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Commit e5a1845f authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarNamhyung 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 166ccc9c

tools/perf/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -356,6 +356,7 @@ 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/dso-test-data.o

LIB_OBJS += $(OUTPUT)util/color.o

LIB_OBJS += $(OUTPUT)util/pager.o

tools/perf/util/map.c

+19 −0
Original line number Diff line number Diff line
@@ -86,6 +86,25 @@ struct map *map__new(struct list_head *dsos__list, u64 start, u64 len, 
	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);

tools/perf/util/map.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

tools/perf/util/symbol-elf.c

0 → 100644
+774 −0
Original line number Diff line number Diff line 
#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);

}

tools/perf/util/symbol.c

+7 −797

File changed.

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