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>
This commit is contained in:
Namhyung Kim
Arnaldo Carvalho de Melo
parent
166ccc9c24
commit
e5a1845fc0
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@ -356,6 +356,7 @@ LIB_OBJS += $(OUTPUT)util/usage.o
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LIB_OBJS += $(OUTPUT)util/wrapper.o
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LIB_OBJS += $(OUTPUT)util/sigchain.o
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LIB_OBJS += $(OUTPUT)util/symbol.o
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LIB_OBJS += $(OUTPUT)util/symbol-elf.o
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LIB_OBJS += $(OUTPUT)util/dso-test-data.o
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LIB_OBJS += $(OUTPUT)util/color.o
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LIB_OBJS += $(OUTPUT)util/pager.o
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@ -86,6 +86,25 @@ out_delete:
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return NULL;
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}
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/*
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* Constructor variant for modules (where we know from /proc/modules where
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* they are loaded) and for vmlinux, where only after we load all the
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* symbols we'll know where it starts and ends.
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*/
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struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
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{
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struct map *map = calloc(1, (sizeof(*map) +
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(dso->kernel ? sizeof(struct kmap) : 0)));
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if (map != NULL) {
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/*
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* ->end will be filled after we load all the symbols
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*/
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map__init(map, type, start, 0, 0, dso);
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}
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return map;
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}
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void map__delete(struct map *self)
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{
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free(self);
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@ -115,6 +115,7 @@ void map__init(struct map *self, enum map_type type,
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struct map *map__new(struct list_head *dsos__list, u64 start, u64 len,
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u64 pgoff, u32 pid, char *filename,
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enum map_type type);
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struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
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void map__delete(struct map *self);
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struct map *map__clone(struct map *self);
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int map__overlap(struct map *l, struct map *r);
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@ -0,0 +1,774 @@
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#include <libelf.h>
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#include <gelf.h>
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#include <elf.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include "symbol.h"
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#include "debug.h"
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#ifndef NT_GNU_BUILD_ID
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#define NT_GNU_BUILD_ID 3
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#endif
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/**
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* elf_symtab__for_each_symbol - iterate thru all the symbols
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*
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* @syms: struct elf_symtab instance to iterate
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* @idx: uint32_t idx
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* @sym: GElf_Sym iterator
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*/
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#define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
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for (idx = 0, gelf_getsym(syms, idx, &sym);\
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idx < nr_syms; \
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idx++, gelf_getsym(syms, idx, &sym))
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static inline uint8_t elf_sym__type(const GElf_Sym *sym)
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{
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return GELF_ST_TYPE(sym->st_info);
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}
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static inline int elf_sym__is_function(const GElf_Sym *sym)
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{
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return elf_sym__type(sym) == STT_FUNC &&
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sym->st_name != 0 &&
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sym->st_shndx != SHN_UNDEF;
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}
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static inline bool elf_sym__is_object(const GElf_Sym *sym)
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{
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return elf_sym__type(sym) == STT_OBJECT &&
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sym->st_name != 0 &&
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sym->st_shndx != SHN_UNDEF;
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}
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static inline int elf_sym__is_label(const GElf_Sym *sym)
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{
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return elf_sym__type(sym) == STT_NOTYPE &&
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sym->st_name != 0 &&
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sym->st_shndx != SHN_UNDEF &&
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sym->st_shndx != SHN_ABS;
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}
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static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type)
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{
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switch (type) {
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case MAP__FUNCTION:
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return elf_sym__is_function(sym);
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case MAP__VARIABLE:
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return elf_sym__is_object(sym);
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default:
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return false;
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}
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}
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static inline const char *elf_sym__name(const GElf_Sym *sym,
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const Elf_Data *symstrs)
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{
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return symstrs->d_buf + sym->st_name;
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}
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static inline const char *elf_sec__name(const GElf_Shdr *shdr,
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const Elf_Data *secstrs)
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{
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return secstrs->d_buf + shdr->sh_name;
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}
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static inline int elf_sec__is_text(const GElf_Shdr *shdr,
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const Elf_Data *secstrs)
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{
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return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
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}
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static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
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const Elf_Data *secstrs)
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{
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return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
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}
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static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs,
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enum map_type type)
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{
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switch (type) {
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case MAP__FUNCTION:
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return elf_sec__is_text(shdr, secstrs);
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case MAP__VARIABLE:
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return elf_sec__is_data(shdr, secstrs);
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default:
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return false;
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}
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}
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static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
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{
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Elf_Scn *sec = NULL;
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GElf_Shdr shdr;
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size_t cnt = 1;
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while ((sec = elf_nextscn(elf, sec)) != NULL) {
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gelf_getshdr(sec, &shdr);
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if ((addr >= shdr.sh_addr) &&
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(addr < (shdr.sh_addr + shdr.sh_size)))
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return cnt;
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++cnt;
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}
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return -1;
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}
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static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
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GElf_Shdr *shp, const char *name,
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size_t *idx)
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{
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Elf_Scn *sec = NULL;
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size_t cnt = 1;
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while ((sec = elf_nextscn(elf, sec)) != NULL) {
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char *str;
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gelf_getshdr(sec, shp);
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str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
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if (!strcmp(name, str)) {
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if (idx)
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*idx = cnt;
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break;
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}
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++cnt;
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}
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return sec;
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}
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#define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
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for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
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idx < nr_entries; \
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++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
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#define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
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for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
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idx < nr_entries; \
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++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
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/*
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* We need to check if we have a .dynsym, so that we can handle the
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* .plt, synthesizing its symbols, that aren't on the symtabs (be it
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* .dynsym or .symtab).
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* And always look at the original dso, not at debuginfo packages, that
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* have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
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*/
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int dso__synthesize_plt_symbols(struct dso *dso, char *name, struct map *map,
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symbol_filter_t filter)
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{
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uint32_t nr_rel_entries, idx;
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GElf_Sym sym;
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u64 plt_offset;
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GElf_Shdr shdr_plt;
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struct symbol *f;
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GElf_Shdr shdr_rel_plt, shdr_dynsym;
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Elf_Data *reldata, *syms, *symstrs;
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Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
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size_t dynsym_idx;
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GElf_Ehdr ehdr;
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char sympltname[1024];
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Elf *elf;
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int nr = 0, symidx, fd, err = 0;
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fd = open(name, O_RDONLY);
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if (fd < 0)
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goto out;
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elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
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if (elf == NULL)
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goto out_close;
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if (gelf_getehdr(elf, &ehdr) == NULL)
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goto out_elf_end;
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scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
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".dynsym", &dynsym_idx);
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if (scn_dynsym == NULL)
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goto out_elf_end;
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scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
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".rela.plt", NULL);
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if (scn_plt_rel == NULL) {
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scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
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".rel.plt", NULL);
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if (scn_plt_rel == NULL)
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goto out_elf_end;
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}
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err = -1;
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if (shdr_rel_plt.sh_link != dynsym_idx)
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goto out_elf_end;
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if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
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goto out_elf_end;
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/*
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* Fetch the relocation section to find the idxes to the GOT
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* and the symbols in the .dynsym they refer to.
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*/
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reldata = elf_getdata(scn_plt_rel, NULL);
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if (reldata == NULL)
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goto out_elf_end;
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syms = elf_getdata(scn_dynsym, NULL);
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if (syms == NULL)
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goto out_elf_end;
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scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
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if (scn_symstrs == NULL)
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goto out_elf_end;
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symstrs = elf_getdata(scn_symstrs, NULL);
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if (symstrs == NULL)
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goto out_elf_end;
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nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
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plt_offset = shdr_plt.sh_offset;
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if (shdr_rel_plt.sh_type == SHT_RELA) {
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GElf_Rela pos_mem, *pos;
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elf_section__for_each_rela(reldata, pos, pos_mem, idx,
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nr_rel_entries) {
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symidx = GELF_R_SYM(pos->r_info);
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plt_offset += shdr_plt.sh_entsize;
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gelf_getsym(syms, symidx, &sym);
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snprintf(sympltname, sizeof(sympltname),
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"%s@plt", elf_sym__name(&sym, symstrs));
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f = symbol__new(plt_offset, shdr_plt.sh_entsize,
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STB_GLOBAL, sympltname);
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if (!f)
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goto out_elf_end;
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if (filter && filter(map, f))
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symbol__delete(f);
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else {
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symbols__insert(&dso->symbols[map->type], f);
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++nr;
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}
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}
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} else if (shdr_rel_plt.sh_type == SHT_REL) {
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GElf_Rel pos_mem, *pos;
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elf_section__for_each_rel(reldata, pos, pos_mem, idx,
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nr_rel_entries) {
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symidx = GELF_R_SYM(pos->r_info);
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plt_offset += shdr_plt.sh_entsize;
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gelf_getsym(syms, symidx, &sym);
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snprintf(sympltname, sizeof(sympltname),
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"%s@plt", elf_sym__name(&sym, symstrs));
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||||
f = symbol__new(plt_offset, shdr_plt.sh_entsize,
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STB_GLOBAL, sympltname);
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||||
if (!f)
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||||
goto out_elf_end;
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||||
|
||||
if (filter && filter(map, f))
|
||||
symbol__delete(f);
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||||
else {
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||||
symbols__insert(&dso->symbols[map->type], f);
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||||
++nr;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
err = 0;
|
||||
out_elf_end:
|
||||
elf_end(elf);
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||||
out_close:
|
||||
close(fd);
|
||||
|
||||
if (err == 0)
|
||||
return nr;
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||||
out:
|
||||
pr_debug("%s: problems reading %s PLT info.\n",
|
||||
__func__, dso->long_name);
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||||
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);
|
||||
}
|
||||
|
|
@ -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);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -254,6 +254,7 @@ 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);
|
||||
|
|
@ -283,6 +284,7 @@ size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp);
|
|||
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);
|
||||
|
|
@ -298,6 +300,8 @@ 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);
|
||||
|
|
@ -310,6 +314,7 @@ 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);
|
||||
|
|
@ -327,4 +332,14 @@ ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
|
|||
struct machine *machine, u64 addr,
|
||||
u8 *data, ssize_t size);
|
||||
int dso__test_data(void);
|
||||
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);
|
||||
|
||||
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);
|
||||
|
||||
#endif /* __PERF_SYMBOL */
|
||||
|
|
|
|||
Reference in New Issue