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-rw-r--r--tools/perf/util/symbol.c2669
1 files changed, 2669 insertions, 0 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
new file mode 100644
index 00000000..40fd1c7c
--- /dev/null
+++ b/tools/perf/util/symbol.c
@@ -0,0 +1,2669 @@
+#define _GNU_SOURCE
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <libgen.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include "build-id.h"
+#include "debug.h"
+#include "symbol.h"
+#include "strlist.h"
+
+#include <libelf.h>
+#include <gelf.h>
+#include <elf.h>
+#include <limits.h>
+#include <sys/utsname.h>
+
+#ifndef KSYM_NAME_LEN
+#define KSYM_NAME_LEN 128
+#endif
+
+#ifndef NT_GNU_BUILD_ID
+#define NT_GNU_BUILD_ID 3
+#endif
+
+static bool dso__build_id_equal(const struct dso *dso, u8 *build_id);
+static int elf_read_build_id(Elf *elf, void *bf, size_t size);
+static void dsos__add(struct list_head *head, struct dso *dso);
+static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
+static int dso__load_kernel_sym(struct dso *dso, struct map *map,
+ symbol_filter_t filter);
+static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
+ symbol_filter_t filter);
+static int vmlinux_path__nr_entries;
+static char **vmlinux_path;
+
+struct symbol_conf symbol_conf = {
+ .exclude_other = true,
+ .use_modules = true,
+ .try_vmlinux_path = true,
+ .symfs = "",
+};
+
+int dso__name_len(const struct dso *dso)
+{
+ if (verbose)
+ return dso->long_name_len;
+
+ return dso->short_name_len;
+}
+
+bool dso__loaded(const struct dso *dso, enum map_type type)
+{
+ return dso->loaded & (1 << type);
+}
+
+bool dso__sorted_by_name(const struct dso *dso, enum map_type type)
+{
+ return dso->sorted_by_name & (1 << type);
+}
+
+static void dso__set_sorted_by_name(struct dso *dso, enum map_type type)
+{
+ dso->sorted_by_name |= (1 << type);
+}
+
+bool symbol_type__is_a(char symbol_type, enum map_type map_type)
+{
+ switch (map_type) {
+ case MAP__FUNCTION:
+ return symbol_type == 'T' || symbol_type == 'W';
+ case MAP__VARIABLE:
+ return symbol_type == 'D' || symbol_type == 'd';
+ default:
+ return false;
+ }
+}
+
+static void symbols__fixup_end(struct rb_root *symbols)
+{
+ struct rb_node *nd, *prevnd = rb_first(symbols);
+ struct symbol *curr, *prev;
+
+ if (prevnd == NULL)
+ return;
+
+ curr = rb_entry(prevnd, struct symbol, rb_node);
+
+ for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
+ prev = curr;
+ curr = rb_entry(nd, struct symbol, rb_node);
+
+ if (prev->end == prev->start && prev->end != curr->start)
+ prev->end = curr->start - 1;
+ }
+
+ /* Last entry */
+ if (curr->end == curr->start)
+ curr->end = roundup(curr->start, 4096);
+}
+
+static 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]);
+
+ if (prevnd == NULL)
+ return;
+
+ curr = rb_entry(prevnd, struct map, rb_node);
+
+ for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
+ prev = curr;
+ curr = rb_entry(nd, struct map, rb_node);
+ prev->end = curr->start - 1;
+ }
+
+ /*
+ * We still haven't the actual symbols, so guess the
+ * last map final address.
+ */
+ curr->end = ~0ULL;
+}
+
+static void map_groups__fixup_end(struct map_groups *mg)
+{
+ int i;
+ for (i = 0; i < MAP__NR_TYPES; ++i)
+ __map_groups__fixup_end(mg, i);
+}
+
+static 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 +
+ sizeof(*sym) + namelen));
+ if (sym == NULL)
+ return NULL;
+
+ if (symbol_conf.priv_size)
+ sym = ((void *)sym) + symbol_conf.priv_size;
+
+ sym->start = start;
+ sym->end = len ? start + len - 1 : start;
+ sym->binding = binding;
+ sym->namelen = namelen - 1;
+
+ pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
+ __func__, name, start, sym->end);
+ memcpy(sym->name, name, namelen);
+
+ return sym;
+}
+
+void symbol__delete(struct symbol *sym)
+{
+ free(((void *)sym) - symbol_conf.priv_size);
+}
+
+static size_t symbol__fprintf(struct symbol *sym, FILE *fp)
+{
+ return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
+ sym->start, sym->end,
+ sym->binding == STB_GLOBAL ? 'g' :
+ sym->binding == STB_LOCAL ? 'l' : 'w',
+ sym->name);
+}
+
+void dso__set_long_name(struct dso *dso, char *name)
+{
+ if (name == NULL)
+ return;
+ dso->long_name = name;
+ dso->long_name_len = strlen(name);
+}
+
+static void dso__set_short_name(struct dso *dso, const char *name)
+{
+ if (name == NULL)
+ return;
+ dso->short_name = name;
+ dso->short_name_len = strlen(name);
+}
+
+static void dso__set_basename(struct dso *dso)
+{
+ dso__set_short_name(dso, basename(dso->long_name));
+}
+
+struct dso *dso__new(const char *name)
+{
+ struct dso *dso = calloc(1, sizeof(*dso) + strlen(name) + 1);
+
+ if (dso != NULL) {
+ int i;
+ strcpy(dso->name, name);
+ dso__set_long_name(dso, dso->name);
+ dso__set_short_name(dso, dso->name);
+ for (i = 0; i < MAP__NR_TYPES; ++i)
+ dso->symbols[i] = dso->symbol_names[i] = RB_ROOT;
+ dso->symtab_type = SYMTAB__NOT_FOUND;
+ dso->loaded = 0;
+ dso->sorted_by_name = 0;
+ dso->has_build_id = 0;
+ dso->kernel = DSO_TYPE_USER;
+ INIT_LIST_HEAD(&dso->node);
+ }
+
+ return dso;
+}
+
+static void symbols__delete(struct rb_root *symbols)
+{
+ struct symbol *pos;
+ struct rb_node *next = rb_first(symbols);
+
+ while (next) {
+ pos = rb_entry(next, struct symbol, rb_node);
+ next = rb_next(&pos->rb_node);
+ rb_erase(&pos->rb_node, symbols);
+ symbol__delete(pos);
+ }
+}
+
+void dso__delete(struct dso *dso)
+{
+ int i;
+ for (i = 0; i < MAP__NR_TYPES; ++i)
+ symbols__delete(&dso->symbols[i]);
+ if (dso->sname_alloc)
+ free((char *)dso->short_name);
+ if (dso->lname_alloc)
+ free(dso->long_name);
+ free(dso);
+}
+
+void dso__set_build_id(struct dso *dso, void *build_id)
+{
+ memcpy(dso->build_id, build_id, sizeof(dso->build_id));
+ dso->has_build_id = 1;
+}
+
+static void symbols__insert(struct rb_root *symbols, struct symbol *sym)
+{
+ struct rb_node **p = &symbols->rb_node;
+ struct rb_node *parent = NULL;
+ const u64 ip = sym->start;
+ struct symbol *s;
+
+ while (*p != NULL) {
+ parent = *p;
+ s = rb_entry(parent, struct symbol, rb_node);
+ if (ip < s->start)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+ }
+ rb_link_node(&sym->rb_node, parent, p);
+ rb_insert_color(&sym->rb_node, symbols);
+}
+
+static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
+{
+ struct rb_node *n;
+
+ if (symbols == NULL)
+ return NULL;
+
+ n = symbols->rb_node;
+
+ while (n) {
+ struct symbol *s = rb_entry(n, struct symbol, rb_node);
+
+ if (ip < s->start)
+ n = n->rb_left;
+ else if (ip > s->end)
+ n = n->rb_right;
+ else
+ return s;
+ }
+
+ return NULL;
+}
+
+struct symbol_name_rb_node {
+ struct rb_node rb_node;
+ struct symbol sym;
+};
+
+static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
+{
+ struct rb_node **p = &symbols->rb_node;
+ struct rb_node *parent = NULL;
+ struct symbol_name_rb_node *symn, *s;
+
+ symn = container_of(sym, struct symbol_name_rb_node, sym);
+
+ while (*p != NULL) {
+ parent = *p;
+ s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
+ if (strcmp(sym->name, s->sym.name) < 0)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+ }
+ rb_link_node(&symn->rb_node, parent, p);
+ rb_insert_color(&symn->rb_node, symbols);
+}
+
+static void symbols__sort_by_name(struct rb_root *symbols,
+ struct rb_root *source)
+{
+ struct rb_node *nd;
+
+ for (nd = rb_first(source); nd; nd = rb_next(nd)) {
+ struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
+ symbols__insert_by_name(symbols, pos);
+ }
+}
+
+static struct symbol *symbols__find_by_name(struct rb_root *symbols,
+ const char *name)
+{
+ struct rb_node *n;
+
+ if (symbols == NULL)
+ return NULL;
+
+ n = symbols->rb_node;
+
+ while (n) {
+ struct symbol_name_rb_node *s;
+ int cmp;
+
+ s = rb_entry(n, struct symbol_name_rb_node, rb_node);
+ cmp = strcmp(name, s->sym.name);
+
+ if (cmp < 0)
+ n = n->rb_left;
+ else if (cmp > 0)
+ n = n->rb_right;
+ else
+ return &s->sym;
+ }
+
+ return NULL;
+}
+
+struct symbol *dso__find_symbol(struct dso *dso,
+ enum map_type type, u64 addr)
+{
+ return symbols__find(&dso->symbols[type], addr);
+}
+
+struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
+ const char *name)
+{
+ return symbols__find_by_name(&dso->symbol_names[type], name);
+}
+
+void dso__sort_by_name(struct dso *dso, enum map_type type)
+{
+ dso__set_sorted_by_name(dso, type);
+ return symbols__sort_by_name(&dso->symbol_names[type],
+ &dso->symbols[type]);
+}
+
+int build_id__sprintf(const u8 *build_id, int len, char *bf)
+{
+ char *bid = bf;
+ const u8 *raw = build_id;
+ int i;
+
+ for (i = 0; i < len; ++i) {
+ sprintf(bid, "%02x", *raw);
+ ++raw;
+ bid += 2;
+ }
+
+ return raw - build_id;
+}
+
+size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
+{
+ char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+
+ build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
+ return fprintf(fp, "%s", sbuild_id);
+}
+
+size_t dso__fprintf_symbols_by_name(struct dso *dso,
+ enum map_type type, FILE *fp)
+{
+ size_t ret = 0;
+ struct rb_node *nd;
+ struct symbol_name_rb_node *pos;
+
+ for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
+ pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
+ fprintf(fp, "%s\n", pos->sym.name);
+ }
+
+ return ret;
+}
+
+size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp)
+{
+ struct rb_node *nd;
+ size_t ret = fprintf(fp, "dso: %s (", dso->short_name);
+
+ if (dso->short_name != dso->long_name)
+ ret += fprintf(fp, "%s, ", dso->long_name);
+ ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
+ dso->loaded ? "" : "NOT ");
+ ret += dso__fprintf_buildid(dso, fp);
+ ret += fprintf(fp, ")\n");
+ for (nd = rb_first(&dso->symbols[type]); nd; nd = rb_next(nd)) {
+ struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
+ ret += symbol__fprintf(pos, fp);
+ }
+
+ return ret;
+}
+
+int kallsyms__parse(const char *filename, void *arg,
+ int (*process_symbol)(void *arg, const char *name,
+ char type, u64 start, u64 end))
+{
+ char *line = NULL;
+ size_t n;
+ int err = -1;
+ u64 prev_start = 0;
+ char prev_symbol_type = 0;
+ char *prev_symbol_name;
+ FILE *file = fopen(filename, "r");
+
+ if (file == NULL)
+ goto out_failure;
+
+ prev_symbol_name = malloc(KSYM_NAME_LEN);
+ if (prev_symbol_name == NULL)
+ goto out_close;
+
+ err = 0;
+
+ while (!feof(file)) {
+ u64 start;
+ int line_len, len;
+ char symbol_type;
+ char *symbol_name;
+
+ line_len = getline(&line, &n, file);
+ if (line_len < 0 || !line)
+ break;
+
+ line[--line_len] = '\0'; /* \n */
+
+ len = hex2u64(line, &start);
+
+ len++;
+ if (len + 2 >= line_len)
+ continue;
+
+ symbol_type = toupper(line[len]);
+ len += 2;
+ symbol_name = line + len;
+ len = line_len - len;
+
+ if (len >= KSYM_NAME_LEN) {
+ err = -1;
+ break;
+ }
+
+ if (prev_symbol_type) {
+ u64 end = start;
+ if (end != prev_start)
+ --end;
+ err = process_symbol(arg, prev_symbol_name,
+ prev_symbol_type, prev_start, end);
+ if (err)
+ break;
+ }
+
+ memcpy(prev_symbol_name, symbol_name, len + 1);
+ prev_symbol_type = symbol_type;
+ prev_start = start;
+ }
+
+ free(prev_symbol_name);
+ free(line);
+out_close:
+ fclose(file);
+ return err;
+
+out_failure:
+ return -1;
+}
+
+struct process_kallsyms_args {
+ struct map *map;
+ struct dso *dso;
+};
+
+static u8 kallsyms2elf_type(char type)
+{
+ if (type == 'W')
+ return STB_WEAK;
+
+ return isupper(type) ? STB_GLOBAL : STB_LOCAL;
+}
+
+static int map__process_kallsym_symbol(void *arg, const char *name,
+ char type, u64 start, u64 end)
+{
+ struct symbol *sym;
+ struct process_kallsyms_args *a = arg;
+ struct rb_root *root = &a->dso->symbols[a->map->type];
+
+ if (!symbol_type__is_a(type, a->map->type))
+ return 0;
+
+ sym = symbol__new(start, end - start + 1,
+ kallsyms2elf_type(type), name);
+ if (sym == NULL)
+ return -ENOMEM;
+ /*
+ * We will pass the symbols to the filter later, in
+ * map__split_kallsyms, when we have split the maps per module
+ */
+ symbols__insert(root, sym);
+
+ return 0;
+}
+
+/*
+ * Loads the function entries in /proc/kallsyms into kernel_map->dso,
+ * so that we can in the next step set the symbol ->end address and then
+ * call kernel_maps__split_kallsyms.
+ */
+static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
+ struct map *map)
+{
+ struct process_kallsyms_args args = { .map = map, .dso = dso, };
+ return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
+}
+
+/*
+ * Split the symbols into maps, making sure there are no overlaps, i.e. the
+ * kernel range is broken in several maps, named [kernel].N, as we don't have
+ * the original ELF section names vmlinux have.
+ */
+static int dso__split_kallsyms(struct dso *dso, struct map *map,
+ symbol_filter_t filter)
+{
+ struct map_groups *kmaps = map__kmap(map)->kmaps;
+ struct machine *machine = kmaps->machine;
+ struct map *curr_map = map;
+ struct symbol *pos;
+ int count = 0, moved = 0;
+ struct rb_root *root = &dso->symbols[map->type];
+ struct rb_node *next = rb_first(root);
+ int kernel_range = 0;
+
+ while (next) {
+ char *module;
+
+ pos = rb_entry(next, struct symbol, rb_node);
+ next = rb_next(&pos->rb_node);
+
+ module = strchr(pos->name, '\t');
+ if (module) {
+ if (!symbol_conf.use_modules)
+ goto discard_symbol;
+
+ *module++ = '\0';
+
+ if (strcmp(curr_map->dso->short_name, module)) {
+ if (curr_map != map &&
+ dso->kernel == DSO_TYPE_GUEST_KERNEL &&
+ machine__is_default_guest(machine)) {
+ /*
+ * We assume all symbols of a module are
+ * continuous in * kallsyms, so curr_map
+ * points to a module and all its
+ * symbols are in its kmap. Mark it as
+ * loaded.
+ */
+ dso__set_loaded(curr_map->dso,
+ curr_map->type);
+ }
+
+ curr_map = map_groups__find_by_name(kmaps,
+ map->type, module);
+ if (curr_map == NULL) {
+ pr_debug("%s/proc/{kallsyms,modules} "
+ "inconsistency while looking "
+ "for \"%s\" module!\n",
+ machine->root_dir, module);
+ curr_map = map;
+ goto discard_symbol;
+ }
+
+ if (curr_map->dso->loaded &&
+ !machine__is_default_guest(machine))
+ goto discard_symbol;
+ }
+ /*
+ * So that we look just like we get from .ko files,
+ * i.e. not prelinked, relative to map->start.
+ */
+ pos->start = curr_map->map_ip(curr_map, pos->start);
+ pos->end = curr_map->map_ip(curr_map, pos->end);
+ } else if (curr_map != map) {
+ char dso_name[PATH_MAX];
+ struct dso *ndso;
+
+ if (count == 0) {
+ curr_map = map;
+ goto filter_symbol;
+ }
+
+ if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+ snprintf(dso_name, sizeof(dso_name),
+ "[guest.kernel].%d",
+ kernel_range++);
+ else
+ snprintf(dso_name, sizeof(dso_name),
+ "[kernel].%d",
+ kernel_range++);
+
+ ndso = dso__new(dso_name);
+ if (ndso == NULL)
+ return -1;
+
+ ndso->kernel = dso->kernel;
+
+ curr_map = map__new2(pos->start, ndso, map->type);
+ if (curr_map == NULL) {
+ dso__delete(ndso);
+ return -1;
+ }
+
+ curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
+ map_groups__insert(kmaps, curr_map);
+ ++kernel_range;
+ }
+filter_symbol:
+ if (filter && filter(curr_map, pos)) {
+discard_symbol: rb_erase(&pos->rb_node, root);
+ symbol__delete(pos);
+ } else {
+ if (curr_map != map) {
+ rb_erase(&pos->rb_node, root);
+ symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
+ ++moved;
+ } else
+ ++count;
+ }
+ }
+
+ if (curr_map != map &&
+ dso->kernel == DSO_TYPE_GUEST_KERNEL &&
+ machine__is_default_guest(kmaps->machine)) {
+ dso__set_loaded(curr_map->dso, curr_map->type);
+ }
+
+ return count + moved;
+}
+
+static bool symbol__restricted_filename(const char *filename,
+ const char *restricted_filename)
+{
+ bool restricted = false;
+
+ if (symbol_conf.kptr_restrict) {
+ char *r = realpath(filename, NULL);
+
+ if (r != NULL) {
+ restricted = strcmp(r, restricted_filename) == 0;
+ free(r);
+ return restricted;
+ }
+ }
+
+ return restricted;
+}
+
+int dso__load_kallsyms(struct dso *dso, const char *filename,
+ struct map *map, symbol_filter_t filter)
+{
+ if (symbol__restricted_filename(filename, "/proc/kallsyms"))
+ return -1;
+
+ if (dso__load_all_kallsyms(dso, filename, map) < 0)
+ return -1;
+
+ if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+ dso->symtab_type = SYMTAB__GUEST_KALLSYMS;
+ else
+ dso->symtab_type = SYMTAB__KALLSYMS;
+
+ return dso__split_kallsyms(dso, map, filter);
+}
+
+static int dso__load_perf_map(struct dso *dso, struct map *map,
+ symbol_filter_t filter)
+{
+ char *line = NULL;
+ size_t n;
+ FILE *file;
+ int nr_syms = 0;
+
+ file = fopen(dso->long_name, "r");
+ if (file == NULL)
+ goto out_failure;
+
+ while (!feof(file)) {
+ u64 start, size;
+ struct symbol *sym;
+ int line_len, len;
+
+ line_len = getline(&line, &n, file);
+ if (line_len < 0)
+ break;
+
+ if (!line)
+ goto out_failure;
+
+ line[--line_len] = '\0'; /* \n */
+
+ len = hex2u64(line, &start);
+
+ len++;
+ if (len + 2 >= line_len)
+ continue;
+
+ len += hex2u64(line + len, &size);
+
+ len++;
+ if (len + 2 >= line_len)
+ continue;
+
+ sym = symbol__new(start, size, STB_GLOBAL, line + len);
+
+ if (sym == NULL)
+ goto out_delete_line;
+
+ if (filter && filter(map, sym))
+ symbol__delete(sym);
+ else {
+ symbols__insert(&dso->symbols[map->type], sym);
+ nr_syms++;
+ }
+ }
+
+ free(line);
+ fclose(file);
+
+ return nr_syms;
+
+out_delete_line:
+ free(line);
+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, 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;
+ char name[PATH_MAX];
+
+ snprintf(name, sizeof(name), "%s%s",
+ symbol_conf.symfs, dso->long_name);
+ 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__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;
+ }
+
+ /* 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) != BUILD_ID_SIZE)
+ 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 = *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_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;
+}
+
+static bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
+{
+ return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
+}
+
+bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
+{
+ bool have_build_id = false;
+ struct dso *pos;
+
+ list_for_each_entry(pos, head, node) {
+ if (with_hits && !pos->hit)
+ continue;
+ if (pos->has_build_id) {
+ have_build_id = true;
+ continue;
+ }
+ if (filename__read_build_id(pos->long_name, pos->build_id,
+ sizeof(pos->build_id)) > 0) {
+ have_build_id = true;
+ pos->has_build_id = true;
+ }
+ }
+
+ 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;
+ }
+
+ sec = elf_section_by_name(elf, &ehdr, &shdr,
+ ".note.gnu.build-id", NULL);
+ if (sec == NULL) {
+ sec = elf_section_by_name(elf, &ehdr, &shdr,
+ ".notes", NULL);
+ if (sec == NULL)
+ goto out;
+ }
+
+ 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;
+ int 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) {
+ memcpy(bf, ptr, BUILD_ID_SIZE);
+ err = BUILD_ID_SIZE;
+ 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;
+ int 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) != namesz)
+ break;
+ if (memcmp(bf, "GNU", sizeof("GNU")) == 0) {
+ if (read(fd, build_id,
+ BUILD_ID_SIZE) == BUILD_ID_SIZE) {
+ err = 0;
+ break;
+ }
+ } else if (read(fd, bf, descsz) != descsz)
+ break;
+ } else {
+ int n = namesz + descsz;
+ if (read(fd, bf, n) != n)
+ break;
+ }
+ }
+ close(fd);
+out:
+ return err;
+}
+
+char dso__symtab_origin(const struct dso *dso)
+{
+ static const char origin[] = {
+ [SYMTAB__KALLSYMS] = 'k',
+ [SYMTAB__JAVA_JIT] = 'j',
+ [SYMTAB__BUILD_ID_CACHE] = 'B',
+ [SYMTAB__FEDORA_DEBUGINFO] = 'f',
+ [SYMTAB__UBUNTU_DEBUGINFO] = 'u',
+ [SYMTAB__BUILDID_DEBUGINFO] = 'b',
+ [SYMTAB__SYSTEM_PATH_DSO] = 'd',
+ [SYMTAB__SYSTEM_PATH_KMODULE] = 'K',
+ [SYMTAB__GUEST_KALLSYMS] = 'g',
+ [SYMTAB__GUEST_KMODULE] = 'G',
+ };
+
+ if (dso == NULL || dso->symtab_type == SYMTAB__NOT_FOUND)
+ return '!';
+ return origin[dso->symtab_type];
+}
+
+int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
+{
+ int size = PATH_MAX;
+ char *name;
+ int ret = -1;
+ int fd;
+ struct machine *machine;
+ const char *root_dir;
+ int want_symtab;
+
+ dso__set_loaded(dso, map->type);
+
+ if (dso->kernel == DSO_TYPE_KERNEL)
+ return dso__load_kernel_sym(dso, map, filter);
+ else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+ return dso__load_guest_kernel_sym(dso, map, filter);
+
+ if (map->groups && map->groups->machine)
+ machine = map->groups->machine;
+ else
+ machine = NULL;
+
+ name = malloc(size);
+ if (!name)
+ return -1;
+
+ dso->adjust_symbols = 0;
+
+ if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
+ ret = dso__load_perf_map(dso, map, filter);
+ dso->symtab_type = ret > 0 ? SYMTAB__JAVA_JIT :
+ SYMTAB__NOT_FOUND;
+ return ret;
+ }
+
+ /* Iterate over candidate debug images.
+ * On the first pass, only load images if they have a full symtab.
+ * Failing that, do a second pass where we accept .dynsym also
+ */
+ want_symtab = 1;
+restart:
+ for (dso->symtab_type = SYMTAB__BUILD_ID_CACHE;
+ dso->symtab_type != SYMTAB__NOT_FOUND;
+ dso->symtab_type++) {
+ switch (dso->symtab_type) {
+ case SYMTAB__BUILD_ID_CACHE:
+ /* skip the locally configured cache if a symfs is given */
+ if (symbol_conf.symfs[0] ||
+ (dso__build_id_filename(dso, name, size) == NULL)) {
+ continue;
+ }
+ break;
+ case SYMTAB__FEDORA_DEBUGINFO:
+ snprintf(name, size, "%s/usr/lib/debug%s.debug",
+ symbol_conf.symfs, dso->long_name);
+ break;
+ case SYMTAB__UBUNTU_DEBUGINFO:
+ snprintf(name, size, "%s/usr/lib/debug%s",
+ symbol_conf.symfs, dso->long_name);
+ break;
+ case SYMTAB__BUILDID_DEBUGINFO: {
+ char build_id_hex[BUILD_ID_SIZE * 2 + 1];
+
+ if (!dso->has_build_id)
+ continue;
+
+ build_id__sprintf(dso->build_id,
+ sizeof(dso->build_id),
+ build_id_hex);
+ snprintf(name, size,
+ "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
+ symbol_conf.symfs, build_id_hex, build_id_hex + 2);
+ }
+ break;
+ case SYMTAB__SYSTEM_PATH_DSO:
+ snprintf(name, size, "%s%s",
+ symbol_conf.symfs, dso->long_name);
+ break;
+ case SYMTAB__GUEST_KMODULE:
+ if (map->groups && machine)
+ root_dir = machine->root_dir;
+ else
+ root_dir = "";
+ snprintf(name, size, "%s%s%s", symbol_conf.symfs,
+ root_dir, dso->long_name);
+ break;
+
+ case SYMTAB__SYSTEM_PATH_KMODULE:
+ snprintf(name, size, "%s%s", symbol_conf.symfs,
+ dso->long_name);
+ break;
+ default:;
+ }
+
+ /* Name is now the name of the next image to try */
+ fd = open(name, O_RDONLY);
+ if (fd < 0)
+ continue;
+
+ ret = dso__load_sym(dso, map, name, fd, filter, 0,
+ want_symtab);
+ close(fd);
+
+ /*
+ * Some people seem to have debuginfo files _WITHOUT_ debug
+ * info!?!?
+ */
+ if (!ret)
+ continue;
+
+ if (ret > 0) {
+ int nr_plt = dso__synthesize_plt_symbols(dso, map,
+ filter);
+ if (nr_plt > 0)
+ ret += nr_plt;
+ break;
+ }
+ }
+
+ /*
+ * If we wanted a full symtab but no image had one,
+ * relax our requirements and repeat the search.
+ */
+ if (ret <= 0 && want_symtab) {
+ want_symtab = 0;
+ goto restart;
+ }
+
+ free(name);
+ if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
+ return 0;
+ return ret;
+}
+
+struct map *map_groups__find_by_name(struct map_groups *mg,
+ enum map_type type, const char *name)
+{
+ struct rb_node *nd;
+
+ for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
+ struct map *map = rb_entry(nd, struct map, rb_node);
+
+ if (map->dso && strcmp(map->dso->short_name, name) == 0)
+ return map;
+ }
+
+ return NULL;
+}
+
+static int dso__kernel_module_get_build_id(struct dso *dso,
+ const char *root_dir)
+{
+ char filename[PATH_MAX];
+ /*
+ * kernel module short names are of the form "[module]" and
+ * we need just "module" here.
+ */
+ const char *name = dso->short_name + 1;
+
+ snprintf(filename, sizeof(filename),
+ "%s/sys/module/%.*s/notes/.note.gnu.build-id",
+ root_dir, (int)strlen(name) - 1, name);
+
+ if (sysfs__read_build_id(filename, dso->build_id,
+ sizeof(dso->build_id)) == 0)
+ dso->has_build_id = true;
+
+ return 0;
+}
+
+static int map_groups__set_modules_path_dir(struct map_groups *mg,
+ const char *dir_name)
+{
+ struct dirent *dent;
+ DIR *dir = opendir(dir_name);
+ int ret = 0;
+
+ if (!dir) {
+ pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
+ return -1;
+ }
+
+ while ((dent = readdir(dir)) != NULL) {
+ char path[PATH_MAX];
+ struct stat st;
+
+ /*sshfs might return bad dent->d_type, so we have to stat*/
+ sprintf(path, "%s/%s", dir_name, dent->d_name);
+ if (stat(path, &st))
+ continue;
+
+ if (S_ISDIR(st.st_mode)) {
+ if (!strcmp(dent->d_name, ".") ||
+ !strcmp(dent->d_name, ".."))
+ continue;
+
+ snprintf(path, sizeof(path), "%s/%s",
+ dir_name, dent->d_name);
+ ret = map_groups__set_modules_path_dir(mg, path);
+ if (ret < 0)
+ goto out;
+ } else {
+ char *dot = strrchr(dent->d_name, '.'),
+ dso_name[PATH_MAX];
+ struct map *map;
+ char *long_name;
+
+ if (dot == NULL || strcmp(dot, ".ko"))
+ continue;
+ snprintf(dso_name, sizeof(dso_name), "[%.*s]",
+ (int)(dot - dent->d_name), dent->d_name);
+
+ strxfrchar(dso_name, '-', '_');
+ map = map_groups__find_by_name(mg, MAP__FUNCTION,
+ dso_name);
+ if (map == NULL)
+ continue;
+
+ snprintf(path, sizeof(path), "%s/%s",
+ dir_name, dent->d_name);
+
+ long_name = strdup(path);
+ if (long_name == NULL) {
+ ret = -1;
+ goto out;
+ }
+ dso__set_long_name(map->dso, long_name);
+ map->dso->lname_alloc = 1;
+ dso__kernel_module_get_build_id(map->dso, "");
+ }
+ }
+
+out:
+ closedir(dir);
+ return ret;
+}
+
+static char *get_kernel_version(const char *root_dir)
+{
+ char version[PATH_MAX];
+ FILE *file;
+ char *name, *tmp;
+ const char *prefix = "Linux version ";
+
+ sprintf(version, "%s/proc/version", root_dir);
+ file = fopen(version, "r");
+ if (!file)
+ return NULL;
+
+ version[0] = '\0';
+ tmp = fgets(version, sizeof(version), file);
+ fclose(file);
+
+ name = strstr(version, prefix);
+ if (!name)
+ return NULL;
+ name += strlen(prefix);
+ tmp = strchr(name, ' ');
+ if (tmp)
+ *tmp = '\0';
+
+ return strdup(name);
+}
+
+static int machine__set_modules_path(struct machine *machine)
+{
+ char *version;
+ char modules_path[PATH_MAX];
+
+ version = get_kernel_version(machine->root_dir);
+ if (!version)
+ return -1;
+
+ snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
+ machine->root_dir, version);
+ free(version);
+
+ 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)
+{
+ struct map *map;
+ struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
+
+ if (dso == NULL)
+ return NULL;
+
+ map = map__new2(start, dso, MAP__FUNCTION);
+ if (map == NULL)
+ return NULL;
+
+ if (machine__is_host(machine))
+ dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE;
+ else
+ dso->symtab_type = SYMTAB__GUEST_KMODULE;
+ map_groups__insert(&machine->kmaps, map);
+ return map;
+}
+
+static int machine__create_modules(struct machine *machine)
+{
+ char *line = NULL;
+ size_t n;
+ FILE *file;
+ struct map *map;
+ const char *modules;
+ char path[PATH_MAX];
+
+ if (machine__is_default_guest(machine))
+ modules = symbol_conf.default_guest_modules;
+ else {
+ sprintf(path, "%s/proc/modules", machine->root_dir);
+ modules = path;
+ }
+
+ if (symbol__restricted_filename(path, "/proc/modules"))
+ return -1;
+
+ file = fopen(modules, "r");
+ if (file == NULL)
+ return -1;
+
+ while (!feof(file)) {
+ char name[PATH_MAX];
+ u64 start;
+ char *sep;
+ int line_len;
+
+ line_len = getline(&line, &n, file);
+ if (line_len < 0)
+ break;
+
+ if (!line)
+ goto out_failure;
+
+ line[--line_len] = '\0'; /* \n */
+
+ sep = strrchr(line, 'x');
+ if (sep == NULL)
+ continue;
+
+ hex2u64(sep + 1, &start);
+
+ sep = strchr(line, ' ');
+ if (sep == NULL)
+ continue;
+
+ *sep = '\0';
+
+ snprintf(name, sizeof(name), "[%s]", line);
+ map = machine__new_module(machine, start, name);
+ if (map == NULL)
+ goto out_delete_line;
+ dso__kernel_module_get_build_id(map->dso, machine->root_dir);
+ }
+
+ free(line);
+ fclose(file);
+
+ return machine__set_modules_path(machine);
+
+out_delete_line:
+ free(line);
+out_failure:
+ return -1;
+}
+
+int dso__load_vmlinux(struct dso *dso, struct map *map,
+ const char *vmlinux, symbol_filter_t filter)
+{
+ int err = -1, fd;
+ char symfs_vmlinux[PATH_MAX];
+
+ snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
+ symbol_conf.symfs, vmlinux);
+ fd = open(symfs_vmlinux, O_RDONLY);
+ if (fd < 0)
+ return -1;
+
+ dso__set_long_name(dso, (char *)vmlinux);
+ dso__set_loaded(dso, map->type);
+ err = dso__load_sym(dso, map, symfs_vmlinux, fd, filter, 0, 0);
+ close(fd);
+
+ if (err > 0)
+ pr_debug("Using %s for symbols\n", symfs_vmlinux);
+
+ return err;
+}
+
+int dso__load_vmlinux_path(struct dso *dso, struct map *map,
+ symbol_filter_t filter)
+{
+ int i, err = 0;
+ char *filename;
+
+ pr_debug("Looking at the vmlinux_path (%d entries long)\n",
+ vmlinux_path__nr_entries + 1);
+
+ filename = dso__build_id_filename(dso, NULL, 0);
+ if (filename != NULL) {
+ err = dso__load_vmlinux(dso, map, filename, filter);
+ if (err > 0) {
+ dso__set_long_name(dso, filename);
+ goto out;
+ }
+ free(filename);
+ }
+
+ for (i = 0; i < vmlinux_path__nr_entries; ++i) {
+ err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter);
+ if (err > 0) {
+ dso__set_long_name(dso, strdup(vmlinux_path[i]));
+ break;
+ }
+ }
+out:
+ return err;
+}
+
+static int dso__load_kernel_sym(struct dso *dso, struct map *map,
+ symbol_filter_t filter)
+{
+ int err;
+ const char *kallsyms_filename = NULL;
+ char *kallsyms_allocated_filename = NULL;
+ /*
+ * Step 1: if the user specified a kallsyms or vmlinux filename, use
+ * it and only it, reporting errors to the user if it cannot be used.
+ *
+ * For instance, try to analyse an ARM perf.data file _without_ a
+ * build-id, or if the user specifies the wrong path to the right
+ * vmlinux file, obviously we can't fallback to another vmlinux (a
+ * x86_86 one, on the machine where analysis is being performed, say),
+ * or worse, /proc/kallsyms.
+ *
+ * If the specified file _has_ a build-id and there is a build-id
+ * section in the perf.data file, we will still do the expected
+ * validation in dso__load_vmlinux and will bail out if they don't
+ * match.
+ */
+ if (symbol_conf.kallsyms_name != NULL) {
+ kallsyms_filename = symbol_conf.kallsyms_name;
+ goto do_kallsyms;
+ }
+
+ if (symbol_conf.vmlinux_name != NULL) {
+ err = dso__load_vmlinux(dso, map,
+ symbol_conf.vmlinux_name, filter);
+ if (err > 0) {
+ dso__set_long_name(dso,
+ strdup(symbol_conf.vmlinux_name));
+ goto out_fixup;
+ }
+ return err;
+ }
+
+ if (vmlinux_path != NULL) {
+ err = dso__load_vmlinux_path(dso, map, filter);
+ if (err > 0)
+ goto out_fixup;
+ }
+
+ /* do not try local files if a symfs was given */
+ if (symbol_conf.symfs[0] != 0)
+ return -1;
+
+ /*
+ * Say the kernel DSO was created when processing the build-id header table,
+ * we have a build-id, so check if it is the same as the running kernel,
+ * using it if it is.
+ */
+ if (dso->has_build_id) {
+ u8 kallsyms_build_id[BUILD_ID_SIZE];
+ char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+
+ if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
+ sizeof(kallsyms_build_id)) == 0) {
+ if (dso__build_id_equal(dso, kallsyms_build_id)) {
+ kallsyms_filename = "/proc/kallsyms";
+ goto do_kallsyms;
+ }
+ }
+ /*
+ * Now look if we have it on the build-id cache in
+ * $HOME/.debug/[kernel.kallsyms].
+ */
+ build_id__sprintf(dso->build_id, sizeof(dso->build_id),
+ sbuild_id);
+
+ if (asprintf(&kallsyms_allocated_filename,
+ "%s/.debug/[kernel.kallsyms]/%s",
+ getenv("HOME"), sbuild_id) == -1) {
+ pr_err("Not enough memory for kallsyms file lookup\n");
+ return -1;
+ }
+
+ kallsyms_filename = kallsyms_allocated_filename;
+
+ if (access(kallsyms_filename, F_OK)) {
+ pr_err("No kallsyms or vmlinux with build-id %s "
+ "was found\n", sbuild_id);
+ free(kallsyms_allocated_filename);
+ return -1;
+ }
+ } else {
+ /*
+ * Last resort, if we don't have a build-id and couldn't find
+ * any vmlinux file, try the running kernel kallsyms table.
+ */
+ kallsyms_filename = "/proc/kallsyms";
+ }
+
+do_kallsyms:
+ err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
+ if (err > 0)
+ pr_debug("Using %s for symbols\n", kallsyms_filename);
+ free(kallsyms_allocated_filename);
+
+ if (err > 0) {
+out_fixup:
+ if (kallsyms_filename != NULL)
+ dso__set_long_name(dso, strdup("[kernel.kallsyms]"));
+ map__fixup_start(map);
+ map__fixup_end(map);
+ }
+
+ return err;
+}
+
+static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
+ symbol_filter_t filter)
+{
+ int err;
+ const char *kallsyms_filename = NULL;
+ struct machine *machine;
+ char path[PATH_MAX];
+
+ if (!map->groups) {
+ pr_debug("Guest kernel map hasn't the point to groups\n");
+ return -1;
+ }
+ machine = map->groups->machine;
+
+ if (machine__is_default_guest(machine)) {
+ /*
+ * if the user specified a vmlinux filename, use it and only
+ * it, reporting errors to the user if it cannot be used.
+ * Or use file guest_kallsyms inputted by user on commandline
+ */
+ if (symbol_conf.default_guest_vmlinux_name != NULL) {
+ err = dso__load_vmlinux(dso, map,
+ symbol_conf.default_guest_vmlinux_name, filter);
+ goto out_try_fixup;
+ }
+
+ kallsyms_filename = symbol_conf.default_guest_kallsyms;
+ if (!kallsyms_filename)
+ return -1;
+ } else {
+ sprintf(path, "%s/proc/kallsyms", machine->root_dir);
+ kallsyms_filename = path;
+ }
+
+ err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
+ if (err > 0)
+ pr_debug("Using %s for symbols\n", kallsyms_filename);
+
+out_try_fixup:
+ if (err > 0) {
+ if (kallsyms_filename != NULL) {
+ machine__mmap_name(machine, path, sizeof(path));
+ dso__set_long_name(dso, strdup(path));
+ }
+ map__fixup_start(map);
+ map__fixup_end(map);
+ }
+
+ return err;
+}
+
+static void dsos__add(struct list_head *head, struct dso *dso)
+{
+ list_add_tail(&dso->node, head);
+}
+
+static struct dso *dsos__find(struct list_head *head, const char *name)
+{
+ struct dso *pos;
+
+ list_for_each_entry(pos, head, node)
+ if (strcmp(pos->long_name, name) == 0)
+ return pos;
+ return NULL;
+}
+
+struct dso *__dsos__findnew(struct list_head *head, const char *name)
+{
+ struct dso *dso = dsos__find(head, name);
+
+ if (!dso) {
+ dso = dso__new(name);
+ if (dso != NULL) {
+ dsos__add(head, dso);
+ dso__set_basename(dso);
+ }
+ }
+
+ return dso;
+}
+
+size_t __dsos__fprintf(struct list_head *head, FILE *fp)
+{
+ struct dso *pos;
+ size_t ret = 0;
+
+ list_for_each_entry(pos, head, node) {
+ int i;
+ for (i = 0; i < MAP__NR_TYPES; ++i)
+ ret += dso__fprintf(pos, i, fp);
+ }
+
+ return ret;
+}
+
+size_t machines__fprintf_dsos(struct rb_root *machines, FILE *fp)
+{
+ struct rb_node *nd;
+ size_t ret = 0;
+
+ for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
+ struct machine *pos = rb_entry(nd, struct machine, rb_node);
+ ret += __dsos__fprintf(&pos->kernel_dsos, fp);
+ ret += __dsos__fprintf(&pos->user_dsos, fp);
+ }
+
+ return ret;
+}
+
+static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
+ bool with_hits)
+{
+ struct dso *pos;
+ size_t ret = 0;
+
+ list_for_each_entry(pos, head, node) {
+ if (with_hits && !pos->hit)
+ continue;
+ ret += dso__fprintf_buildid(pos, fp);
+ ret += fprintf(fp, " %s\n", pos->long_name);
+ }
+ return ret;
+}
+
+size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
+ bool with_hits)
+{
+ return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, with_hits) +
+ __dsos__fprintf_buildid(&machine->user_dsos, fp, with_hits);
+}
+
+size_t machines__fprintf_dsos_buildid(struct rb_root *machines,
+ FILE *fp, bool with_hits)
+{
+ struct rb_node *nd;
+ size_t ret = 0;
+
+ for (nd = rb_first(machines); nd; nd = rb_next(nd)) {
+ struct machine *pos = rb_entry(nd, struct machine, rb_node);
+ ret += machine__fprintf_dsos_buildid(pos, fp, with_hits);
+ }
+ return ret;
+}
+
+struct dso *dso__new_kernel(const char *name)
+{
+ struct dso *dso = dso__new(name ?: "[kernel.kallsyms]");
+
+ if (dso != NULL) {
+ dso__set_short_name(dso, "[kernel]");
+ dso->kernel = DSO_TYPE_KERNEL;
+ }
+
+ return dso;
+}
+
+static struct dso *dso__new_guest_kernel(struct machine *machine,
+ const char *name)
+{
+ char bf[PATH_MAX];
+ struct dso *dso = dso__new(name ?: machine__mmap_name(machine, bf,
+ sizeof(bf)));
+ if (dso != NULL) {
+ dso__set_short_name(dso, "[guest.kernel]");
+ dso->kernel = DSO_TYPE_GUEST_KERNEL;
+ }
+
+ return dso;
+}
+
+void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
+{
+ char path[PATH_MAX];
+
+ if (machine__is_default_guest(machine))
+ return;
+ sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
+ if (sysfs__read_build_id(path, dso->build_id,
+ sizeof(dso->build_id)) == 0)
+ dso->has_build_id = true;
+}
+
+static struct dso *machine__create_kernel(struct machine *machine)
+{
+ const char *vmlinux_name = NULL;
+ struct dso *kernel;
+
+ if (machine__is_host(machine)) {
+ vmlinux_name = symbol_conf.vmlinux_name;
+ kernel = dso__new_kernel(vmlinux_name);
+ } else {
+ if (machine__is_default_guest(machine))
+ vmlinux_name = symbol_conf.default_guest_vmlinux_name;
+ kernel = dso__new_guest_kernel(machine, vmlinux_name);
+ }
+
+ if (kernel != NULL) {
+ dso__read_running_kernel_build_id(kernel, machine);
+ dsos__add(&machine->kernel_dsos, kernel);
+ }
+ return kernel;
+}
+
+struct process_args {
+ u64 start;
+};
+
+static int symbol__in_kernel(void *arg, const char *name,
+ char type __used, u64 start, u64 end __used)
+{
+ struct process_args *args = arg;
+
+ if (strchr(name, '['))
+ return 0;
+
+ args->start = start;
+ return 1;
+}
+
+/* Figure out the start address of kernel map from /proc/kallsyms */
+static u64 machine__get_kernel_start_addr(struct machine *machine)
+{
+ const char *filename;
+ char path[PATH_MAX];
+ struct process_args args;
+
+ if (machine__is_host(machine)) {
+ filename = "/proc/kallsyms";
+ } else {
+ if (machine__is_default_guest(machine))
+ filename = (char *)symbol_conf.default_guest_kallsyms;
+ else {
+ sprintf(path, "%s/proc/kallsyms", machine->root_dir);
+ filename = path;
+ }
+ }
+
+ if (symbol__restricted_filename(filename, "/proc/kallsyms"))
+ return 0;
+
+ if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
+ return 0;
+
+ return args.start;
+}
+
+int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
+{
+ enum map_type type;
+ u64 start = machine__get_kernel_start_addr(machine);
+
+ for (type = 0; type < MAP__NR_TYPES; ++type) {
+ struct kmap *kmap;
+
+ machine->vmlinux_maps[type] = map__new2(start, kernel, type);
+ if (machine->vmlinux_maps[type] == NULL)
+ return -1;
+
+ machine->vmlinux_maps[type]->map_ip =
+ machine->vmlinux_maps[type]->unmap_ip =
+ identity__map_ip;
+ kmap = map__kmap(machine->vmlinux_maps[type]);
+ kmap->kmaps = &machine->kmaps;
+ map_groups__insert(&machine->kmaps,
+ machine->vmlinux_maps[type]);
+ }
+
+ return 0;
+}
+
+void machine__destroy_kernel_maps(struct machine *machine)
+{
+ enum map_type type;
+
+ for (type = 0; type < MAP__NR_TYPES; ++type) {
+ struct kmap *kmap;
+
+ if (machine->vmlinux_maps[type] == NULL)
+ continue;
+
+ kmap = map__kmap(machine->vmlinux_maps[type]);
+ map_groups__remove(&machine->kmaps,
+ machine->vmlinux_maps[type]);
+ if (kmap->ref_reloc_sym) {
+ /*
+ * ref_reloc_sym is shared among all maps, so free just
+ * on one of them.
+ */
+ if (type == MAP__FUNCTION) {
+ free((char *)kmap->ref_reloc_sym->name);
+ kmap->ref_reloc_sym->name = NULL;
+ free(kmap->ref_reloc_sym);
+ }
+ kmap->ref_reloc_sym = NULL;
+ }
+
+ map__delete(machine->vmlinux_maps[type]);
+ machine->vmlinux_maps[type] = NULL;
+ }
+}
+
+int machine__create_kernel_maps(struct machine *machine)
+{
+ struct dso *kernel = machine__create_kernel(machine);
+
+ if (kernel == NULL ||
+ __machine__create_kernel_maps(machine, kernel) < 0)
+ return -1;
+
+ if (symbol_conf.use_modules && machine__create_modules(machine) < 0)
+ pr_debug("Problems creating module maps, continuing anyway...\n");
+ /*
+ * Now that we have all the maps created, just set the ->end of them:
+ */
+ map_groups__fixup_end(&machine->kmaps);
+ return 0;
+}
+
+static void vmlinux_path__exit(void)
+{
+ while (--vmlinux_path__nr_entries >= 0) {
+ free(vmlinux_path[vmlinux_path__nr_entries]);
+ vmlinux_path[vmlinux_path__nr_entries] = NULL;
+ }
+
+ free(vmlinux_path);
+ vmlinux_path = NULL;
+}
+
+static int vmlinux_path__init(void)
+{
+ struct utsname uts;
+ char bf[PATH_MAX];
+
+ vmlinux_path = malloc(sizeof(char *) * 5);
+ if (vmlinux_path == NULL)
+ return -1;
+
+ vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
+ if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
+ goto out_fail;
+ ++vmlinux_path__nr_entries;
+ vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
+ if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
+ goto out_fail;
+ ++vmlinux_path__nr_entries;
+
+ /* only try running kernel version if no symfs was given */
+ if (symbol_conf.symfs[0] != 0)
+ return 0;
+
+ if (uname(&uts) < 0)
+ return -1;
+
+ snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
+ vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
+ if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
+ goto out_fail;
+ ++vmlinux_path__nr_entries;
+ snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
+ vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
+ if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
+ goto out_fail;
+ ++vmlinux_path__nr_entries;
+ snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
+ uts.release);
+ vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
+ if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
+ goto out_fail;
+ ++vmlinux_path__nr_entries;
+
+ return 0;
+
+out_fail:
+ vmlinux_path__exit();
+ return -1;
+}
+
+size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
+{
+ int i;
+ size_t printed = 0;
+ struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
+
+ if (kdso->has_build_id) {
+ char filename[PATH_MAX];
+ if (dso__build_id_filename(kdso, filename, sizeof(filename)))
+ printed += fprintf(fp, "[0] %s\n", filename);
+ }
+
+ for (i = 0; i < vmlinux_path__nr_entries; ++i)
+ printed += fprintf(fp, "[%d] %s\n",
+ i + kdso->has_build_id, vmlinux_path[i]);
+
+ return printed;
+}
+
+static int setup_list(struct strlist **list, const char *list_str,
+ const char *list_name)
+{
+ if (list_str == NULL)
+ return 0;
+
+ *list = strlist__new(true, list_str);
+ if (!*list) {
+ pr_err("problems parsing %s list\n", list_name);
+ return -1;
+ }
+ return 0;
+}
+
+static bool symbol__read_kptr_restrict(void)
+{
+ bool value = false;
+
+ if (geteuid() != 0) {
+ FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
+ if (fp != NULL) {
+ char line[8];
+
+ if (fgets(line, sizeof(line), fp) != NULL)
+ value = atoi(line) != 0;
+
+ fclose(fp);
+ }
+ }
+
+ return value;
+}
+
+int symbol__init(void)
+{
+ const char *symfs;
+
+ if (symbol_conf.initialized)
+ return 0;
+
+ symbol_conf.priv_size = ALIGN(symbol_conf.priv_size, sizeof(u64));
+
+ elf_version(EV_CURRENT);
+ if (symbol_conf.sort_by_name)
+ symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
+ sizeof(struct symbol));
+
+ if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
+ return -1;
+
+ if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
+ pr_err("'.' is the only non valid --field-separator argument\n");
+ return -1;
+ }
+
+ if (setup_list(&symbol_conf.dso_list,
+ symbol_conf.dso_list_str, "dso") < 0)
+ return -1;
+
+ if (setup_list(&symbol_conf.comm_list,
+ symbol_conf.comm_list_str, "comm") < 0)
+ goto out_free_dso_list;
+
+ if (setup_list(&symbol_conf.sym_list,
+ symbol_conf.sym_list_str, "symbol") < 0)
+ goto out_free_comm_list;
+
+ /*
+ * A path to symbols of "/" is identical to ""
+ * reset here for simplicity.
+ */
+ symfs = realpath(symbol_conf.symfs, NULL);
+ if (symfs == NULL)
+ symfs = symbol_conf.symfs;
+ if (strcmp(symfs, "/") == 0)
+ symbol_conf.symfs = "";
+ if (symfs != symbol_conf.symfs)
+ free((void *)symfs);
+
+ symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
+
+ symbol_conf.initialized = true;
+ return 0;
+
+out_free_dso_list:
+ strlist__delete(symbol_conf.dso_list);
+out_free_comm_list:
+ strlist__delete(symbol_conf.comm_list);
+ return -1;
+}
+
+void symbol__exit(void)
+{
+ if (!symbol_conf.initialized)
+ return;
+ strlist__delete(symbol_conf.sym_list);
+ strlist__delete(symbol_conf.dso_list);
+ strlist__delete(symbol_conf.comm_list);
+ vmlinux_path__exit();
+ symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
+ symbol_conf.initialized = false;
+}
+
+int machines__create_kernel_maps(struct rb_root *machines, pid_t pid)
+{
+ struct machine *machine = machines__findnew(machines, pid);
+
+ if (machine == NULL)
+ return -1;
+
+ return machine__create_kernel_maps(machine);
+}
+
+static int hex(char ch)
+{
+ if ((ch >= '0') && (ch <= '9'))
+ return ch - '0';
+ if ((ch >= 'a') && (ch <= 'f'))
+ return ch - 'a' + 10;
+ if ((ch >= 'A') && (ch <= 'F'))
+ return ch - 'A' + 10;
+ return -1;
+}
+
+/*
+ * While we find nice hex chars, build a long_val.
+ * Return number of chars processed.
+ */
+int hex2u64(const char *ptr, u64 *long_val)
+{
+ const char *p = ptr;
+ *long_val = 0;
+
+ while (*p) {
+ const int hex_val = hex(*p);
+
+ if (hex_val < 0)
+ break;
+
+ *long_val = (*long_val << 4) | hex_val;
+ p++;
+ }
+
+ return p - ptr;
+}
+
+char *strxfrchar(char *s, char from, char to)
+{
+ char *p = s;
+
+ while ((p = strchr(p, from)) != NULL)
+ *p++ = to;
+
+ return s;
+}
+
+int machines__create_guest_kernel_maps(struct rb_root *machines)
+{
+ int ret = 0;
+ struct dirent **namelist = NULL;
+ int i, items = 0;
+ char path[PATH_MAX];
+ pid_t pid;
+
+ if (symbol_conf.default_guest_vmlinux_name ||
+ symbol_conf.default_guest_modules ||
+ symbol_conf.default_guest_kallsyms) {
+ machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
+ }
+
+ if (symbol_conf.guestmount) {
+ items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
+ if (items <= 0)
+ return -ENOENT;
+ for (i = 0; i < items; i++) {
+ if (!isdigit(namelist[i]->d_name[0])) {
+ /* Filter out . and .. */
+ continue;
+ }
+ pid = atoi(namelist[i]->d_name);
+ sprintf(path, "%s/%s/proc/kallsyms",
+ symbol_conf.guestmount,
+ namelist[i]->d_name);
+ ret = access(path, R_OK);
+ if (ret) {
+ pr_debug("Can't access file %s\n", path);
+ goto failure;
+ }
+ machines__create_kernel_maps(machines, pid);
+ }
+failure:
+ free(namelist);
+ }
+
+ return ret;
+}
+
+void machines__destroy_guest_kernel_maps(struct rb_root *machines)
+{
+ struct rb_node *next = rb_first(machines);
+
+ while (next) {
+ struct machine *pos = rb_entry(next, struct machine, rb_node);
+
+ next = rb_next(&pos->rb_node);
+ rb_erase(&pos->rb_node, machines);
+ machine__delete(pos);
+ }
+}
+
+int machine__load_kallsyms(struct machine *machine, const char *filename,
+ enum map_type type, symbol_filter_t filter)
+{
+ struct map *map = machine->vmlinux_maps[type];
+ int ret = dso__load_kallsyms(map->dso, filename, map, filter);
+
+ if (ret > 0) {
+ dso__set_loaded(map->dso, type);
+ /*
+ * Since /proc/kallsyms will have multiple sessions for the
+ * kernel, with modules between them, fixup the end of all
+ * sections.
+ */
+ __map_groups__fixup_end(&machine->kmaps, type);
+ }
+
+ return ret;
+}
+
+int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
+ symbol_filter_t filter)
+{
+ struct map *map = machine->vmlinux_maps[type];
+ int ret = dso__load_vmlinux_path(map->dso, map, filter);
+
+ if (ret > 0) {
+ dso__set_loaded(map->dso, type);
+ map__reloc_vmlinux(map);
+ }
+
+ return ret;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-10 08:20:42 +0000