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>

1 files changed, 7 insertions, 797 deletions

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index a61fec4..f02de8a 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -15,8 +15,6 @@
 #include "symbol.h"
 #include "strlist.h"
 
-#include <libelf.h>
-#include <gelf.h>
 #include <elf.h>
 #include <limits.h>
 #include <sys/utsname.h>
@@ -25,15 +23,7 @@
 #define KSYM_NAME_LEN 256
 #endif
 
-#ifndef NT_GNU_BUILD_ID
-#define NT_GNU_BUILD_ID 3
-#endif
-
 static void dso_cache__free(struct rb_root *root);
-static bool dso__build_id_equal(const struct dso *dso, u8 *build_id);
-static int elf_read_build_id(Elf *elf, void *bf, size_t size);
-static void dsos__add(struct list_head *head, struct dso *dso);
-static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
 static int dso__load_kernel_sym(struct dso *dso, struct map *map,
 				symbol_filter_t filter);
 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
@@ -170,7 +160,7 @@ static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
 		return SYMBOL_B;
 }
 
-static void symbols__fixup_duplicate(struct rb_root *symbols)
+void symbols__fixup_duplicate(struct rb_root *symbols)
 {
 	struct rb_node *nd;
 	struct symbol *curr, *next;
@@ -199,7 +189,7 @@ again:
 	}
 }
 
-static void symbols__fixup_end(struct rb_root *symbols)
+void symbols__fixup_end(struct rb_root *symbols)
 {
 	struct rb_node *nd, *prevnd = rb_first(symbols);
 	struct symbol *curr, *prev;
@@ -222,7 +212,7 @@ static void symbols__fixup_end(struct rb_root *symbols)
 		curr->end = roundup(curr->start, 4096);
 }
 
-static void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
+void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
 {
 	struct map *prev, *curr;
 	struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
@@ -252,8 +242,7 @@ static void map_groups__fixup_end(struct map_groups *mg)
 		__map_groups__fixup_end(mg, i);
 }
 
-static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
-				  const char *name)
+struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
 {
 	size_t namelen = strlen(name) + 1;
 	struct symbol *sym = calloc(1, (symbol_conf.priv_size +
@@ -390,7 +379,7 @@ void dso__set_build_id(struct dso *dso, void *build_id)
 	dso->has_build_id = 1;
 }
 
-static void symbols__insert(struct rb_root *symbols, struct symbol *sym)
+void symbols__insert(struct rb_root *symbols, struct symbol *sym)
 {
 	struct rb_node **p = &symbols->rb_node;
 	struct rb_node *parent = NULL;
@@ -904,561 +893,7 @@ out_failure:
 	return -1;
 }
 
-/**
- * elf_symtab__for_each_symbol - iterate thru all the symbols
- *
- * @syms: struct elf_symtab instance to iterate
- * @idx: uint32_t idx
- * @sym: GElf_Sym iterator
- */
-#define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
-	for (idx = 0, gelf_getsym(syms, idx, &sym);\
-	     idx < nr_syms; \
-	     idx++, gelf_getsym(syms, idx, &sym))
-
-static inline uint8_t elf_sym__type(const GElf_Sym *sym)
-{
-	return GELF_ST_TYPE(sym->st_info);
-}
-
-static inline int elf_sym__is_function(const GElf_Sym *sym)
-{
-	return elf_sym__type(sym) == STT_FUNC &&
-	       sym->st_name != 0 &&
-	       sym->st_shndx != SHN_UNDEF;
-}
-
-static inline bool elf_sym__is_object(const GElf_Sym *sym)
-{
-	return elf_sym__type(sym) == STT_OBJECT &&
-		sym->st_name != 0 &&
-		sym->st_shndx != SHN_UNDEF;
-}
-
-static inline int elf_sym__is_label(const GElf_Sym *sym)
-{
-	return elf_sym__type(sym) == STT_NOTYPE &&
-		sym->st_name != 0 &&
-		sym->st_shndx != SHN_UNDEF &&
-		sym->st_shndx != SHN_ABS;
-}
-
-static inline const char *elf_sec__name(const GElf_Shdr *shdr,
-					const Elf_Data *secstrs)
-{
-	return secstrs->d_buf + shdr->sh_name;
-}
-
-static inline int elf_sec__is_text(const GElf_Shdr *shdr,
-					const Elf_Data *secstrs)
-{
-	return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
-}
-
-static inline bool elf_sec__is_data(const GElf_Shdr *shdr,
-				    const Elf_Data *secstrs)
-{
-	return strstr(elf_sec__name(shdr, secstrs), "data") != NULL;
-}
-
-static inline const char *elf_sym__name(const GElf_Sym *sym,
-					const Elf_Data *symstrs)
-{
-	return symstrs->d_buf + sym->st_name;
-}
-
-static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
-				    GElf_Shdr *shp, const char *name,
-				    size_t *idx)
-{
-	Elf_Scn *sec = NULL;
-	size_t cnt = 1;
-
-	while ((sec = elf_nextscn(elf, sec)) != NULL) {
-		char *str;
-
-		gelf_getshdr(sec, shp);
-		str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
-		if (!strcmp(name, str)) {
-			if (idx)
-				*idx = cnt;
-			break;
-		}
-		++cnt;
-	}
-
-	return sec;
-}
-
-#define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \
-	for (idx = 0, pos = gelf_getrel(reldata, 0, &pos_mem); \
-	     idx < nr_entries; \
-	     ++idx, pos = gelf_getrel(reldata, idx, &pos_mem))
-
-#define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries) \
-	for (idx = 0, pos = gelf_getrela(reldata, 0, &pos_mem); \
-	     idx < nr_entries; \
-	     ++idx, pos = gelf_getrela(reldata, idx, &pos_mem))
-
-/*
- * We need to check if we have a .dynsym, so that we can handle the
- * .plt, synthesizing its symbols, that aren't on the symtabs (be it
- * .dynsym or .symtab).
- * And always look at the original dso, not at debuginfo packages, that
- * have the PLT data stripped out (shdr_rel_plt.sh_type == SHT_NOBITS).
- */
-static int
-dso__synthesize_plt_symbols(struct dso *dso, char *name, struct map *map,
-			    symbol_filter_t filter)
-{
-	uint32_t nr_rel_entries, idx;
-	GElf_Sym sym;
-	u64 plt_offset;
-	GElf_Shdr shdr_plt;
-	struct symbol *f;
-	GElf_Shdr shdr_rel_plt, shdr_dynsym;
-	Elf_Data *reldata, *syms, *symstrs;
-	Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym;
-	size_t dynsym_idx;
-	GElf_Ehdr ehdr;
-	char sympltname[1024];
-	Elf *elf;
-	int nr = 0, symidx, fd, err = 0;
-
-	fd = open(name, O_RDONLY);
-	if (fd < 0)
-		goto out;
-
-	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
-	if (elf == NULL)
-		goto out_close;
-
-	if (gelf_getehdr(elf, &ehdr) == NULL)
-		goto out_elf_end;
-
-	scn_dynsym = elf_section_by_name(elf, &ehdr, &shdr_dynsym,
-					 ".dynsym", &dynsym_idx);
-	if (scn_dynsym == NULL)
-		goto out_elf_end;
-
-	scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
-					  ".rela.plt", NULL);
-	if (scn_plt_rel == NULL) {
-		scn_plt_rel = elf_section_by_name(elf, &ehdr, &shdr_rel_plt,
-						  ".rel.plt", NULL);
-		if (scn_plt_rel == NULL)
-			goto out_elf_end;
-	}
-
-	err = -1;
-
-	if (shdr_rel_plt.sh_link != dynsym_idx)
-		goto out_elf_end;
-
-	if (elf_section_by_name(elf, &ehdr, &shdr_plt, ".plt", NULL) == NULL)
-		goto out_elf_end;
-
-	/*
-	 * Fetch the relocation section to find the idxes to the GOT
-	 * and the symbols in the .dynsym they refer to.
-	 */
-	reldata = elf_getdata(scn_plt_rel, NULL);
-	if (reldata == NULL)
-		goto out_elf_end;
-
-	syms = elf_getdata(scn_dynsym, NULL);
-	if (syms == NULL)
-		goto out_elf_end;
-
-	scn_symstrs = elf_getscn(elf, shdr_dynsym.sh_link);
-	if (scn_symstrs == NULL)
-		goto out_elf_end;
-
-	symstrs = elf_getdata(scn_symstrs, NULL);
-	if (symstrs == NULL)
-		goto out_elf_end;
-
-	nr_rel_entries = shdr_rel_plt.sh_size / shdr_rel_plt.sh_entsize;
-	plt_offset = shdr_plt.sh_offset;
-
-	if (shdr_rel_plt.sh_type == SHT_RELA) {
-		GElf_Rela pos_mem, *pos;
-
-		elf_section__for_each_rela(reldata, pos, pos_mem, idx,
-					   nr_rel_entries) {
-			symidx = GELF_R_SYM(pos->r_info);
-			plt_offset += shdr_plt.sh_entsize;
-			gelf_getsym(syms, symidx, &sym);
-			snprintf(sympltname, sizeof(sympltname),
-				 "%s@plt", elf_sym__name(&sym, symstrs));
-
-			f = symbol__new(plt_offset, shdr_plt.sh_entsize,
-					STB_GLOBAL, sympltname);
-			if (!f)
-				goto out_elf_end;
-
-			if (filter && filter(map, f))
-				symbol__delete(f);
-			else {
-				symbols__insert(&dso->symbols[map->type], f);
-				++nr;
-			}
-		}
-	} else if (shdr_rel_plt.sh_type == SHT_REL) {
-		GElf_Rel pos_mem, *pos;
-		elf_section__for_each_rel(reldata, pos, pos_mem, idx,
-					  nr_rel_entries) {
-			symidx = GELF_R_SYM(pos->r_info);
-			plt_offset += shdr_plt.sh_entsize;
-			gelf_getsym(syms, symidx, &sym);
-			snprintf(sympltname, sizeof(sympltname),
-				 "%s@plt", elf_sym__name(&sym, symstrs));
-
-			f = symbol__new(plt_offset, shdr_plt.sh_entsize,
-					STB_GLOBAL, sympltname);
-			if (!f)
-				goto out_elf_end;
-
-			if (filter && filter(map, f))
-				symbol__delete(f);
-			else {
-				symbols__insert(&dso->symbols[map->type], f);
-				++nr;
-			}
-		}
-	}
-
-	err = 0;
-out_elf_end:
-	elf_end(elf);
-out_close:
-	close(fd);
-
-	if (err == 0)
-		return nr;
-out:
-	pr_debug("%s: problems reading %s PLT info.\n",
-		 __func__, dso->long_name);
-	return 0;
-}
-
-static bool elf_sym__is_a(GElf_Sym *sym, enum map_type type)
-{
-	switch (type) {
-	case MAP__FUNCTION:
-		return elf_sym__is_function(sym);
-	case MAP__VARIABLE:
-		return elf_sym__is_object(sym);
-	default:
-		return false;
-	}
-}
-
-static bool elf_sec__is_a(GElf_Shdr *shdr, Elf_Data *secstrs,
-			  enum map_type type)
-{
-	switch (type) {
-	case MAP__FUNCTION:
-		return elf_sec__is_text(shdr, secstrs);
-	case MAP__VARIABLE:
-		return elf_sec__is_data(shdr, secstrs);
-	default:
-		return false;
-	}
-}
-
-static size_t elf_addr_to_index(Elf *elf, GElf_Addr addr)
-{
-	Elf_Scn *sec = NULL;
-	GElf_Shdr shdr;
-	size_t cnt = 1;
-
-	while ((sec = elf_nextscn(elf, sec)) != NULL) {
-		gelf_getshdr(sec, &shdr);
-
-		if ((addr >= shdr.sh_addr) &&
-		    (addr < (shdr.sh_addr + shdr.sh_size)))
-			return cnt;
-
-		++cnt;
-	}
-
-	return -1;
-}
-
-static int dso__swap_init(struct dso *dso, unsigned char eidata)
-{
-	static unsigned int const endian = 1;
-
-	dso->needs_swap = DSO_SWAP__NO;
-
-	switch (eidata) {
-	case ELFDATA2LSB:
-		/* We are big endian, DSO is little endian. */
-		if (*(unsigned char const *)&endian != 1)
-			dso->needs_swap = DSO_SWAP__YES;
-		break;
-
-	case ELFDATA2MSB:
-		/* We are little endian, DSO is big endian. */
-		if (*(unsigned char const *)&endian != 0)
-			dso->needs_swap = DSO_SWAP__YES;
-		break;
-
-	default:
-		pr_err("unrecognized DSO data encoding %d\n", eidata);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static int dso__load_sym(struct dso *dso, struct map *map, const char *name,
-			 int fd, symbol_filter_t filter, int kmodule,
-			 int want_symtab)
-{
-	struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL;
-	struct map *curr_map = map;
-	struct dso *curr_dso = dso;
-	Elf_Data *symstrs, *secstrs;
-	uint32_t nr_syms;
-	int err = -1;
-	uint32_t idx;
-	GElf_Ehdr ehdr;
-	GElf_Shdr shdr, opdshdr;
-	Elf_Data *syms, *opddata = NULL;
-	GElf_Sym sym;
-	Elf_Scn *sec, *sec_strndx, *opdsec;
-	Elf *elf;
-	int nr = 0;
-	size_t opdidx = 0;
-
-	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
-	if (elf == NULL) {
-		pr_debug("%s: cannot read %s ELF file.\n", __func__, name);
-		goto out_close;
-	}
-
-	if (gelf_getehdr(elf, &ehdr) == NULL) {
-		pr_debug("%s: cannot get elf header.\n", __func__);
-		goto out_elf_end;
-	}
-
-	if (dso__swap_init(dso, ehdr.e_ident[EI_DATA]))
-		goto out_elf_end;
-
-	/* Always reject images with a mismatched build-id: */
-	if (dso->has_build_id) {
-		u8 build_id[BUILD_ID_SIZE];
-
-		if (elf_read_build_id(elf, build_id, BUILD_ID_SIZE) < 0)
-			goto out_elf_end;
-
-		if (!dso__build_id_equal(dso, build_id))
-			goto out_elf_end;
-	}
-
-	sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
-	if (sec == NULL) {
-		if (want_symtab)
-			goto out_elf_end;
-
-		sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
-		if (sec == NULL)
-			goto out_elf_end;
-	}
-
-	opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
-	if (opdshdr.sh_type != SHT_PROGBITS)
-		opdsec = NULL;
-	if (opdsec)
-		opddata = elf_rawdata(opdsec, NULL);
-
-	syms = elf_getdata(sec, NULL);
-	if (syms == NULL)
-		goto out_elf_end;
-
-	sec = elf_getscn(elf, shdr.sh_link);
-	if (sec == NULL)
-		goto out_elf_end;
-
-	symstrs = elf_getdata(sec, NULL);
-	if (symstrs == NULL)
-		goto out_elf_end;
-
-	sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
-	if (sec_strndx == NULL)
-		goto out_elf_end;
-
-	secstrs = elf_getdata(sec_strndx, NULL);
-	if (secstrs == NULL)
-		goto out_elf_end;
-
-	nr_syms = shdr.sh_size / shdr.sh_entsize;
-
-	memset(&sym, 0, sizeof(sym));
-	if (dso->kernel == DSO_TYPE_USER) {
-		dso->adjust_symbols = (ehdr.e_type == ET_EXEC ||
-				elf_section_by_name(elf, &ehdr, &shdr,
-						     ".gnu.prelink_undo",
-						     NULL) != NULL);
-	} else {
-		dso->adjust_symbols = 0;
-	}
-	elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) {
-		struct symbol *f;
-		const char *elf_name = elf_sym__name(&sym, symstrs);
-		char *demangled = NULL;
-		int is_label = elf_sym__is_label(&sym);
-		const char *section_name;
-
-		if (kmap && kmap->ref_reloc_sym && kmap->ref_reloc_sym->name &&
-		    strcmp(elf_name, kmap->ref_reloc_sym->name) == 0)
-			kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
-
-		if (!is_label && !elf_sym__is_a(&sym, map->type))
-			continue;
-
-		/* Reject ARM ELF "mapping symbols": these aren't unique and
-		 * don't identify functions, so will confuse the profile
-		 * output: */
-		if (ehdr.e_machine == EM_ARM) {
-			if (!strcmp(elf_name, "$a") ||
-			    !strcmp(elf_name, "$d") ||
-			    !strcmp(elf_name, "$t"))
-				continue;
-		}
-
-		if (opdsec && sym.st_shndx == opdidx) {
-			u32 offset = sym.st_value - opdshdr.sh_addr;
-			u64 *opd = opddata->d_buf + offset;
-			sym.st_value = DSO__SWAP(dso, u64, *opd);
-			sym.st_shndx = elf_addr_to_index(elf, sym.st_value);
-		}
-
-		sec = elf_getscn(elf, sym.st_shndx);
-		if (!sec)
-			goto out_elf_end;
-
-		gelf_getshdr(sec, &shdr);
-
-		if (is_label && !elf_sec__is_a(&shdr, secstrs, map->type))
-			continue;
-
-		section_name = elf_sec__name(&shdr, secstrs);
-
-		/* On ARM, symbols for thumb functions have 1 added to
-		 * the symbol address as a flag - remove it */
-		if ((ehdr.e_machine == EM_ARM) &&
-		    (map->type == MAP__FUNCTION) &&
-		    (sym.st_value & 1))
-			--sym.st_value;
-
-		if (dso->kernel != DSO_TYPE_USER || kmodule) {
-			char dso_name[PATH_MAX];
-
-			if (strcmp(section_name,
-				   (curr_dso->short_name +
-				    dso->short_name_len)) == 0)
-				goto new_symbol;
-
-			if (strcmp(section_name, ".text") == 0) {
-				curr_map = map;
-				curr_dso = dso;
-				goto new_symbol;
-			}
-
-			snprintf(dso_name, sizeof(dso_name),
-				 "%s%s", dso->short_name, section_name);
-
-			curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
-			if (curr_map == NULL) {
-				u64 start = sym.st_value;
-
-				if (kmodule)
-					start += map->start + shdr.sh_offset;
-
-				curr_dso = dso__new(dso_name);
-				if (curr_dso == NULL)
-					goto out_elf_end;
-				curr_dso->kernel = dso->kernel;
-				curr_dso->long_name = dso->long_name;
-				curr_dso->long_name_len = dso->long_name_len;
-				curr_map = map__new2(start, curr_dso,
-						     map->type);
-				if (curr_map == NULL) {
-					dso__delete(curr_dso);
-					goto out_elf_end;
-				}
-				curr_map->map_ip = identity__map_ip;
-				curr_map->unmap_ip = identity__map_ip;
-				curr_dso->symtab_type = dso->symtab_type;
-				map_groups__insert(kmap->kmaps, curr_map);
-				dsos__add(&dso->node, curr_dso);
-				dso__set_loaded(curr_dso, map->type);
-			} else
-				curr_dso = curr_map->dso;
-
-			goto new_symbol;
-		}
-
-		if (curr_dso->adjust_symbols) {
-			pr_debug4("%s: adjusting symbol: st_value: %#" PRIx64 " "
-				  "sh_addr: %#" PRIx64 " sh_offset: %#" PRIx64 "\n", __func__,
-				  (u64)sym.st_value, (u64)shdr.sh_addr,
-				  (u64)shdr.sh_offset);
-			sym.st_value -= shdr.sh_addr - shdr.sh_offset;
-		}
-		/*
-		 * We need to figure out if the object was created from C++ sources
-		 * DWARF DW_compile_unit has this, but we don't always have access
-		 * to it...
-		 */
-		demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
-		if (demangled != NULL)
-			elf_name = demangled;
-new_symbol:
-		f = symbol__new(sym.st_value, sym.st_size,
-				GELF_ST_BIND(sym.st_info), elf_name);
-		free(demangled);
-		if (!f)
-			goto out_elf_end;
-
-		if (filter && filter(curr_map, f))
-			symbol__delete(f);
-		else {
-			symbols__insert(&curr_dso->symbols[curr_map->type], f);
-			nr++;
-		}
-	}
-
-	/*
-	 * For misannotated, zeroed, ASM function sizes.
-	 */
-	if (nr > 0) {
-		symbols__fixup_duplicate(&dso->symbols[map->type]);
-		symbols__fixup_end(&dso->symbols[map->type]);
-		if (kmap) {
-			/*
-			 * We need to fixup this here too because we create new
-			 * maps here, for things like vsyscall sections.
-			 */
-			__map_groups__fixup_end(kmap->kmaps, map->type);
-		}
-	}
-	err = nr;
-out_elf_end:
-	elf_end(elf);
-out_close:
-	return err;
-}
-
-void symbol__elf_init(void)
-{
-	elf_version(EV_CURRENT);
-}
-
-static bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
+bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
 {
 	return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
 }
@@ -1485,212 +920,6 @@ bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
 	return have_build_id;
 }
 
-/*
- * Align offset to 4 bytes as needed for note name and descriptor data.
- */
-#define NOTE_ALIGN(n) (((n) + 3) & -4U)
-
-static int elf_read_build_id(Elf *elf, void *bf, size_t size)
-{
-	int err = -1;
-	GElf_Ehdr ehdr;
-	GElf_Shdr shdr;
-	Elf_Data *data;
-	Elf_Scn *sec;
-	Elf_Kind ek;
-	void *ptr;
-
-	if (size < BUILD_ID_SIZE)
-		goto out;
-
-	ek = elf_kind(elf);
-	if (ek != ELF_K_ELF)
-		goto out;
-
-	if (gelf_getehdr(elf, &ehdr) == NULL) {
-		pr_err("%s: cannot get elf header.\n", __func__);
-		goto out;
-	}
-
-	/*
-	 * Check following sections for notes:
-	 *   '.note.gnu.build-id'
-	 *   '.notes'
-	 *   '.note' (VDSO specific)
-	 */
-	do {
-		sec = elf_section_by_name(elf, &ehdr, &shdr,
-					  ".note.gnu.build-id", NULL);
-		if (sec)
-			break;
-
-		sec = elf_section_by_name(elf, &ehdr, &shdr,
-					  ".notes", NULL);
-		if (sec)
-			break;
-
-		sec = elf_section_by_name(elf, &ehdr, &shdr,
-					  ".note", NULL);
-		if (sec)
-			break;
-
-		return err;
-
-	} while (0);
-
-	data = elf_getdata(sec, NULL);
-	if (data == NULL)
-		goto out;
-
-	ptr = data->d_buf;
-	while (ptr < (data->d_buf + data->d_size)) {
-		GElf_Nhdr *nhdr = ptr;
-		size_t namesz = NOTE_ALIGN(nhdr->n_namesz),
-		       descsz = NOTE_ALIGN(nhdr->n_descsz);
-		const char *name;
-
-		ptr += sizeof(*nhdr);
-		name = ptr;
-		ptr += namesz;
-		if (nhdr->n_type == NT_GNU_BUILD_ID &&
-		    nhdr->n_namesz == sizeof("GNU")) {
-			if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
-				size_t sz = min(size, descsz);
-				memcpy(bf, ptr, sz);
-				memset(bf + sz, 0, size - sz);
-				err = descsz;
-				break;
-			}
-		}
-		ptr += descsz;
-	}
-
-out:
-	return err;
-}
-
-int filename__read_build_id(const char *filename, void *bf, size_t size)
-{
-	int fd, err = -1;
-	Elf *elf;
-
-	if (size < BUILD_ID_SIZE)
-		goto out;
-
-	fd = open(filename, O_RDONLY);
-	if (fd < 0)
-		goto out;
-
-	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
-	if (elf == NULL) {
-		pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
-		goto out_close;
-	}
-
-	err = elf_read_build_id(elf, bf, size);
-
-	elf_end(elf);
-out_close:
-	close(fd);
-out:
-	return err;
-}
-
-int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
-{
-	int fd, err = -1;
-
-	if (size < BUILD_ID_SIZE)
-		goto out;
-
-	fd = open(filename, O_RDONLY);
-	if (fd < 0)
-		goto out;
-
-	while (1) {
-		char bf[BUFSIZ];
-		GElf_Nhdr nhdr;
-		size_t namesz, descsz;
-
-		if (read(fd, &nhdr, sizeof(nhdr)) != sizeof(nhdr))
-			break;
-
-		namesz = NOTE_ALIGN(nhdr.n_namesz);
-		descsz = NOTE_ALIGN(nhdr.n_descsz);
-		if (nhdr.n_type == NT_GNU_BUILD_ID &&
-		    nhdr.n_namesz == sizeof("GNU")) {
-			if (read(fd, bf, namesz) != (ssize_t)namesz)
-				break;
-			if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
-				size_t sz = min(descsz, size);
-				if (read(fd, build_id, sz) == (ssize_t)sz) {
-					memset(build_id + sz, 0, size - sz);
-					err = 0;
-					break;
-				}
-			} else if (read(fd, bf, descsz) != (ssize_t)descsz)
-				break;
-		} else {
-			int n = namesz + descsz;
-			if (read(fd, bf, n) != n)
-				break;
-		}
-	}
-	close(fd);
-out:
-	return err;
-}
-
-static int filename__read_debuglink(const char *filename,
-				    char *debuglink, size_t size)
-{
-	int fd, err = -1;
-	Elf *elf;
-	GElf_Ehdr ehdr;
-	GElf_Shdr shdr;
-	Elf_Data *data;
-	Elf_Scn *sec;
-	Elf_Kind ek;
-
-	fd = open(filename, O_RDONLY);
-	if (fd < 0)
-		goto out;
-
-	elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
-	if (elf == NULL) {
-		pr_debug2("%s: cannot read %s ELF file.\n", __func__, filename);
-		goto out_close;
-	}
-
-	ek = elf_kind(elf);
-	if (ek != ELF_K_ELF)
-		goto out_close;
-
-	if (gelf_getehdr(elf, &ehdr) == NULL) {
-		pr_err("%s: cannot get elf header.\n", __func__);
-		goto out_close;
-	}
-
-	sec = elf_section_by_name(elf, &ehdr, &shdr,
-				  ".gnu_debuglink", NULL);
-	if (sec == NULL)
-		goto out_close;
-
-	data = elf_getdata(sec, NULL);
-	if (data == NULL)
-		goto out_close;
-
-	/* the start of this section is a zero-terminated string */
-	strncpy(debuglink, data->d_buf, size);
-
-	elf_end(elf);
-
-out_close:
-	close(fd);
-out:
-	return err;
-}
-
 char dso__symtab_origin(const struct dso *dso)
 {
 	static const char origin[] = {
@@ -2035,25 +1264,6 @@ static int machine__set_modules_path(struct machine *machine)
 	return map_groups__set_modules_path_dir(&machine->kmaps, modules_path);
 }
 
-/*
- * Constructor variant for modules (where we know from /proc/modules where
- * they are loaded) and for vmlinux, where only after we load all the
- * symbols we'll know where it starts and ends.
- */
-static struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
-{
-	struct map *map = calloc(1, (sizeof(*map) +
-				     (dso->kernel ? sizeof(struct kmap) : 0)));
-	if (map != NULL) {
-		/*
-		 * ->end will be filled after we load all the symbols
-		 */
-		map__init(map, type, start, 0, 0, dso);
-	}
-
-	return map;
-}
-
 struct map *machine__new_module(struct machine *machine, u64 start,
 				const char *filename)
 {
@@ -2357,7 +1567,7 @@ out_try_fixup:
 	return err;
 }
 
-static void dsos__add(struct list_head *head, struct dso *dso)
+void dsos__add(struct list_head *head, struct dso *dso)
 {
 	list_add_tail(&dso->node, head);
 }