v4.19.13 snapshot.
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
new file mode 100644
index 0000000..d188b75
--- /dev/null
+++ b/tools/perf/util/symbol.c
@@ -0,0 +1,2248 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <dirent.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <linux/kernel.h>
+#include <linux/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include "annotate.h"
+#include "build-id.h"
+#include "util.h"
+#include "debug.h"
+#include "machine.h"
+#include "symbol.h"
+#include "strlist.h"
+#include "intlist.h"
+#include "namespaces.h"
+#include "header.h"
+#include "path.h"
+#include "sane_ctype.h"
+
+#include <elf.h>
+#include <limits.h>
+#include <symbol/kallsyms.h>
+#include <sys/utsname.h>
+
+static int dso__load_kernel_sym(struct dso *dso, struct map *map);
+static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
+static bool symbol__is_idle(const char *name);
+
+int vmlinux_path__nr_entries;
+char **vmlinux_path;
+
+struct symbol_conf symbol_conf = {
+ .use_modules = true,
+ .try_vmlinux_path = true,
+ .demangle = true,
+ .demangle_kernel = false,
+ .cumulate_callchain = true,
+ .show_hist_headers = true,
+ .symfs = "",
+ .event_group = true,
+ .inline_name = true,
+};
+
+static enum dso_binary_type binary_type_symtab[] = {
+ DSO_BINARY_TYPE__KALLSYMS,
+ DSO_BINARY_TYPE__GUEST_KALLSYMS,
+ DSO_BINARY_TYPE__JAVA_JIT,
+ DSO_BINARY_TYPE__DEBUGLINK,
+ DSO_BINARY_TYPE__BUILD_ID_CACHE,
+ DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
+ DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
+ DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
+ DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
+ DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
+ DSO_BINARY_TYPE__GUEST_KMODULE,
+ DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
+ DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
+ DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
+ DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
+ DSO_BINARY_TYPE__NOT_FOUND,
+};
+
+#define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
+
+static bool symbol_type__filter(char symbol_type)
+{
+ symbol_type = toupper(symbol_type);
+ return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B';
+}
+
+static int prefix_underscores_count(const char *str)
+{
+ const char *tail = str;
+
+ while (*tail == '_')
+ tail++;
+
+ return tail - str;
+}
+
+const char * __weak arch__normalize_symbol_name(const char *name)
+{
+ return name;
+}
+
+int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
+{
+ return strcmp(namea, nameb);
+}
+
+int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
+ unsigned int n)
+{
+ return strncmp(namea, nameb, n);
+}
+
+int __weak arch__choose_best_symbol(struct symbol *syma,
+ struct symbol *symb __maybe_unused)
+{
+ /* Avoid "SyS" kernel syscall aliases */
+ if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
+ return SYMBOL_B;
+ if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
+ return SYMBOL_B;
+
+ return SYMBOL_A;
+}
+
+static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
+{
+ s64 a;
+ s64 b;
+ size_t na, nb;
+
+ /* Prefer a symbol with non zero length */
+ a = syma->end - syma->start;
+ b = symb->end - symb->start;
+ if ((b == 0) && (a > 0))
+ return SYMBOL_A;
+ else if ((a == 0) && (b > 0))
+ return SYMBOL_B;
+
+ /* Prefer a non weak symbol over a weak one */
+ a = syma->binding == STB_WEAK;
+ b = symb->binding == STB_WEAK;
+ if (b && !a)
+ return SYMBOL_A;
+ if (a && !b)
+ return SYMBOL_B;
+
+ /* Prefer a global symbol over a non global one */
+ a = syma->binding == STB_GLOBAL;
+ b = symb->binding == STB_GLOBAL;
+ if (a && !b)
+ return SYMBOL_A;
+ if (b && !a)
+ return SYMBOL_B;
+
+ /* Prefer a symbol with less underscores */
+ a = prefix_underscores_count(syma->name);
+ b = prefix_underscores_count(symb->name);
+ if (b > a)
+ return SYMBOL_A;
+ else if (a > b)
+ return SYMBOL_B;
+
+ /* Choose the symbol with the longest name */
+ na = strlen(syma->name);
+ nb = strlen(symb->name);
+ if (na > nb)
+ return SYMBOL_A;
+ else if (na < nb)
+ return SYMBOL_B;
+
+ return arch__choose_best_symbol(syma, symb);
+}
+
+void symbols__fixup_duplicate(struct rb_root *symbols)
+{
+ struct rb_node *nd;
+ struct symbol *curr, *next;
+
+ if (symbol_conf.allow_aliases)
+ return;
+
+ nd = rb_first(symbols);
+
+ while (nd) {
+ curr = rb_entry(nd, struct symbol, rb_node);
+again:
+ nd = rb_next(&curr->rb_node);
+ next = rb_entry(nd, struct symbol, rb_node);
+
+ if (!nd)
+ break;
+
+ if (curr->start != next->start)
+ continue;
+
+ if (choose_best_symbol(curr, next) == SYMBOL_A) {
+ rb_erase(&next->rb_node, symbols);
+ symbol__delete(next);
+ goto again;
+ } else {
+ nd = rb_next(&curr->rb_node);
+ rb_erase(&curr->rb_node, symbols);
+ symbol__delete(curr);
+ }
+ }
+}
+
+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;
+ }
+
+ /* Last entry */
+ if (curr->end == curr->start)
+ curr->end = roundup(curr->start, 4096) + 4096;
+}
+
+void map_groups__fixup_end(struct map_groups *mg)
+{
+ struct maps *maps = &mg->maps;
+ struct map *next, *curr;
+
+ down_write(&maps->lock);
+
+ curr = maps__first(maps);
+ if (curr == NULL)
+ goto out_unlock;
+
+ for (next = map__next(curr); next; next = map__next(curr)) {
+ if (!curr->end)
+ curr->end = next->start;
+ curr = next;
+ }
+
+ /*
+ * We still haven't the actual symbols, so guess the
+ * last map final address.
+ */
+ if (!curr->end)
+ curr->end = ~0ULL;
+
+out_unlock:
+ up_write(&maps->lock);
+}
+
+struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, 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) {
+ if (symbol_conf.init_annotation) {
+ struct annotation *notes = (void *)sym;
+ pthread_mutex_init(¬es->lock, NULL);
+ }
+ sym = ((void *)sym) + symbol_conf.priv_size;
+ }
+
+ sym->start = start;
+ sym->end = len ? start + len : start;
+ sym->type = type;
+ 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);
+}
+
+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 __symbols__insert(struct rb_root *symbols, struct symbol *sym, bool kernel)
+{
+ struct rb_node **p = &symbols->rb_node;
+ struct rb_node *parent = NULL;
+ const u64 ip = sym->start;
+ struct symbol *s;
+
+ if (kernel) {
+ const char *name = sym->name;
+ /*
+ * ppc64 uses function descriptors and appends a '.' to the
+ * start of every instruction address. Remove it.
+ */
+ if (name[0] == '.')
+ name++;
+ sym->idle = symbol__is_idle(name);
+ }
+
+ 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);
+}
+
+void symbols__insert(struct rb_root *symbols, struct symbol *sym)
+{
+ __symbols__insert(symbols, sym, false);
+}
+
+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 || (ip == s->end && ip != s->start))
+ n = n->rb_right;
+ else
+ return s;
+ }
+
+ return NULL;
+}
+
+static struct symbol *symbols__first(struct rb_root *symbols)
+{
+ struct rb_node *n = rb_first(symbols);
+
+ if (n)
+ return rb_entry(n, struct symbol, rb_node);
+
+ return NULL;
+}
+
+static struct symbol *symbols__last(struct rb_root *symbols)
+{
+ struct rb_node *n = rb_last(symbols);
+
+ if (n)
+ return rb_entry(n, struct symbol, rb_node);
+
+ return NULL;
+}
+
+static struct symbol *symbols__next(struct symbol *sym)
+{
+ struct rb_node *n = rb_next(&sym->rb_node);
+
+ if (n)
+ return rb_entry(n, struct symbol, rb_node);
+
+ return NULL;
+}
+
+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);
+ }
+}
+
+int symbol__match_symbol_name(const char *name, const char *str,
+ enum symbol_tag_include includes)
+{
+ const char *versioning;
+
+ if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
+ (versioning = strstr(name, "@@"))) {
+ int len = strlen(str);
+
+ if (len < versioning - name)
+ len = versioning - name;
+
+ return arch__compare_symbol_names_n(name, str, len);
+ } else
+ return arch__compare_symbol_names(name, str);
+}
+
+static struct symbol *symbols__find_by_name(struct rb_root *symbols,
+ const char *name,
+ enum symbol_tag_include includes)
+{
+ struct rb_node *n;
+ struct symbol_name_rb_node *s = NULL;
+
+ if (symbols == NULL)
+ return NULL;
+
+ n = symbols->rb_node;
+
+ while (n) {
+ int cmp;
+
+ s = rb_entry(n, struct symbol_name_rb_node, rb_node);
+ cmp = symbol__match_symbol_name(s->sym.name, name, includes);
+
+ if (cmp > 0)
+ n = n->rb_left;
+ else if (cmp < 0)
+ n = n->rb_right;
+ else
+ break;
+ }
+
+ if (n == NULL)
+ return NULL;
+
+ if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
+ /* return first symbol that has same name (if any) */
+ for (n = rb_prev(n); n; n = rb_prev(n)) {
+ struct symbol_name_rb_node *tmp;
+
+ tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
+ if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
+ break;
+
+ s = tmp;
+ }
+
+ return &s->sym;
+}
+
+void dso__reset_find_symbol_cache(struct dso *dso)
+{
+ dso->last_find_result.addr = 0;
+ dso->last_find_result.symbol = NULL;
+}
+
+void dso__insert_symbol(struct dso *dso, struct symbol *sym)
+{
+ __symbols__insert(&dso->symbols, sym, dso->kernel);
+
+ /* update the symbol cache if necessary */
+ if (dso->last_find_result.addr >= sym->start &&
+ (dso->last_find_result.addr < sym->end ||
+ sym->start == sym->end)) {
+ dso->last_find_result.symbol = sym;
+ }
+}
+
+struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
+{
+ if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
+ dso->last_find_result.addr = addr;
+ dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
+ }
+
+ return dso->last_find_result.symbol;
+}
+
+struct symbol *dso__first_symbol(struct dso *dso)
+{
+ return symbols__first(&dso->symbols);
+}
+
+struct symbol *dso__last_symbol(struct dso *dso)
+{
+ return symbols__last(&dso->symbols);
+}
+
+struct symbol *dso__next_symbol(struct symbol *sym)
+{
+ return symbols__next(sym);
+}
+
+struct symbol *symbol__next_by_name(struct symbol *sym)
+{
+ struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
+ struct rb_node *n = rb_next(&s->rb_node);
+
+ return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
+}
+
+ /*
+ * Returns first symbol that matched with @name.
+ */
+struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
+{
+ struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
+ SYMBOL_TAG_INCLUDE__NONE);
+ if (!s)
+ s = symbols__find_by_name(&dso->symbol_names, name,
+ SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
+ return s;
+}
+
+void dso__sort_by_name(struct dso *dso)
+{
+ dso__set_sorted_by_name(dso);
+ return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
+}
+
+int modules__parse(const char *filename, void *arg,
+ int (*process_module)(void *arg, const char *name,
+ u64 start, u64 size))
+{
+ char *line = NULL;
+ size_t n;
+ FILE *file;
+ int err = 0;
+
+ file = fopen(filename, "r");
+ if (file == NULL)
+ return -1;
+
+ while (1) {
+ char name[PATH_MAX];
+ u64 start, size;
+ char *sep, *endptr;
+ ssize_t line_len;
+
+ line_len = getline(&line, &n, file);
+ if (line_len < 0) {
+ if (feof(file))
+ break;
+ err = -1;
+ goto out;
+ }
+
+ if (!line) {
+ err = -1;
+ goto out;
+ }
+
+ 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';
+
+ scnprintf(name, sizeof(name), "[%s]", line);
+
+ size = strtoul(sep + 1, &endptr, 0);
+ if (*endptr != ' ' && *endptr != '\t')
+ continue;
+
+ err = process_module(arg, name, start, size);
+ if (err)
+ break;
+ }
+out:
+ free(line);
+ fclose(file);
+ return err;
+}
+
+/*
+ * These are symbols in the kernel image, so make sure that
+ * sym is from a kernel DSO.
+ */
+static bool symbol__is_idle(const char *name)
+{
+ const char * const idle_symbols[] = {
+ "cpu_idle",
+ "cpu_startup_entry",
+ "intel_idle",
+ "default_idle",
+ "native_safe_halt",
+ "enter_idle",
+ "exit_idle",
+ "mwait_idle",
+ "mwait_idle_with_hints",
+ "poll_idle",
+ "ppc64_runlatch_off",
+ "pseries_dedicated_idle_sleep",
+ NULL
+ };
+ int i;
+
+ for (i = 0; idle_symbols[i]; i++) {
+ if (!strcmp(idle_symbols[i], name))
+ return true;
+ }
+
+ return false;
+}
+
+static int map__process_kallsym_symbol(void *arg, const char *name,
+ char type, u64 start)
+{
+ struct symbol *sym;
+ struct dso *dso = arg;
+ struct rb_root *root = &dso->symbols;
+
+ if (!symbol_type__filter(type))
+ return 0;
+
+ /*
+ * module symbols are not sorted so we add all
+ * symbols, setting length to 0, and rely on
+ * symbols__fixup_end() to fix it up.
+ */
+ sym = symbol__new(start, 0, kallsyms2elf_binding(type), 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, !strchr(name, '['));
+
+ 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)
+{
+ return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
+}
+
+static int map_groups__split_kallsyms_for_kcore(struct map_groups *kmaps, struct dso *dso)
+{
+ struct map *curr_map;
+ struct symbol *pos;
+ int count = 0;
+ struct rb_root old_root = dso->symbols;
+ struct rb_root *root = &dso->symbols;
+ struct rb_node *next = rb_first(root);
+
+ if (!kmaps)
+ return -1;
+
+ *root = RB_ROOT;
+
+ while (next) {
+ char *module;
+
+ pos = rb_entry(next, struct symbol, rb_node);
+ next = rb_next(&pos->rb_node);
+
+ rb_erase_init(&pos->rb_node, &old_root);
+
+ module = strchr(pos->name, '\t');
+ if (module)
+ *module = '\0';
+
+ curr_map = map_groups__find(kmaps, pos->start);
+
+ if (!curr_map) {
+ symbol__delete(pos);
+ continue;
+ }
+
+ pos->start -= curr_map->start - curr_map->pgoff;
+ if (pos->end)
+ pos->end -= curr_map->start - curr_map->pgoff;
+ symbols__insert(&curr_map->dso->symbols, pos);
+ ++count;
+ }
+
+ /* Symbols have been adjusted */
+ dso->adjust_symbols = 1;
+
+ return count;
+}
+
+/*
+ * 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 map_groups__split_kallsyms(struct map_groups *kmaps, struct dso *dso, u64 delta,
+ struct map *initial_map)
+{
+ struct machine *machine;
+ struct map *curr_map = initial_map;
+ struct symbol *pos;
+ int count = 0, moved = 0;
+ struct rb_root *root = &dso->symbols;
+ struct rb_node *next = rb_first(root);
+ int kernel_range = 0;
+ bool x86_64;
+
+ if (!kmaps)
+ return -1;
+
+ machine = kmaps->machine;
+
+ x86_64 = machine__is(machine, "x86_64");
+
+ 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 != initial_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 = map_groups__find_by_name(kmaps, module);
+ if (curr_map == NULL) {
+ pr_debug("%s/proc/{kallsyms,modules} "
+ "inconsistency while looking "
+ "for \"%s\" module!\n",
+ machine->root_dir, module);
+ curr_map = initial_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 initial_map->start.
+ */
+ pos->start = curr_map->map_ip(curr_map, pos->start);
+ pos->end = curr_map->map_ip(curr_map, pos->end);
+ } else if (x86_64 && is_entry_trampoline(pos->name)) {
+ /*
+ * These symbols are not needed anymore since the
+ * trampoline maps refer to the text section and it's
+ * symbols instead. Avoid having to deal with
+ * relocations, and the assumption that the first symbol
+ * is the start of kernel text, by simply removing the
+ * symbols at this point.
+ */
+ goto discard_symbol;
+ } else if (curr_map != initial_map) {
+ char dso_name[PATH_MAX];
+ struct dso *ndso;
+
+ if (delta) {
+ /* Kernel was relocated at boot time */
+ pos->start -= delta;
+ pos->end -= delta;
+ }
+
+ if (count == 0) {
+ curr_map = initial_map;
+ goto add_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);
+ if (curr_map == NULL) {
+ dso__put(ndso);
+ return -1;
+ }
+
+ curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
+ map_groups__insert(kmaps, curr_map);
+ ++kernel_range;
+ } else if (delta) {
+ /* Kernel was relocated at boot time */
+ pos->start -= delta;
+ pos->end -= delta;
+ }
+add_symbol:
+ if (curr_map != initial_map) {
+ rb_erase(&pos->rb_node, root);
+ symbols__insert(&curr_map->dso->symbols, pos);
+ ++moved;
+ } else
+ ++count;
+
+ continue;
+discard_symbol:
+ rb_erase(&pos->rb_node, root);
+ symbol__delete(pos);
+ }
+
+ if (curr_map != initial_map &&
+ dso->kernel == DSO_TYPE_GUEST_KERNEL &&
+ machine__is_default_guest(kmaps->machine)) {
+ dso__set_loaded(curr_map->dso);
+ }
+
+ return count + moved;
+}
+
+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;
+}
+
+struct module_info {
+ struct rb_node rb_node;
+ char *name;
+ u64 start;
+};
+
+static void add_module(struct module_info *mi, struct rb_root *modules)
+{
+ struct rb_node **p = &modules->rb_node;
+ struct rb_node *parent = NULL;
+ struct module_info *m;
+
+ while (*p != NULL) {
+ parent = *p;
+ m = rb_entry(parent, struct module_info, rb_node);
+ if (strcmp(mi->name, m->name) < 0)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+ }
+ rb_link_node(&mi->rb_node, parent, p);
+ rb_insert_color(&mi->rb_node, modules);
+}
+
+static void delete_modules(struct rb_root *modules)
+{
+ struct module_info *mi;
+ struct rb_node *next = rb_first(modules);
+
+ while (next) {
+ mi = rb_entry(next, struct module_info, rb_node);
+ next = rb_next(&mi->rb_node);
+ rb_erase(&mi->rb_node, modules);
+ zfree(&mi->name);
+ free(mi);
+ }
+}
+
+static struct module_info *find_module(const char *name,
+ struct rb_root *modules)
+{
+ struct rb_node *n = modules->rb_node;
+
+ while (n) {
+ struct module_info *m;
+ int cmp;
+
+ m = rb_entry(n, struct module_info, rb_node);
+ cmp = strcmp(name, m->name);
+ if (cmp < 0)
+ n = n->rb_left;
+ else if (cmp > 0)
+ n = n->rb_right;
+ else
+ return m;
+ }
+
+ return NULL;
+}
+
+static int __read_proc_modules(void *arg, const char *name, u64 start,
+ u64 size __maybe_unused)
+{
+ struct rb_root *modules = arg;
+ struct module_info *mi;
+
+ mi = zalloc(sizeof(struct module_info));
+ if (!mi)
+ return -ENOMEM;
+
+ mi->name = strdup(name);
+ mi->start = start;
+
+ if (!mi->name) {
+ free(mi);
+ return -ENOMEM;
+ }
+
+ add_module(mi, modules);
+
+ return 0;
+}
+
+static int read_proc_modules(const char *filename, struct rb_root *modules)
+{
+ if (symbol__restricted_filename(filename, "/proc/modules"))
+ return -1;
+
+ if (modules__parse(filename, modules, __read_proc_modules)) {
+ delete_modules(modules);
+ return -1;
+ }
+
+ return 0;
+}
+
+int compare_proc_modules(const char *from, const char *to)
+{
+ struct rb_root from_modules = RB_ROOT;
+ struct rb_root to_modules = RB_ROOT;
+ struct rb_node *from_node, *to_node;
+ struct module_info *from_m, *to_m;
+ int ret = -1;
+
+ if (read_proc_modules(from, &from_modules))
+ return -1;
+
+ if (read_proc_modules(to, &to_modules))
+ goto out_delete_from;
+
+ from_node = rb_first(&from_modules);
+ to_node = rb_first(&to_modules);
+ while (from_node) {
+ if (!to_node)
+ break;
+
+ from_m = rb_entry(from_node, struct module_info, rb_node);
+ to_m = rb_entry(to_node, struct module_info, rb_node);
+
+ if (from_m->start != to_m->start ||
+ strcmp(from_m->name, to_m->name))
+ break;
+
+ from_node = rb_next(from_node);
+ to_node = rb_next(to_node);
+ }
+
+ if (!from_node && !to_node)
+ ret = 0;
+
+ delete_modules(&to_modules);
+out_delete_from:
+ delete_modules(&from_modules);
+
+ return ret;
+}
+
+struct map *map_groups__first(struct map_groups *mg)
+{
+ return maps__first(&mg->maps);
+}
+
+static int do_validate_kcore_modules(const char *filename,
+ struct map_groups *kmaps)
+{
+ struct rb_root modules = RB_ROOT;
+ struct map *old_map;
+ int err;
+
+ err = read_proc_modules(filename, &modules);
+ if (err)
+ return err;
+
+ old_map = map_groups__first(kmaps);
+ while (old_map) {
+ struct map *next = map_groups__next(old_map);
+ struct module_info *mi;
+
+ if (!__map__is_kmodule(old_map)) {
+ old_map = next;
+ continue;
+ }
+
+ /* Module must be in memory at the same address */
+ mi = find_module(old_map->dso->short_name, &modules);
+ if (!mi || mi->start != old_map->start) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ old_map = next;
+ }
+out:
+ delete_modules(&modules);
+ return err;
+}
+
+/*
+ * If kallsyms is referenced by name then we look for filename in the same
+ * directory.
+ */
+static bool filename_from_kallsyms_filename(char *filename,
+ const char *base_name,
+ const char *kallsyms_filename)
+{
+ char *name;
+
+ strcpy(filename, kallsyms_filename);
+ name = strrchr(filename, '/');
+ if (!name)
+ return false;
+
+ name += 1;
+
+ if (!strcmp(name, "kallsyms")) {
+ strcpy(name, base_name);
+ return true;
+ }
+
+ return false;
+}
+
+static int validate_kcore_modules(const char *kallsyms_filename,
+ struct map *map)
+{
+ struct map_groups *kmaps = map__kmaps(map);
+ char modules_filename[PATH_MAX];
+
+ if (!kmaps)
+ return -EINVAL;
+
+ if (!filename_from_kallsyms_filename(modules_filename, "modules",
+ kallsyms_filename))
+ return -EINVAL;
+
+ if (do_validate_kcore_modules(modules_filename, kmaps))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int validate_kcore_addresses(const char *kallsyms_filename,
+ struct map *map)
+{
+ struct kmap *kmap = map__kmap(map);
+
+ if (!kmap)
+ return -EINVAL;
+
+ if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
+ u64 start;
+
+ if (kallsyms__get_function_start(kallsyms_filename,
+ kmap->ref_reloc_sym->name, &start))
+ return -ENOENT;
+ if (start != kmap->ref_reloc_sym->addr)
+ return -EINVAL;
+ }
+
+ return validate_kcore_modules(kallsyms_filename, map);
+}
+
+struct kcore_mapfn_data {
+ struct dso *dso;
+ struct list_head maps;
+};
+
+static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
+{
+ struct kcore_mapfn_data *md = data;
+ struct map *map;
+
+ map = map__new2(start, md->dso);
+ if (map == NULL)
+ return -ENOMEM;
+
+ map->end = map->start + len;
+ map->pgoff = pgoff;
+
+ list_add(&map->node, &md->maps);
+
+ return 0;
+}
+
+static int dso__load_kcore(struct dso *dso, struct map *map,
+ const char *kallsyms_filename)
+{
+ struct map_groups *kmaps = map__kmaps(map);
+ struct kcore_mapfn_data md;
+ struct map *old_map, *new_map, *replacement_map = NULL;
+ struct machine *machine;
+ bool is_64_bit;
+ int err, fd;
+ char kcore_filename[PATH_MAX];
+ u64 stext;
+
+ if (!kmaps)
+ return -EINVAL;
+
+ machine = kmaps->machine;
+
+ /* This function requires that the map is the kernel map */
+ if (!__map__is_kernel(map))
+ return -EINVAL;
+
+ if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
+ kallsyms_filename))
+ return -EINVAL;
+
+ /* Modules and kernel must be present at their original addresses */
+ if (validate_kcore_addresses(kallsyms_filename, map))
+ return -EINVAL;
+
+ md.dso = dso;
+ INIT_LIST_HEAD(&md.maps);
+
+ fd = open(kcore_filename, O_RDONLY);
+ if (fd < 0) {
+ pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
+ kcore_filename);
+ return -EINVAL;
+ }
+
+ /* Read new maps into temporary lists */
+ err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
+ &is_64_bit);
+ if (err)
+ goto out_err;
+ dso->is_64_bit = is_64_bit;
+
+ if (list_empty(&md.maps)) {
+ err = -EINVAL;
+ goto out_err;
+ }
+
+ /* Remove old maps */
+ old_map = map_groups__first(kmaps);
+ while (old_map) {
+ struct map *next = map_groups__next(old_map);
+
+ if (old_map != map)
+ map_groups__remove(kmaps, old_map);
+ old_map = next;
+ }
+ machine->trampolines_mapped = false;
+
+ /* Find the kernel map using the '_stext' symbol */
+ if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
+ list_for_each_entry(new_map, &md.maps, node) {
+ if (stext >= new_map->start && stext < new_map->end) {
+ replacement_map = new_map;
+ break;
+ }
+ }
+ }
+
+ if (!replacement_map)
+ replacement_map = list_entry(md.maps.next, struct map, node);
+
+ /* Add new maps */
+ while (!list_empty(&md.maps)) {
+ new_map = list_entry(md.maps.next, struct map, node);
+ list_del_init(&new_map->node);
+ if (new_map == replacement_map) {
+ map->start = new_map->start;
+ map->end = new_map->end;
+ map->pgoff = new_map->pgoff;
+ map->map_ip = new_map->map_ip;
+ map->unmap_ip = new_map->unmap_ip;
+ /* Ensure maps are correctly ordered */
+ map__get(map);
+ map_groups__remove(kmaps, map);
+ map_groups__insert(kmaps, map);
+ map__put(map);
+ } else {
+ map_groups__insert(kmaps, new_map);
+ }
+
+ map__put(new_map);
+ }
+
+ if (machine__is(machine, "x86_64")) {
+ u64 addr;
+
+ /*
+ * If one of the corresponding symbols is there, assume the
+ * entry trampoline maps are too.
+ */
+ if (!kallsyms__get_function_start(kallsyms_filename,
+ ENTRY_TRAMPOLINE_NAME,
+ &addr))
+ machine->trampolines_mapped = true;
+ }
+
+ /*
+ * Set the data type and long name so that kcore can be read via
+ * dso__data_read_addr().
+ */
+ if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+ dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
+ else
+ dso->binary_type = DSO_BINARY_TYPE__KCORE;
+ dso__set_long_name(dso, strdup(kcore_filename), true);
+
+ close(fd);
+
+ if (map->prot & PROT_EXEC)
+ pr_debug("Using %s for kernel object code\n", kcore_filename);
+ else
+ pr_debug("Using %s for kernel data\n", kcore_filename);
+
+ return 0;
+
+out_err:
+ while (!list_empty(&md.maps)) {
+ map = list_entry(md.maps.next, struct map, node);
+ list_del_init(&map->node);
+ map__put(map);
+ }
+ close(fd);
+ return -EINVAL;
+}
+
+/*
+ * If the kernel is relocated at boot time, kallsyms won't match. Compute the
+ * delta based on the relocation reference symbol.
+ */
+static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
+{
+ u64 addr;
+
+ if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
+ return 0;
+
+ if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
+ return -1;
+
+ *delta = addr - kmap->ref_reloc_sym->addr;
+ return 0;
+}
+
+int __dso__load_kallsyms(struct dso *dso, const char *filename,
+ struct map *map, bool no_kcore)
+{
+ struct kmap *kmap = map__kmap(map);
+ u64 delta = 0;
+
+ if (symbol__restricted_filename(filename, "/proc/kallsyms"))
+ return -1;
+
+ if (!kmap || !kmap->kmaps)
+ return -1;
+
+ if (dso__load_all_kallsyms(dso, filename) < 0)
+ return -1;
+
+ if (kallsyms__delta(kmap, filename, &delta))
+ return -1;
+
+ symbols__fixup_end(&dso->symbols);
+ symbols__fixup_duplicate(&dso->symbols);
+
+ if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+ dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
+ else
+ dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
+
+ if (!no_kcore && !dso__load_kcore(dso, map, filename))
+ return map_groups__split_kallsyms_for_kcore(kmap->kmaps, dso);
+ else
+ return map_groups__split_kallsyms(kmap->kmaps, dso, delta, map);
+}
+
+int dso__load_kallsyms(struct dso *dso, const char *filename,
+ struct map *map)
+{
+ return __dso__load_kallsyms(dso, filename, map, false);
+}
+
+static int dso__load_perf_map(const char *map_path, struct dso *dso)
+{
+ char *line = NULL;
+ size_t n;
+ FILE *file;
+ int nr_syms = 0;
+
+ file = fopen(map_path, "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, STT_FUNC, line + len);
+
+ if (sym == NULL)
+ goto out_delete_line;
+
+ symbols__insert(&dso->symbols, sym);
+ nr_syms++;
+ }
+
+ free(line);
+ fclose(file);
+
+ return nr_syms;
+
+out_delete_line:
+ free(line);
+out_failure:
+ return -1;
+}
+
+static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
+ enum dso_binary_type type)
+{
+ switch (type) {
+ case DSO_BINARY_TYPE__JAVA_JIT:
+ case DSO_BINARY_TYPE__DEBUGLINK:
+ case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
+ case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
+ case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
+ case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
+ case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
+ return !kmod && dso->kernel == DSO_TYPE_USER;
+
+ case DSO_BINARY_TYPE__KALLSYMS:
+ case DSO_BINARY_TYPE__VMLINUX:
+ case DSO_BINARY_TYPE__KCORE:
+ return dso->kernel == DSO_TYPE_KERNEL;
+
+ case DSO_BINARY_TYPE__GUEST_KALLSYMS:
+ case DSO_BINARY_TYPE__GUEST_VMLINUX:
+ case DSO_BINARY_TYPE__GUEST_KCORE:
+ return dso->kernel == DSO_TYPE_GUEST_KERNEL;
+
+ case DSO_BINARY_TYPE__GUEST_KMODULE:
+ case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
+ case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
+ case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
+ /*
+ * kernel modules know their symtab type - it's set when
+ * creating a module dso in machine__findnew_module_map().
+ */
+ return kmod && dso->symtab_type == type;
+
+ case DSO_BINARY_TYPE__BUILD_ID_CACHE:
+ case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
+ return true;
+
+ case DSO_BINARY_TYPE__NOT_FOUND:
+ default:
+ return false;
+ }
+}
+
+/* Checks for the existence of the perf-<pid>.map file in two different
+ * locations. First, if the process is a separate mount namespace, check in
+ * that namespace using the pid of the innermost pid namespace. If's not in a
+ * namespace, or the file can't be found there, try in the mount namespace of
+ * the tracing process using our view of its pid.
+ */
+static int dso__find_perf_map(char *filebuf, size_t bufsz,
+ struct nsinfo **nsip)
+{
+ struct nscookie nsc;
+ struct nsinfo *nsi;
+ struct nsinfo *nnsi;
+ int rc = -1;
+
+ nsi = *nsip;
+
+ if (nsi->need_setns) {
+ snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
+ nsinfo__mountns_enter(nsi, &nsc);
+ rc = access(filebuf, R_OK);
+ nsinfo__mountns_exit(&nsc);
+ if (rc == 0)
+ return rc;
+ }
+
+ nnsi = nsinfo__copy(nsi);
+ if (nnsi) {
+ nsinfo__put(nsi);
+
+ nnsi->need_setns = false;
+ snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
+ *nsip = nnsi;
+ rc = 0;
+ }
+
+ return rc;
+}
+
+int dso__load(struct dso *dso, struct map *map)
+{
+ char *name;
+ int ret = -1;
+ u_int i;
+ struct machine *machine;
+ char *root_dir = (char *) "";
+ int ss_pos = 0;
+ struct symsrc ss_[2];
+ struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
+ bool kmod;
+ bool perfmap;
+ unsigned char build_id[BUILD_ID_SIZE];
+ struct nscookie nsc;
+ char newmapname[PATH_MAX];
+ const char *map_path = dso->long_name;
+
+ perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
+ if (perfmap) {
+ if (dso->nsinfo && (dso__find_perf_map(newmapname,
+ sizeof(newmapname), &dso->nsinfo) == 0)) {
+ map_path = newmapname;
+ }
+ }
+
+ nsinfo__mountns_enter(dso->nsinfo, &nsc);
+ pthread_mutex_lock(&dso->lock);
+
+ /* check again under the dso->lock */
+ if (dso__loaded(dso)) {
+ ret = 1;
+ goto out;
+ }
+
+ if (map->groups && map->groups->machine)
+ machine = map->groups->machine;
+ else
+ machine = NULL;
+
+ if (dso->kernel) {
+ if (dso->kernel == DSO_TYPE_KERNEL)
+ ret = dso__load_kernel_sym(dso, map);
+ else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+ ret = dso__load_guest_kernel_sym(dso, map);
+
+ if (machine__is(machine, "x86_64"))
+ machine__map_x86_64_entry_trampolines(machine, dso);
+ goto out;
+ }
+
+ dso->adjust_symbols = 0;
+
+ if (perfmap) {
+ struct stat st;
+
+ if (lstat(map_path, &st) < 0)
+ goto out;
+
+ if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) {
+ pr_warning("File %s not owned by current user or root, "
+ "ignoring it (use -f to override).\n", map_path);
+ goto out;
+ }
+
+ ret = dso__load_perf_map(map_path, dso);
+ dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
+ DSO_BINARY_TYPE__NOT_FOUND;
+ goto out;
+ }
+
+ if (machine)
+ root_dir = machine->root_dir;
+
+ name = malloc(PATH_MAX);
+ if (!name)
+ goto out;
+
+ kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
+ dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
+ dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
+ dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
+
+
+ /*
+ * Read the build id if possible. This is required for
+ * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
+ */
+ if (!dso->has_build_id &&
+ is_regular_file(dso->long_name)) {
+ __symbol__join_symfs(name, PATH_MAX, dso->long_name);
+ if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
+ dso__set_build_id(dso, build_id);
+ }
+
+ /*
+ * Iterate over candidate debug images.
+ * Keep track of "interesting" ones (those which have a symtab, dynsym,
+ * and/or opd section) for processing.
+ */
+ for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
+ struct symsrc *ss = &ss_[ss_pos];
+ bool next_slot = false;
+ bool is_reg;
+ bool nsexit;
+ int sirc = -1;
+
+ enum dso_binary_type symtab_type = binary_type_symtab[i];
+
+ nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
+ symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
+
+ if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
+ continue;
+
+ if (dso__read_binary_type_filename(dso, symtab_type,
+ root_dir, name, PATH_MAX))
+ continue;
+
+ if (nsexit)
+ nsinfo__mountns_exit(&nsc);
+
+ is_reg = is_regular_file(name);
+ if (is_reg)
+ sirc = symsrc__init(ss, dso, name, symtab_type);
+
+ if (nsexit)
+ nsinfo__mountns_enter(dso->nsinfo, &nsc);
+
+ if (!is_reg || sirc < 0)
+ continue;
+
+ if (!syms_ss && symsrc__has_symtab(ss)) {
+ syms_ss = ss;
+ next_slot = true;
+ if (!dso->symsrc_filename)
+ dso->symsrc_filename = strdup(name);
+ }
+
+ if (!runtime_ss && symsrc__possibly_runtime(ss)) {
+ runtime_ss = ss;
+ next_slot = true;
+ }
+
+ if (next_slot) {
+ ss_pos++;
+
+ if (syms_ss && runtime_ss)
+ break;
+ } else {
+ symsrc__destroy(ss);
+ }
+
+ }
+
+ if (!runtime_ss && !syms_ss)
+ goto out_free;
+
+ if (runtime_ss && !syms_ss) {
+ syms_ss = runtime_ss;
+ }
+
+ /* We'll have to hope for the best */
+ if (!runtime_ss && syms_ss)
+ runtime_ss = syms_ss;
+
+ if (syms_ss)
+ ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
+ else
+ ret = -1;
+
+ if (ret > 0) {
+ int nr_plt;
+
+ nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
+ if (nr_plt > 0)
+ ret += nr_plt;
+ }
+
+ for (; ss_pos > 0; ss_pos--)
+ symsrc__destroy(&ss_[ss_pos - 1]);
+out_free:
+ free(name);
+ if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
+ ret = 0;
+out:
+ dso__set_loaded(dso);
+ pthread_mutex_unlock(&dso->lock);
+ nsinfo__mountns_exit(&nsc);
+
+ return ret;
+}
+
+struct map *map_groups__find_by_name(struct map_groups *mg, const char *name)
+{
+ struct maps *maps = &mg->maps;
+ struct map *map;
+
+ down_read(&maps->lock);
+
+ for (map = maps__first(maps); map; map = map__next(map)) {
+ if (map->dso && strcmp(map->dso->short_name, name) == 0)
+ goto out_unlock;
+ }
+
+ map = NULL;
+
+out_unlock:
+ up_read(&maps->lock);
+ return map;
+}
+
+int dso__load_vmlinux(struct dso *dso, struct map *map,
+ const char *vmlinux, bool vmlinux_allocated)
+{
+ int err = -1;
+ struct symsrc ss;
+ char symfs_vmlinux[PATH_MAX];
+ enum dso_binary_type symtab_type;
+
+ if (vmlinux[0] == '/')
+ snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
+ else
+ symbol__join_symfs(symfs_vmlinux, vmlinux);
+
+ if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+ symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
+ else
+ symtab_type = DSO_BINARY_TYPE__VMLINUX;
+
+ if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
+ return -1;
+
+ err = dso__load_sym(dso, map, &ss, &ss, 0);
+ symsrc__destroy(&ss);
+
+ if (err > 0) {
+ if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
+ dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
+ else
+ dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
+ dso__set_long_name(dso, vmlinux, vmlinux_allocated);
+ dso__set_loaded(dso);
+ pr_debug("Using %s for symbols\n", symfs_vmlinux);
+ }
+
+ return err;
+}
+
+int dso__load_vmlinux_path(struct dso *dso, struct map *map)
+{
+ int i, err = 0;
+ char *filename = NULL;
+
+ pr_debug("Looking at the vmlinux_path (%d entries long)\n",
+ vmlinux_path__nr_entries + 1);
+
+ for (i = 0; i < vmlinux_path__nr_entries; ++i) {
+ err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
+ if (err > 0)
+ goto out;
+ }
+
+ if (!symbol_conf.ignore_vmlinux_buildid)
+ filename = dso__build_id_filename(dso, NULL, 0, false);
+ if (filename != NULL) {
+ err = dso__load_vmlinux(dso, map, filename, true);
+ if (err > 0)
+ goto out;
+ free(filename);
+ }
+out:
+ return err;
+}
+
+static bool visible_dir_filter(const char *name, struct dirent *d)
+{
+ if (d->d_type != DT_DIR)
+ return false;
+ return lsdir_no_dot_filter(name, d);
+}
+
+static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
+{
+ char kallsyms_filename[PATH_MAX];
+ int ret = -1;
+ struct strlist *dirs;
+ struct str_node *nd;
+
+ dirs = lsdir(dir, visible_dir_filter);
+ if (!dirs)
+ return -1;
+
+ strlist__for_each_entry(nd, dirs) {
+ scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
+ "%s/%s/kallsyms", dir, nd->s);
+ if (!validate_kcore_addresses(kallsyms_filename, map)) {
+ strlcpy(dir, kallsyms_filename, dir_sz);
+ ret = 0;
+ break;
+ }
+ }
+
+ strlist__delete(dirs);
+
+ return ret;
+}
+
+/*
+ * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
+ * since access(R_OK) only checks with real UID/GID but open() use effective
+ * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
+ */
+static bool filename__readable(const char *file)
+{
+ int fd = open(file, O_RDONLY);
+ if (fd < 0)
+ return false;
+ close(fd);
+ return true;
+}
+
+static char *dso__find_kallsyms(struct dso *dso, struct map *map)
+{
+ u8 host_build_id[BUILD_ID_SIZE];
+ char sbuild_id[SBUILD_ID_SIZE];
+ bool is_host = false;
+ char path[PATH_MAX];
+
+ if (!dso->has_build_id) {
+ /*
+ * Last resort, if we don't have a build-id and couldn't find
+ * any vmlinux file, try the running kernel kallsyms table.
+ */
+ goto proc_kallsyms;
+ }
+
+ if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
+ sizeof(host_build_id)) == 0)
+ is_host = dso__build_id_equal(dso, host_build_id);
+
+ /* Try a fast path for /proc/kallsyms if possible */
+ if (is_host) {
+ /*
+ * Do not check the build-id cache, unless we know we cannot use
+ * /proc/kcore or module maps don't match to /proc/kallsyms.
+ * To check readability of /proc/kcore, do not use access(R_OK)
+ * since /proc/kcore requires CAP_SYS_RAWIO to read and access
+ * can't check it.
+ */
+ if (filename__readable("/proc/kcore") &&
+ !validate_kcore_addresses("/proc/kallsyms", map))
+ goto proc_kallsyms;
+ }
+
+ build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
+
+ /* Find kallsyms in build-id cache with kcore */
+ scnprintf(path, sizeof(path), "%s/%s/%s",
+ buildid_dir, DSO__NAME_KCORE, sbuild_id);
+
+ if (!find_matching_kcore(map, path, sizeof(path)))
+ return strdup(path);
+
+ /* Use current /proc/kallsyms if possible */
+ if (is_host) {
+proc_kallsyms:
+ return strdup("/proc/kallsyms");
+ }
+
+ /* Finally, find a cache of kallsyms */
+ if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
+ pr_err("No kallsyms or vmlinux with build-id %s was found\n",
+ sbuild_id);
+ return NULL;
+ }
+
+ return strdup(path);
+}
+
+static int dso__load_kernel_sym(struct dso *dso, struct map *map)
+{
+ 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.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
+ return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
+ }
+
+ if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
+ err = dso__load_vmlinux_path(dso, map);
+ if (err > 0)
+ return err;
+ }
+
+ /* do not try local files if a symfs was given */
+ if (symbol_conf.symfs[0] != 0)
+ return -1;
+
+ kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
+ if (!kallsyms_allocated_filename)
+ return -1;
+
+ kallsyms_filename = kallsyms_allocated_filename;
+
+do_kallsyms:
+ err = dso__load_kallsyms(dso, kallsyms_filename, map);
+ if (err > 0)
+ pr_debug("Using %s for symbols\n", kallsyms_filename);
+ free(kallsyms_allocated_filename);
+
+ if (err > 0 && !dso__is_kcore(dso)) {
+ dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
+ dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
+ map__fixup_start(map);
+ map__fixup_end(map);
+ }
+
+ return err;
+}
+
+static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
+{
+ 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,
+ false);
+ return err;
+ }
+
+ 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);
+ if (err > 0)
+ pr_debug("Using %s for symbols\n", kallsyms_filename);
+ if (err > 0 && !dso__is_kcore(dso)) {
+ dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
+ dso__set_long_name(dso, machine->mmap_name, false);
+ map__fixup_start(map);
+ map__fixup_end(map);
+ }
+
+ return err;
+}
+
+static void vmlinux_path__exit(void)
+{
+ while (--vmlinux_path__nr_entries >= 0)
+ zfree(&vmlinux_path[vmlinux_path__nr_entries]);
+ vmlinux_path__nr_entries = 0;
+
+ zfree(&vmlinux_path);
+}
+
+static const char * const vmlinux_paths[] = {
+ "vmlinux",
+ "/boot/vmlinux"
+};
+
+static const char * const vmlinux_paths_upd[] = {
+ "/boot/vmlinux-%s",
+ "/usr/lib/debug/boot/vmlinux-%s",
+ "/lib/modules/%s/build/vmlinux",
+ "/usr/lib/debug/lib/modules/%s/vmlinux",
+ "/usr/lib/debug/boot/vmlinux-%s.debug"
+};
+
+static int vmlinux_path__add(const char *new_entry)
+{
+ vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
+ if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
+ return -1;
+ ++vmlinux_path__nr_entries;
+
+ return 0;
+}
+
+static int vmlinux_path__init(struct perf_env *env)
+{
+ struct utsname uts;
+ char bf[PATH_MAX];
+ char *kernel_version;
+ unsigned int i;
+
+ vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
+ ARRAY_SIZE(vmlinux_paths_upd)));
+ if (vmlinux_path == NULL)
+ return -1;
+
+ for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
+ if (vmlinux_path__add(vmlinux_paths[i]) < 0)
+ goto out_fail;
+
+ /* only try kernel version if no symfs was given */
+ if (symbol_conf.symfs[0] != 0)
+ return 0;
+
+ if (env) {
+ kernel_version = env->os_release;
+ } else {
+ if (uname(&uts) < 0)
+ goto out_fail;
+
+ kernel_version = uts.release;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
+ snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
+ if (vmlinux_path__add(bf) < 0)
+ goto out_fail;
+ }
+
+ return 0;
+
+out_fail:
+ vmlinux_path__exit();
+ return -1;
+}
+
+int setup_list(struct strlist **list, const char *list_str,
+ const char *list_name)
+{
+ if (list_str == NULL)
+ return 0;
+
+ *list = strlist__new(list_str, NULL);
+ if (!*list) {
+ pr_err("problems parsing %s list\n", list_name);
+ return -1;
+ }
+
+ symbol_conf.has_filter = true;
+ return 0;
+}
+
+int setup_intlist(struct intlist **list, const char *list_str,
+ const char *list_name)
+{
+ if (list_str == NULL)
+ return 0;
+
+ *list = intlist__new(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;
+ FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
+
+ if (fp != NULL) {
+ char line[8];
+
+ if (fgets(line, sizeof(line), fp) != NULL)
+ value = ((geteuid() != 0) || (getuid() != 0)) ?
+ (atoi(line) != 0) :
+ (atoi(line) == 2);
+
+ fclose(fp);
+ }
+
+ return value;
+}
+
+int symbol__annotation_init(void)
+{
+ if (symbol_conf.init_annotation)
+ return 0;
+
+ if (symbol_conf.initialized) {
+ pr_err("Annotation needs to be init before symbol__init()\n");
+ return -1;
+ }
+
+ symbol_conf.priv_size += sizeof(struct annotation);
+ symbol_conf.init_annotation = true;
+ return 0;
+}
+
+int symbol__init(struct perf_env *env)
+{
+ const char *symfs;
+
+ if (symbol_conf.initialized)
+ return 0;
+
+ symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
+
+ symbol__elf_init();
+
+ 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(env) < 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_intlist(&symbol_conf.pid_list,
+ symbol_conf.pid_list_str, "pid") < 0)
+ goto out_free_comm_list;
+
+ if (setup_intlist(&symbol_conf.tid_list,
+ symbol_conf.tid_list_str, "tid") < 0)
+ goto out_free_pid_list;
+
+ if (setup_list(&symbol_conf.sym_list,
+ symbol_conf.sym_list_str, "symbol") < 0)
+ goto out_free_tid_list;
+
+ if (setup_list(&symbol_conf.bt_stop_list,
+ symbol_conf.bt_stop_list_str, "symbol") < 0)
+ goto out_free_sym_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_sym_list:
+ strlist__delete(symbol_conf.sym_list);
+out_free_tid_list:
+ intlist__delete(symbol_conf.tid_list);
+out_free_pid_list:
+ intlist__delete(symbol_conf.pid_list);
+out_free_comm_list:
+ strlist__delete(symbol_conf.comm_list);
+out_free_dso_list:
+ strlist__delete(symbol_conf.dso_list);
+ return -1;
+}
+
+void symbol__exit(void)
+{
+ if (!symbol_conf.initialized)
+ return;
+ strlist__delete(symbol_conf.bt_stop_list);
+ strlist__delete(symbol_conf.sym_list);
+ strlist__delete(symbol_conf.dso_list);
+ strlist__delete(symbol_conf.comm_list);
+ intlist__delete(symbol_conf.tid_list);
+ intlist__delete(symbol_conf.pid_list);
+ vmlinux_path__exit();
+ symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
+ symbol_conf.bt_stop_list = NULL;
+ symbol_conf.initialized = false;
+}
+
+int symbol__config_symfs(const struct option *opt __maybe_unused,
+ const char *dir, int unset __maybe_unused)
+{
+ char *bf = NULL;
+ int ret;
+
+ symbol_conf.symfs = strdup(dir);
+ if (symbol_conf.symfs == NULL)
+ return -ENOMEM;
+
+ /* skip the locally configured cache if a symfs is given, and
+ * config buildid dir to symfs/.debug
+ */
+ ret = asprintf(&bf, "%s/%s", dir, ".debug");
+ if (ret < 0)
+ return -ENOMEM;
+
+ set_buildid_dir(bf);
+
+ free(bf);
+ return 0;
+}
+
+struct mem_info *mem_info__get(struct mem_info *mi)
+{
+ if (mi)
+ refcount_inc(&mi->refcnt);
+ return mi;
+}
+
+void mem_info__put(struct mem_info *mi)
+{
+ if (mi && refcount_dec_and_test(&mi->refcnt))
+ free(mi);
+}
+
+struct mem_info *mem_info__new(void)
+{
+ struct mem_info *mi = zalloc(sizeof(*mi));
+
+ if (mi)
+ refcount_set(&mi->refcnt, 1);
+ return mi;
+}