(struct dso *dso,
struct machine *machine);
struct map *dso__new_map(const char *name);
@@ -286,6 +288,8 @@ int build_id__sprintf(const u8 *build_id, int len, char *bf);
int kallsyms__parse(const char *filename, void *arg,
int (*process_symbol)(void *arg, const char *name,
char type, u64 start, u64 end));
+int filename__read_debuglink(const char *filename, char *debuglink,
+ size_t size);
void machine__destroy_kernel_maps(struct machine *machine);
int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel);
@@ -298,6 +302,7 @@ void machines__destroy_guest_kernel_maps(struct rb_root *machines);
int symbol__init(void);
void symbol__exit(void);
void symbol__elf_init(void);
+struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name);
size_t symbol__fprintf_symname_offs(const struct symbol *sym,
const struct addr_location *al, FILE *fp);
size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp);
@@ -305,4 +310,14 @@ bool symbol_type__is_a(char symbol_type, enum map_type map_type);
size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp);
+void symbols__insert(struct rb_root *symbols, struct symbol *sym);
+void symbols__fixup_duplicate(struct rb_root *symbols);
+void symbols__fixup_end(struct rb_root *symbols);
+void __map_groups__fixup_end(struct map_groups *mg, enum map_type type);
+
+int dso__load_sym(struct dso *dso, struct map *map, const char *name, int fd,
+ symbol_filter_t filter, int kmodule, int want_symtab);
+int dso__synthesize_plt_symbols(struct dso *dso, char *name, struct map *map,
+ symbol_filter_t filter);
+
#endif /* __PERF_SYMBOL */
--
1.7.10.4
--
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