![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
And the DSO__ORIG_ enum to SYMTAB__, to clarify that this is about from where the symtab was obtained. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2603 lines
59 KiB
C
2603 lines
59 KiB
C
#define _GNU_SOURCE
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <libgen.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include "build-id.h"
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#include "debug.h"
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#include "symbol.h"
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#include "strlist.h"
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#include <libelf.h>
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#include <gelf.h>
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#include <elf.h>
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#include <limits.h>
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#include <sys/utsname.h>
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#ifndef KSYM_NAME_LEN
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#define KSYM_NAME_LEN 128
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#endif
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#ifndef NT_GNU_BUILD_ID
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#define NT_GNU_BUILD_ID 3
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#endif
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static bool dso__build_id_equal(const struct dso *self, u8 *build_id);
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static int elf_read_build_id(Elf *elf, void *bf, size_t size);
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static void dsos__add(struct list_head *head, struct dso *dso);
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static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
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static int dso__load_kernel_sym(struct dso *self, struct map *map,
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symbol_filter_t filter);
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static int dso__load_guest_kernel_sym(struct dso *self, struct map *map,
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symbol_filter_t filter);
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static int vmlinux_path__nr_entries;
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static char **vmlinux_path;
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struct symbol_conf symbol_conf = {
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.exclude_other = true,
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.use_modules = true,
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.try_vmlinux_path = true,
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.symfs = "",
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};
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int dso__name_len(const struct dso *self)
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{
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if (verbose)
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return self->long_name_len;
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return self->short_name_len;
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}
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bool dso__loaded(const struct dso *self, enum map_type type)
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{
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return self->loaded & (1 << type);
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}
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bool dso__sorted_by_name(const struct dso *self, enum map_type type)
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{
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return self->sorted_by_name & (1 << type);
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}
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static void dso__set_sorted_by_name(struct dso *self, enum map_type type)
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{
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self->sorted_by_name |= (1 << type);
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}
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bool symbol_type__is_a(char symbol_type, enum map_type map_type)
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{
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switch (map_type) {
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case MAP__FUNCTION:
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return symbol_type == 'T' || symbol_type == 'W';
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case MAP__VARIABLE:
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return symbol_type == 'D' || symbol_type == 'd';
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default:
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return false;
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}
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}
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static void symbols__fixup_end(struct rb_root *self)
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{
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struct rb_node *nd, *prevnd = rb_first(self);
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struct symbol *curr, *prev;
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if (prevnd == NULL)
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return;
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curr = rb_entry(prevnd, struct symbol, rb_node);
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for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
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prev = curr;
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curr = rb_entry(nd, struct symbol, rb_node);
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if (prev->end == prev->start && prev->end != curr->start)
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prev->end = curr->start - 1;
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}
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/* Last entry */
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if (curr->end == curr->start)
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curr->end = roundup(curr->start, 4096);
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}
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static void __map_groups__fixup_end(struct map_groups *self, enum map_type type)
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{
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struct map *prev, *curr;
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struct rb_node *nd, *prevnd = rb_first(&self->maps[type]);
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if (prevnd == NULL)
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return;
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curr = rb_entry(prevnd, struct map, rb_node);
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for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
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prev = curr;
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curr = rb_entry(nd, struct map, rb_node);
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prev->end = curr->start - 1;
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}
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/*
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* We still haven't the actual symbols, so guess the
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* last map final address.
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*/
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curr->end = ~0ULL;
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}
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static void map_groups__fixup_end(struct map_groups *self)
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{
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int i;
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for (i = 0; i < MAP__NR_TYPES; ++i)
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__map_groups__fixup_end(self, i);
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}
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static struct symbol *symbol__new(u64 start, u64 len, u8 binding,
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const char *name)
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{
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size_t namelen = strlen(name) + 1;
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struct symbol *self = calloc(1, (symbol_conf.priv_size +
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sizeof(*self) + namelen));
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if (self == NULL)
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return NULL;
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if (symbol_conf.priv_size)
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self = ((void *)self) + symbol_conf.priv_size;
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self->start = start;
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self->end = len ? start + len - 1 : start;
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self->binding = binding;
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self->namelen = namelen - 1;
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pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n", __func__, name, start, self->end);
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memcpy(self->name, name, namelen);
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return self;
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}
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void symbol__delete(struct symbol *self)
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{
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free(((void *)self) - symbol_conf.priv_size);
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}
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static size_t symbol__fprintf(struct symbol *self, FILE *fp)
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{
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return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
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self->start, self->end,
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self->binding == STB_GLOBAL ? 'g' :
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self->binding == STB_LOCAL ? 'l' : 'w',
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self->name);
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}
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void dso__set_long_name(struct dso *self, char *name)
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{
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if (name == NULL)
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return;
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self->long_name = name;
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self->long_name_len = strlen(name);
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}
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static void dso__set_short_name(struct dso *self, const char *name)
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{
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if (name == NULL)
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return;
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self->short_name = name;
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self->short_name_len = strlen(name);
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}
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static void dso__set_basename(struct dso *self)
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{
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dso__set_short_name(self, basename(self->long_name));
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}
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struct dso *dso__new(const char *name)
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{
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struct dso *self = calloc(1, sizeof(*self) + strlen(name) + 1);
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if (self != NULL) {
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int i;
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strcpy(self->name, name);
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dso__set_long_name(self, self->name);
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dso__set_short_name(self, self->name);
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for (i = 0; i < MAP__NR_TYPES; ++i)
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self->symbols[i] = self->symbol_names[i] = RB_ROOT;
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self->symtab_type = SYMTAB__NOT_FOUND;
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self->loaded = 0;
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self->sorted_by_name = 0;
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self->has_build_id = 0;
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self->kernel = DSO_TYPE_USER;
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INIT_LIST_HEAD(&self->node);
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}
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return self;
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}
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static void symbols__delete(struct rb_root *self)
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{
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struct symbol *pos;
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struct rb_node *next = rb_first(self);
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while (next) {
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pos = rb_entry(next, struct symbol, rb_node);
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next = rb_next(&pos->rb_node);
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rb_erase(&pos->rb_node, self);
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symbol__delete(pos);
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}
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}
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void dso__delete(struct dso *self)
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{
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int i;
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for (i = 0; i < MAP__NR_TYPES; ++i)
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symbols__delete(&self->symbols[i]);
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if (self->sname_alloc)
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free((char *)self->short_name);
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if (self->lname_alloc)
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free(self->long_name);
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free(self);
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}
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void dso__set_build_id(struct dso *self, void *build_id)
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{
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memcpy(self->build_id, build_id, sizeof(self->build_id));
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self->has_build_id = 1;
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}
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static void symbols__insert(struct rb_root *self, struct symbol *sym)
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{
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struct rb_node **p = &self->rb_node;
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struct rb_node *parent = NULL;
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const u64 ip = sym->start;
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struct symbol *s;
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while (*p != NULL) {
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parent = *p;
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s = rb_entry(parent, struct symbol, rb_node);
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if (ip < s->start)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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rb_link_node(&sym->rb_node, parent, p);
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rb_insert_color(&sym->rb_node, self);
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}
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static struct symbol *symbols__find(struct rb_root *self, u64 ip)
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{
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struct rb_node *n;
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if (self == NULL)
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return NULL;
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n = self->rb_node;
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while (n) {
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struct symbol *s = rb_entry(n, struct symbol, rb_node);
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if (ip < s->start)
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n = n->rb_left;
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else if (ip > s->end)
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n = n->rb_right;
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else
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return s;
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}
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return NULL;
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}
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struct symbol_name_rb_node {
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struct rb_node rb_node;
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struct symbol sym;
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};
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static void symbols__insert_by_name(struct rb_root *self, struct symbol *sym)
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{
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struct rb_node **p = &self->rb_node;
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struct rb_node *parent = NULL;
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struct symbol_name_rb_node *symn, *s;
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symn = container_of(sym, struct symbol_name_rb_node, sym);
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while (*p != NULL) {
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parent = *p;
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s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
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if (strcmp(sym->name, s->sym.name) < 0)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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rb_link_node(&symn->rb_node, parent, p);
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rb_insert_color(&symn->rb_node, self);
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}
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static void symbols__sort_by_name(struct rb_root *self, struct rb_root *source)
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{
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struct rb_node *nd;
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for (nd = rb_first(source); nd; nd = rb_next(nd)) {
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struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
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symbols__insert_by_name(self, pos);
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}
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}
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static struct symbol *symbols__find_by_name(struct rb_root *self, const char *name)
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{
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struct rb_node *n;
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if (self == NULL)
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return NULL;
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n = self->rb_node;
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while (n) {
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struct symbol_name_rb_node *s;
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int cmp;
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s = rb_entry(n, struct symbol_name_rb_node, rb_node);
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cmp = strcmp(name, s->sym.name);
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if (cmp < 0)
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n = n->rb_left;
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else if (cmp > 0)
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n = n->rb_right;
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else
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return &s->sym;
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}
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return NULL;
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}
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struct symbol *dso__find_symbol(struct dso *self,
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enum map_type type, u64 addr)
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{
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return symbols__find(&self->symbols[type], addr);
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}
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struct symbol *dso__find_symbol_by_name(struct dso *self, enum map_type type,
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const char *name)
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{
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return symbols__find_by_name(&self->symbol_names[type], name);
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}
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void dso__sort_by_name(struct dso *self, enum map_type type)
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{
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dso__set_sorted_by_name(self, type);
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return symbols__sort_by_name(&self->symbol_names[type],
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&self->symbols[type]);
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}
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int build_id__sprintf(const u8 *self, int len, char *bf)
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{
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char *bid = bf;
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const u8 *raw = self;
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int i;
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for (i = 0; i < len; ++i) {
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sprintf(bid, "%02x", *raw);
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++raw;
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bid += 2;
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}
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return raw - self;
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}
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size_t dso__fprintf_buildid(struct dso *self, FILE *fp)
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{
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char sbuild_id[BUILD_ID_SIZE * 2 + 1];
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build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
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return fprintf(fp, "%s", sbuild_id);
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}
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size_t dso__fprintf_symbols_by_name(struct dso *self, enum map_type type, FILE *fp)
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{
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size_t ret = 0;
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struct rb_node *nd;
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struct symbol_name_rb_node *pos;
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for (nd = rb_first(&self->symbol_names[type]); nd; nd = rb_next(nd)) {
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pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
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fprintf(fp, "%s\n", pos->sym.name);
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}
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return ret;
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}
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size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp)
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{
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struct rb_node *nd;
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size_t ret = fprintf(fp, "dso: %s (", self->short_name);
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if (self->short_name != self->long_name)
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ret += fprintf(fp, "%s, ", self->long_name);
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ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
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self->loaded ? "" : "NOT ");
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ret += dso__fprintf_buildid(self, fp);
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ret += fprintf(fp, ")\n");
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for (nd = rb_first(&self->symbols[type]); nd; nd = rb_next(nd)) {
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struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
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ret += symbol__fprintf(pos, fp);
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}
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return ret;
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}
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int kallsyms__parse(const char *filename, void *arg,
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int (*process_symbol)(void *arg, const char *name,
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char type, u64 start, u64 end))
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{
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char *line = NULL;
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size_t n;
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int err = -1;
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u64 prev_start = 0;
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char prev_symbol_type = 0;
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char *prev_symbol_name;
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FILE *file = fopen(filename, "r");
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if (file == NULL)
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goto out_failure;
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prev_symbol_name = malloc(KSYM_NAME_LEN);
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if (prev_symbol_name == NULL)
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goto out_close;
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err = 0;
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while (!feof(file)) {
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u64 start;
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int line_len, len;
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char symbol_type;
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char *symbol_name;
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line_len = getline(&line, &n, file);
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if (line_len < 0 || !line)
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break;
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line[--line_len] = '\0'; /* \n */
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len = hex2u64(line, &start);
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len++;
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if (len + 2 >= line_len)
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continue;
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symbol_type = toupper(line[len]);
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len += 2;
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symbol_name = line + len;
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len = line_len - len;
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if (len >= KSYM_NAME_LEN) {
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err = -1;
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break;
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}
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if (prev_symbol_type) {
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u64 end = start;
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if (end != prev_start)
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--end;
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err = process_symbol(arg, prev_symbol_name,
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prev_symbol_type, prev_start, end);
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if (err)
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break;
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}
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memcpy(prev_symbol_name, symbol_name, len + 1);
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prev_symbol_type = symbol_type;
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prev_start = start;
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}
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free(prev_symbol_name);
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free(line);
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out_close:
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fclose(file);
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return err;
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|
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out_failure:
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return -1;
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}
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|
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struct process_kallsyms_args {
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struct map *map;
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struct dso *dso;
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};
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static u8 kallsyms2elf_type(char type)
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{
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if (type == 'W')
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return STB_WEAK;
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return isupper(type) ? STB_GLOBAL : STB_LOCAL;
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}
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static int map__process_kallsym_symbol(void *arg, const char *name,
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char type, u64 start, u64 end)
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{
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struct symbol *sym;
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struct process_kallsyms_args *a = arg;
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struct rb_root *root = &a->dso->symbols[a->map->type];
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if (!symbol_type__is_a(type, a->map->type))
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return 0;
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sym = symbol__new(start, end - start + 1,
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kallsyms2elf_type(type), name);
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if (sym == NULL)
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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 *self, const char *filename,
|
|
struct map *map)
|
|
{
|
|
struct process_kallsyms_args args = { .map = map, .dso = self, };
|
|
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 *self, 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 = &self->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 &&
|
|
self->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 *dso;
|
|
|
|
if (count == 0) {
|
|
curr_map = map;
|
|
goto filter_symbol;
|
|
}
|
|
|
|
if (self->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++);
|
|
|
|
dso = dso__new(dso_name);
|
|
if (dso == NULL)
|
|
return -1;
|
|
|
|
dso->kernel = self->kernel;
|
|
|
|
curr_map = map__new2(pos->start, dso, map->type);
|
|
if (curr_map == NULL) {
|
|
dso__delete(dso);
|
|
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 &&
|
|
self->kernel == DSO_TYPE_GUEST_KERNEL &&
|
|
machine__is_default_guest(kmaps->machine)) {
|
|
dso__set_loaded(curr_map->dso, curr_map->type);
|
|
}
|
|
|
|
return count + moved;
|
|
}
|
|
|
|
int dso__load_kallsyms(struct dso *self, const char *filename,
|
|
struct map *map, symbol_filter_t filter)
|
|
{
|
|
if (dso__load_all_kallsyms(self, filename, map) < 0)
|
|
return -1;
|
|
|
|
if (self->kernel == DSO_TYPE_GUEST_KERNEL)
|
|
self->symtab_type = SYMTAB__GUEST_KALLSYMS;
|
|
else
|
|
self->symtab_type = SYMTAB__KALLSYMS;
|
|
|
|
return dso__split_kallsyms(self, map, filter);
|
|
}
|
|
|
|
static int dso__load_perf_map(struct dso *self, struct map *map,
|
|
symbol_filter_t filter)
|
|
{
|
|
char *line = NULL;
|
|
size_t n;
|
|
FILE *file;
|
|
int nr_syms = 0;
|
|
|
|
file = fopen(self->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(&self->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
|
|
*
|
|
* @self: 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 *self, 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, self->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(&self->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(&self->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__, self->long_name);
|
|
return 0;
|
|
}
|
|
|
|
static bool elf_sym__is_a(GElf_Sym *self, enum map_type type)
|
|
{
|
|
switch (type) {
|
|
case MAP__FUNCTION:
|
|
return elf_sym__is_function(self);
|
|
case MAP__VARIABLE:
|
|
return elf_sym__is_object(self);
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static bool elf_sec__is_a(GElf_Shdr *self, Elf_Data *secstrs, enum map_type type)
|
|
{
|
|
switch (type) {
|
|
case MAP__FUNCTION:
|
|
return elf_sec__is_text(self, secstrs);
|
|
case MAP__VARIABLE:
|
|
return elf_sec__is_data(self, 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 *self, struct map *map, const char *name,
|
|
int fd, symbol_filter_t filter, int kmodule,
|
|
int want_symtab)
|
|
{
|
|
struct kmap *kmap = self->kernel ? map__kmap(map) : NULL;
|
|
struct map *curr_map = map;
|
|
struct dso *curr_dso = self;
|
|
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 (self->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(self, 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 (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 (self->kernel == DSO_TYPE_USER) {
|
|
self->adjust_symbols = (ehdr.e_type == ET_EXEC ||
|
|
elf_section_by_name(elf, &ehdr, &shdr,
|
|
".gnu.prelink_undo",
|
|
NULL) != NULL);
|
|
} else self->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 (self->kernel != DSO_TYPE_USER || kmodule) {
|
|
char dso_name[PATH_MAX];
|
|
|
|
if (strcmp(section_name,
|
|
(curr_dso->short_name +
|
|
self->short_name_len)) == 0)
|
|
goto new_symbol;
|
|
|
|
if (strcmp(section_name, ".text") == 0) {
|
|
curr_map = map;
|
|
curr_dso = self;
|
|
goto new_symbol;
|
|
}
|
|
|
|
snprintf(dso_name, sizeof(dso_name),
|
|
"%s%s", self->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 = self->kernel;
|
|
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 = self->symtab_type;
|
|
map_groups__insert(kmap->kmaps, curr_map);
|
|
dsos__add(&self->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(&self->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 *self, u8 *build_id)
|
|
{
|
|
return memcmp(self->build_id, build_id, sizeof(self->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 *self)
|
|
{
|
|
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 (self == NULL || self->symtab_type == SYMTAB__NOT_FOUND)
|
|
return '!';
|
|
return origin[self->symtab_type];
|
|
}
|
|
|
|
int dso__load(struct dso *self, 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(self, map->type);
|
|
|
|
if (self->kernel == DSO_TYPE_KERNEL)
|
|
return dso__load_kernel_sym(self, map, filter);
|
|
else if (self->kernel == DSO_TYPE_GUEST_KERNEL)
|
|
return dso__load_guest_kernel_sym(self, map, filter);
|
|
|
|
if (map->groups && map->groups->machine)
|
|
machine = map->groups->machine;
|
|
else
|
|
machine = NULL;
|
|
|
|
name = malloc(size);
|
|
if (!name)
|
|
return -1;
|
|
|
|
self->adjust_symbols = 0;
|
|
|
|
if (strncmp(self->name, "/tmp/perf-", 10) == 0) {
|
|
ret = dso__load_perf_map(self, map, filter);
|
|
self->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
|
|
*/
|
|
for (self->symtab_type = SYMTAB__BUILD_ID_CACHE, want_symtab = 1;
|
|
self->symtab_type != SYMTAB__NOT_FOUND;
|
|
self->symtab_type++) {
|
|
switch (self->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(self, name, size) == NULL)) {
|
|
continue;
|
|
}
|
|
break;
|
|
case SYMTAB__FEDORA_DEBUGINFO:
|
|
snprintf(name, size, "%s/usr/lib/debug%s.debug",
|
|
symbol_conf.symfs, self->long_name);
|
|
break;
|
|
case SYMTAB__UBUNTU_DEBUGINFO:
|
|
snprintf(name, size, "%s/usr/lib/debug%s",
|
|
symbol_conf.symfs, self->long_name);
|
|
break;
|
|
case SYMTAB__BUILDID_DEBUGINFO: {
|
|
char build_id_hex[BUILD_ID_SIZE * 2 + 1];
|
|
|
|
if (!self->has_build_id)
|
|
continue;
|
|
|
|
build_id__sprintf(self->build_id,
|
|
sizeof(self->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, self->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, self->long_name);
|
|
break;
|
|
|
|
case SYMTAB__SYSTEM_PATH_KMODULE:
|
|
snprintf(name, size, "%s%s", symbol_conf.symfs,
|
|
self->long_name);
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* If we wanted a full symtab but no image had one,
|
|
* relax our requirements and repeat the search.
|
|
*/
|
|
if (want_symtab) {
|
|
want_symtab = 0;
|
|
self->symtab_type = SYMTAB__BUILD_ID_CACHE;
|
|
} else
|
|
continue;
|
|
}
|
|
|
|
/* Name is now the name of the next image to try */
|
|
fd = open(name, O_RDONLY);
|
|
if (fd < 0)
|
|
continue;
|
|
|
|
ret = dso__load_sym(self, 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(self, map, filter);
|
|
if (nr_plt > 0)
|
|
ret += nr_plt;
|
|
break;
|
|
}
|
|
}
|
|
|
|
free(name);
|
|
if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
|
|
return 0;
|
|
return ret;
|
|
}
|
|
|
|
struct map *map_groups__find_by_name(struct map_groups *self,
|
|
enum map_type type, const char *name)
|
|
{
|
|
struct rb_node *nd;
|
|
|
|
for (nd = rb_first(&self->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 *self,
|
|
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 = self->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, self->build_id,
|
|
sizeof(self->build_id)) == 0)
|
|
self->has_build_id = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int map_groups__set_modules_path_dir(struct map_groups *self,
|
|
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(self, 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(self, 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 *self)
|
|
{
|
|
char *version;
|
|
char modules_path[PATH_MAX];
|
|
|
|
version = get_kernel_version(self->root_dir);
|
|
if (!version)
|
|
return -1;
|
|
|
|
snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
|
|
self->root_dir, version);
|
|
free(version);
|
|
|
|
return map_groups__set_modules_path_dir(&self->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 *self = calloc(1, (sizeof(*self) +
|
|
(dso->kernel ? sizeof(struct kmap) : 0)));
|
|
if (self != NULL) {
|
|
/*
|
|
* ->end will be filled after we load all the symbols
|
|
*/
|
|
map__init(self, type, start, 0, 0, dso);
|
|
}
|
|
|
|
return self;
|
|
}
|
|
|
|
struct map *machine__new_module(struct machine *self, u64 start,
|
|
const char *filename)
|
|
{
|
|
struct map *map;
|
|
struct dso *dso = __dsos__findnew(&self->kernel_dsos, filename);
|
|
|
|
if (dso == NULL)
|
|
return NULL;
|
|
|
|
map = map__new2(start, dso, MAP__FUNCTION);
|
|
if (map == NULL)
|
|
return NULL;
|
|
|
|
if (machine__is_host(self))
|
|
dso->symtab_type = SYMTAB__SYSTEM_PATH_KMODULE;
|
|
else
|
|
dso->symtab_type = SYMTAB__GUEST_KMODULE;
|
|
map_groups__insert(&self->kmaps, map);
|
|
return map;
|
|
}
|
|
|
|
static int machine__create_modules(struct machine *self)
|
|
{
|
|
char *line = NULL;
|
|
size_t n;
|
|
FILE *file;
|
|
struct map *map;
|
|
const char *modules;
|
|
char path[PATH_MAX];
|
|
|
|
if (machine__is_default_guest(self))
|
|
modules = symbol_conf.default_guest_modules;
|
|
else {
|
|
sprintf(path, "%s/proc/modules", self->root_dir);
|
|
modules = path;
|
|
}
|
|
|
|
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(self, start, name);
|
|
if (map == NULL)
|
|
goto out_delete_line;
|
|
dso__kernel_module_get_build_id(map->dso, self->root_dir);
|
|
}
|
|
|
|
free(line);
|
|
fclose(file);
|
|
|
|
return machine__set_modules_path(self);
|
|
|
|
out_delete_line:
|
|
free(line);
|
|
out_failure:
|
|
return -1;
|
|
}
|
|
|
|
int dso__load_vmlinux(struct dso *self, 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_loaded(self, map->type);
|
|
err = dso__load_sym(self, 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 *self, 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(self, NULL, 0);
|
|
if (filename != NULL) {
|
|
err = dso__load_vmlinux(self, map, filename, filter);
|
|
if (err > 0) {
|
|
dso__set_long_name(self, filename);
|
|
goto out;
|
|
}
|
|
free(filename);
|
|
}
|
|
|
|
for (i = 0; i < vmlinux_path__nr_entries; ++i) {
|
|
err = dso__load_vmlinux(self, map, vmlinux_path[i], filter);
|
|
if (err > 0) {
|
|
dso__set_long_name(self, strdup(vmlinux_path[i]));
|
|
break;
|
|
}
|
|
}
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int dso__load_kernel_sym(struct dso *self, 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(self, map,
|
|
symbol_conf.vmlinux_name, filter);
|
|
if (err > 0) {
|
|
dso__set_long_name(self,
|
|
strdup(symbol_conf.vmlinux_name));
|
|
goto out_fixup;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
if (vmlinux_path != NULL) {
|
|
err = dso__load_vmlinux_path(self, 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 (self->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(self, 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(self->build_id, sizeof(self->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(self, 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(self, strdup("[kernel.kallsyms]"));
|
|
map__fixup_start(map);
|
|
map__fixup_end(map);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int dso__load_guest_kernel_sym(struct dso *self, 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(self, 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(self, 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(self, 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 *self, FILE *fp)
|
|
{
|
|
struct rb_node *nd;
|
|
size_t ret = 0;
|
|
|
|
for (nd = rb_first(self); 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 *self, FILE *fp, bool with_hits)
|
|
{
|
|
return __dsos__fprintf_buildid(&self->kernel_dsos, fp, with_hits) +
|
|
__dsos__fprintf_buildid(&self->user_dsos, fp, with_hits);
|
|
}
|
|
|
|
size_t machines__fprintf_dsos_buildid(struct rb_root *self, FILE *fp, bool with_hits)
|
|
{
|
|
struct rb_node *nd;
|
|
size_t ret = 0;
|
|
|
|
for (nd = rb_first(self); 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 *self = dso__new(name ?: "[kernel.kallsyms]");
|
|
|
|
if (self != NULL) {
|
|
dso__set_short_name(self, "[kernel]");
|
|
self->kernel = DSO_TYPE_KERNEL;
|
|
}
|
|
|
|
return self;
|
|
}
|
|
|
|
static struct dso *dso__new_guest_kernel(struct machine *machine,
|
|
const char *name)
|
|
{
|
|
char bf[PATH_MAX];
|
|
struct dso *self = dso__new(name ?: machine__mmap_name(machine, bf, sizeof(bf)));
|
|
|
|
if (self != NULL) {
|
|
dso__set_short_name(self, "[guest.kernel]");
|
|
self->kernel = DSO_TYPE_GUEST_KERNEL;
|
|
}
|
|
|
|
return self;
|
|
}
|
|
|
|
void dso__read_running_kernel_build_id(struct dso *self, 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, self->build_id,
|
|
sizeof(self->build_id)) == 0)
|
|
self->has_build_id = true;
|
|
}
|
|
|
|
static struct dso *machine__create_kernel(struct machine *self)
|
|
{
|
|
const char *vmlinux_name = NULL;
|
|
struct dso *kernel;
|
|
|
|
if (machine__is_host(self)) {
|
|
vmlinux_name = symbol_conf.vmlinux_name;
|
|
kernel = dso__new_kernel(vmlinux_name);
|
|
} else {
|
|
if (machine__is_default_guest(self))
|
|
vmlinux_name = symbol_conf.default_guest_vmlinux_name;
|
|
kernel = dso__new_guest_kernel(self, vmlinux_name);
|
|
}
|
|
|
|
if (kernel != NULL) {
|
|
dso__read_running_kernel_build_id(kernel, self);
|
|
dsos__add(&self->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 (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
|
|
return 0;
|
|
|
|
return args.start;
|
|
}
|
|
|
|
int __machine__create_kernel_maps(struct machine *self, struct dso *kernel)
|
|
{
|
|
enum map_type type;
|
|
u64 start = machine__get_kernel_start_addr(self);
|
|
|
|
for (type = 0; type < MAP__NR_TYPES; ++type) {
|
|
struct kmap *kmap;
|
|
|
|
self->vmlinux_maps[type] = map__new2(start, kernel, type);
|
|
if (self->vmlinux_maps[type] == NULL)
|
|
return -1;
|
|
|
|
self->vmlinux_maps[type]->map_ip =
|
|
self->vmlinux_maps[type]->unmap_ip = identity__map_ip;
|
|
|
|
kmap = map__kmap(self->vmlinux_maps[type]);
|
|
kmap->kmaps = &self->kmaps;
|
|
map_groups__insert(&self->kmaps, self->vmlinux_maps[type]);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void machine__destroy_kernel_maps(struct machine *self)
|
|
{
|
|
enum map_type type;
|
|
|
|
for (type = 0; type < MAP__NR_TYPES; ++type) {
|
|
struct kmap *kmap;
|
|
|
|
if (self->vmlinux_maps[type] == NULL)
|
|
continue;
|
|
|
|
kmap = map__kmap(self->vmlinux_maps[type]);
|
|
map_groups__remove(&self->kmaps, self->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(self->vmlinux_maps[type]);
|
|
self->vmlinux_maps[type] = NULL;
|
|
}
|
|
}
|
|
|
|
int machine__create_kernel_maps(struct machine *self)
|
|
{
|
|
struct dso *kernel = machine__create_kernel(self);
|
|
|
|
if (kernel == NULL ||
|
|
__machine__create_kernel_maps(self, kernel) < 0)
|
|
return -1;
|
|
|
|
if (symbol_conf.use_modules && machine__create_modules(self) < 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(&self->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 *self, FILE *fp)
|
|
{
|
|
int i;
|
|
size_t printed = 0;
|
|
struct dso *kdso = self->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;
|
|
}
|
|
|
|
int symbol__init(void)
|
|
{
|
|
const char *symfs;
|
|
|
|
if (symbol_conf.initialized)
|
|
return 0;
|
|
|
|
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.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 *self, pid_t pid)
|
|
{
|
|
struct machine *machine = machines__findnew(self, 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 *self)
|
|
{
|
|
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(self, 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(self, pid);
|
|
}
|
|
failure:
|
|
free(namelist);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void machines__destroy_guest_kernel_maps(struct rb_root *self)
|
|
{
|
|
struct rb_node *next = rb_first(self);
|
|
|
|
while (next) {
|
|
struct machine *pos = rb_entry(next, struct machine, rb_node);
|
|
|
|
next = rb_next(&pos->rb_node);
|
|
rb_erase(&pos->rb_node, self);
|
|
machine__delete(pos);
|
|
}
|
|
}
|
|
|
|
int machine__load_kallsyms(struct machine *self, const char *filename,
|
|
enum map_type type, symbol_filter_t filter)
|
|
{
|
|
struct map *map = self->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(&self->kmaps, type);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int machine__load_vmlinux_path(struct machine *self, enum map_type type,
|
|
symbol_filter_t filter)
|
|
{
|
|
struct map *map = self->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;
|
|
}
|