1465 lines
30 KiB
C
1465 lines
30 KiB
C
#include "util.h"
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#include "../perf.h"
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#include "string.h"
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#include "symbol.h"
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#include "thread.h"
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#include "debug.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 <sys/utsname.h>
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enum dso_origin {
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DSO__ORIG_KERNEL = 0,
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DSO__ORIG_JAVA_JIT,
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DSO__ORIG_FEDORA,
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DSO__ORIG_UBUNTU,
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DSO__ORIG_BUILDID,
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DSO__ORIG_DSO,
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DSO__ORIG_KMODULE,
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DSO__ORIG_NOT_FOUND,
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};
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static void dsos__add(struct dso *dso);
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static struct dso *dsos__find(const char *name);
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static struct map *map__new2(u64 start, struct dso *dso);
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static void kernel_maps__insert(struct map *map);
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unsigned int symbol__priv_size;
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static struct rb_root kernel_maps;
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static void dso__fixup_sym_end(struct dso *self)
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{
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struct rb_node *nd, *prevnd = rb_first(&self->syms);
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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)
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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 kernel_maps__fixup_end(void)
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{
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struct map *prev, *curr;
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struct rb_node *nd, *prevnd = rb_first(&kernel_maps);
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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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nd = rb_last(&curr->dso->syms);
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if (nd) {
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struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
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curr->end = sym->end;
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}
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}
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static struct symbol *symbol__new(u64 start, u64 len, 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__priv_size +
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sizeof(*self) + namelen));
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if (!self)
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return NULL;
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if (symbol__priv_size) {
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memset(self, 0, symbol__priv_size);
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self = ((void *)self) + symbol__priv_size;
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}
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self->start = start;
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self->end = len ? start + len - 1 : start;
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pr_debug3("%s: %s %#Lx-%#Lx\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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static void symbol__delete(struct symbol *self)
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{
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free(((void *)self) - symbol__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, " %llx-%llx %s\n",
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self->start, self->end, self->name);
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}
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static void dso__set_long_name(struct dso *self, char *name)
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{
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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_basename(struct dso *self)
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{
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self->short_name = 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 = malloc(sizeof(*self) + strlen(name) + 1);
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if (self != NULL) {
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strcpy(self->name, name);
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dso__set_long_name(self, self->name);
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self->short_name = self->name;
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self->syms = RB_ROOT;
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self->find_symbol = dso__find_symbol;
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self->slen_calculated = 0;
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self->origin = DSO__ORIG_NOT_FOUND;
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self->loaded = 0;
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self->has_build_id = 0;
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}
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return self;
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}
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static void dso__delete_symbols(struct dso *self)
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{
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struct symbol *pos;
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struct rb_node *next = rb_first(&self->syms);
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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->syms);
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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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dso__delete_symbols(self);
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if (self->long_name != self->name)
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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 dso__insert_symbol(struct dso *self, struct symbol *sym)
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{
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struct rb_node **p = &self->syms.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->syms);
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}
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struct symbol *dso__find_symbol(struct dso *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->syms.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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int build_id__sprintf(u8 *self, int len, char *bf)
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{
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char *bid = bf;
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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(struct dso *self, 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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ret += dso__fprintf_buildid(self, fp);
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ret += fprintf(fp, ")\n");
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for (nd = rb_first(&self->syms); 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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/*
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* Loads the function entries in /proc/kallsyms into kernel_map->dso,
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* so that we can in the next step set the symbol ->end address and then
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* call kernel_maps__split_kallsyms.
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*/
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static int kernel_maps__load_all_kallsyms(void)
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{
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char *line = NULL;
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size_t n;
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FILE *file = fopen("/proc/kallsyms", "r");
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if (file == NULL)
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goto out_failure;
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while (!feof(file)) {
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u64 start;
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struct symbol *sym;
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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)
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break;
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if (!line)
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goto out_failure;
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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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/*
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* We're interested only in code ('T'ext)
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*/
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if (symbol_type != 'T' && symbol_type != 'W')
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continue;
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symbol_name = line + len + 2;
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/*
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* Will fix up the end later, when we have all symbols sorted.
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*/
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sym = symbol__new(start, 0, symbol_name);
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if (sym == NULL)
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goto out_delete_line;
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/*
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* We will pass the symbols to the filter later, in
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* kernel_maps__split_kallsyms, when we have split the
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* maps per module
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*/
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dso__insert_symbol(kernel_map->dso, sym);
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}
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free(line);
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fclose(file);
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return 0;
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out_delete_line:
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free(line);
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out_failure:
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return -1;
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}
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/*
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* Split the symbols into maps, making sure there are no overlaps, i.e. the
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* kernel range is broken in several maps, named [kernel].N, as we don't have
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* the original ELF section names vmlinux have.
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*/
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static int kernel_maps__split_kallsyms(symbol_filter_t filter, int use_modules)
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{
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struct map *map = kernel_map;
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struct symbol *pos;
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int count = 0;
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struct rb_node *next = rb_first(&kernel_map->dso->syms);
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int kernel_range = 0;
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while (next) {
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char *module;
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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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module = strchr(pos->name, '\t');
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if (module) {
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if (!use_modules)
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goto delete_symbol;
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*module++ = '\0';
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if (strcmp(map->dso->name, module)) {
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map = kernel_maps__find_by_dso_name(module);
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if (!map) {
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pr_err("/proc/{kallsyms,modules} "
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"inconsistency!\n");
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return -1;
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}
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}
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/*
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* So that we look just like we get from .ko files,
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* i.e. not prelinked, relative to map->start.
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*/
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pos->start = map->map_ip(map, pos->start);
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pos->end = map->map_ip(map, pos->end);
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} else if (map != kernel_map) {
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char dso_name[PATH_MAX];
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struct dso *dso;
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snprintf(dso_name, sizeof(dso_name), "[kernel].%d",
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kernel_range++);
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dso = dso__new(dso_name);
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if (dso == NULL)
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return -1;
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map = map__new2(pos->start, dso);
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if (map == NULL) {
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dso__delete(dso);
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return -1;
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}
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map->map_ip = map->unmap_ip = identity__map_ip;
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kernel_maps__insert(map);
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++kernel_range;
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}
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if (filter && filter(map, pos)) {
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delete_symbol:
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rb_erase(&pos->rb_node, &kernel_map->dso->syms);
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symbol__delete(pos);
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} else {
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if (map != kernel_map) {
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rb_erase(&pos->rb_node, &kernel_map->dso->syms);
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dso__insert_symbol(map->dso, pos);
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}
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count++;
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}
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}
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return count;
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}
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static int kernel_maps__load_kallsyms(symbol_filter_t filter, int use_modules)
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{
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if (kernel_maps__load_all_kallsyms())
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return -1;
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dso__fixup_sym_end(kernel_map->dso);
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return kernel_maps__split_kallsyms(filter, use_modules);
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}
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static size_t kernel_maps__fprintf(FILE *fp)
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{
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size_t printed = fprintf(fp, "Kernel maps:\n");
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struct rb_node *nd;
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for (nd = rb_first(&kernel_maps); nd; nd = rb_next(nd)) {
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struct map *pos = rb_entry(nd, struct map, rb_node);
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printed += fprintf(fp, "Map:");
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printed += map__fprintf(pos, fp);
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if (verbose > 1) {
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printed += dso__fprintf(pos->dso, fp);
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printed += fprintf(fp, "--\n");
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}
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}
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return printed + fprintf(fp, "END kernel maps\n");
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}
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static int dso__load_perf_map(struct dso *self, struct map *map,
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symbol_filter_t filter)
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{
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char *line = NULL;
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size_t n;
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FILE *file;
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int nr_syms = 0;
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file = fopen(self->long_name, "r");
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if (file == NULL)
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goto out_failure;
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while (!feof(file)) {
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u64 start, size;
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struct symbol *sym;
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int line_len, len;
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line_len = getline(&line, &n, file);
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if (line_len < 0)
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break;
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if (!line)
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goto out_failure;
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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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len += hex2u64(line + len, &size);
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len++;
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if (len + 2 >= line_len)
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continue;
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sym = symbol__new(start, size, line + len);
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if (sym == NULL)
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goto out_delete_line;
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|
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if (filter && filter(map, sym))
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symbol__delete(sym);
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else {
|
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dso__insert_symbol(self, sym);
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nr_syms++;
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}
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}
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|
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free(line);
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fclose(file);
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return nr_syms;
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|
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out_delete_line:
|
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free(line);
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out_failure:
|
|
return -1;
|
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}
|
|
|
|
/**
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* elf_symtab__for_each_symbol - iterate thru all the symbols
|
|
*
|
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* @self: struct elf_symtab instance to iterate
|
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* @idx: uint32_t idx
|
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* @sym: GElf_Sym iterator
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|
*/
|
|
#define elf_symtab__for_each_symbol(syms, nr_syms, idx, sym) \
|
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for (idx = 0, gelf_getsym(syms, idx, &sym);\
|
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idx < nr_syms; \
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idx++, gelf_getsym(syms, idx, &sym))
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|
|
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static inline uint8_t elf_sym__type(const GElf_Sym *sym)
|
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{
|
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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 &&
|
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sym->st_name != 0 &&
|
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sym->st_shndx != SHN_UNDEF;
|
|
}
|
|
|
|
static inline int elf_sym__is_label(const GElf_Sym *sym)
|
|
{
|
|
return elf_sym__type(sym) == STT_NOTYPE &&
|
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sym->st_name != 0 &&
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sym->st_shndx != SHN_UNDEF &&
|
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sym->st_shndx != SHN_ABS;
|
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}
|
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|
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static inline const char *elf_sec__name(const GElf_Shdr *shdr,
|
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const Elf_Data *secstrs)
|
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{
|
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return secstrs->d_buf + shdr->sh_name;
|
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}
|
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|
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static inline int elf_sec__is_text(const GElf_Shdr *shdr,
|
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const Elf_Data *secstrs)
|
|
{
|
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return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
|
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}
|
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|
|
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;
|
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|
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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;
|
|
|
|
fd = open(self->long_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,
|
|
sympltname);
|
|
if (!f)
|
|
goto out_elf_end;
|
|
|
|
if (filter && filter(map, f))
|
|
symbol__delete(f);
|
|
else {
|
|
dso__insert_symbol(self, 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,
|
|
sympltname);
|
|
if (!f)
|
|
goto out_elf_end;
|
|
|
|
if (filter && filter(map, f))
|
|
symbol__delete(f);
|
|
else {
|
|
dso__insert_symbol(self, f);
|
|
++nr;
|
|
}
|
|
}
|
|
}
|
|
|
|
err = 0;
|
|
out_elf_end:
|
|
elf_end(elf);
|
|
out_close:
|
|
close(fd);
|
|
|
|
if (err == 0)
|
|
return nr;
|
|
out:
|
|
pr_warning("%s: problems reading %s PLT info.\n",
|
|
__func__, self->long_name);
|
|
return 0;
|
|
}
|
|
|
|
static int dso__load_sym(struct dso *self, struct map *map, const char *name,
|
|
int fd, symbol_filter_t filter, int kernel,
|
|
int kmodule)
|
|
{
|
|
struct map *curr_map = map;
|
|
struct dso *curr_dso = self;
|
|
size_t dso_name_len = strlen(self->short_name);
|
|
Elf_Data *symstrs, *secstrs;
|
|
uint32_t nr_syms;
|
|
int err = -1;
|
|
uint32_t idx;
|
|
GElf_Ehdr ehdr;
|
|
GElf_Shdr shdr;
|
|
Elf_Data *syms;
|
|
GElf_Sym sym;
|
|
Elf_Scn *sec, *sec_strndx;
|
|
Elf *elf;
|
|
int nr = 0;
|
|
|
|
elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
|
|
if (elf == NULL) {
|
|
pr_err("%s: cannot read %s ELF file.\n", __func__, name);
|
|
goto out_close;
|
|
}
|
|
|
|
if (gelf_getehdr(elf, &ehdr) == NULL) {
|
|
pr_err("%s: cannot get elf header.\n", __func__);
|
|
goto out_elf_end;
|
|
}
|
|
|
|
sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
|
|
if (sec == NULL) {
|
|
sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
|
|
if (sec == NULL)
|
|
goto out_elf_end;
|
|
}
|
|
|
|
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 (!kernel) {
|
|
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;
|
|
char *demangled = NULL;
|
|
int is_label = elf_sym__is_label(&sym);
|
|
const char *section_name;
|
|
|
|
if (!is_label && !elf_sym__is_function(&sym))
|
|
continue;
|
|
|
|
sec = elf_getscn(elf, sym.st_shndx);
|
|
if (!sec)
|
|
goto out_elf_end;
|
|
|
|
gelf_getshdr(sec, &shdr);
|
|
|
|
if (is_label && !elf_sec__is_text(&shdr, secstrs))
|
|
continue;
|
|
|
|
elf_name = elf_sym__name(&sym, symstrs);
|
|
section_name = elf_sec__name(&shdr, secstrs);
|
|
|
|
if (kernel || kmodule) {
|
|
char dso_name[PATH_MAX];
|
|
|
|
if (strcmp(section_name,
|
|
curr_dso->short_name + dso_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 = kernel_maps__find_by_dso_name(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_map = map__new2(start, curr_dso);
|
|
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->origin = DSO__ORIG_KERNEL;
|
|
kernel_maps__insert(curr_map);
|
|
dsos__add(curr_dso);
|
|
} else
|
|
curr_dso = curr_map->dso;
|
|
|
|
goto new_symbol;
|
|
}
|
|
|
|
if (curr_dso->adjust_symbols) {
|
|
pr_debug2("adjusting symbol: st_value: %Lx sh_addr: "
|
|
"%Lx sh_offset: %Lx\n", (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, elf_name);
|
|
free(demangled);
|
|
if (!f)
|
|
goto out_elf_end;
|
|
|
|
if (filter && filter(curr_map, f))
|
|
symbol__delete(f);
|
|
else {
|
|
dso__insert_symbol(curr_dso, f);
|
|
nr++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* For misannotated, zeroed, ASM function sizes.
|
|
*/
|
|
if (nr > 0)
|
|
dso__fixup_sym_end(self);
|
|
err = nr;
|
|
out_elf_end:
|
|
elf_end(elf);
|
|
out_close:
|
|
return err;
|
|
}
|
|
|
|
bool fetch_build_id_table(struct list_head *head)
|
|
{
|
|
bool have_buildid = false;
|
|
struct dso *pos;
|
|
|
|
list_for_each_entry(pos, &dsos, node) {
|
|
struct build_id_list *new;
|
|
struct build_id_event b;
|
|
size_t len;
|
|
|
|
if (filename__read_build_id(pos->long_name,
|
|
&b.build_id,
|
|
sizeof(b.build_id)) < 0)
|
|
continue;
|
|
have_buildid = true;
|
|
memset(&b.header, 0, sizeof(b.header));
|
|
len = pos->long_name_len + 1;
|
|
len = ALIGN(len, 64);
|
|
b.header.size = sizeof(b) + len;
|
|
|
|
new = malloc(sizeof(*new));
|
|
if (!new)
|
|
die("No memory\n");
|
|
|
|
memcpy(&new->event, &b, sizeof(b));
|
|
new->dso_name = pos->long_name;
|
|
new->len = len;
|
|
|
|
list_add_tail(&new->list, head);
|
|
}
|
|
|
|
return have_buildid;
|
|
}
|
|
|
|
int filename__read_build_id(const char *filename, void *bf, size_t size)
|
|
{
|
|
int fd, err = -1;
|
|
GElf_Ehdr ehdr;
|
|
GElf_Shdr shdr;
|
|
Elf_Data *build_id_data;
|
|
Elf_Scn *sec;
|
|
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;
|
|
}
|
|
|
|
if (gelf_getehdr(elf, &ehdr) == NULL) {
|
|
pr_err("%s: cannot get elf header.\n", __func__);
|
|
goto out_elf_end;
|
|
}
|
|
|
|
sec = elf_section_by_name(elf, &ehdr, &shdr,
|
|
".note.gnu.build-id", NULL);
|
|
if (sec == NULL)
|
|
goto out_elf_end;
|
|
|
|
build_id_data = elf_getdata(sec, NULL);
|
|
if (build_id_data == NULL)
|
|
goto out_elf_end;
|
|
memcpy(bf, build_id_data->d_buf + 16, BUILD_ID_SIZE);
|
|
err = BUILD_ID_SIZE;
|
|
out_elf_end:
|
|
elf_end(elf);
|
|
out_close:
|
|
close(fd);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
char dso__symtab_origin(const struct dso *self)
|
|
{
|
|
static const char origin[] = {
|
|
[DSO__ORIG_KERNEL] = 'k',
|
|
[DSO__ORIG_JAVA_JIT] = 'j',
|
|
[DSO__ORIG_FEDORA] = 'f',
|
|
[DSO__ORIG_UBUNTU] = 'u',
|
|
[DSO__ORIG_BUILDID] = 'b',
|
|
[DSO__ORIG_DSO] = 'd',
|
|
[DSO__ORIG_KMODULE] = 'K',
|
|
};
|
|
|
|
if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)
|
|
return '!';
|
|
return origin[self->origin];
|
|
}
|
|
|
|
int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
|
|
{
|
|
int size = PATH_MAX;
|
|
char *name = malloc(size);
|
|
u8 build_id[BUILD_ID_SIZE];
|
|
int ret = -1;
|
|
int fd;
|
|
|
|
self->loaded = 1;
|
|
|
|
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->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :
|
|
DSO__ORIG_NOT_FOUND;
|
|
return ret;
|
|
}
|
|
|
|
self->origin = DSO__ORIG_FEDORA - 1;
|
|
|
|
more:
|
|
do {
|
|
self->origin++;
|
|
switch (self->origin) {
|
|
case DSO__ORIG_FEDORA:
|
|
snprintf(name, size, "/usr/lib/debug%s.debug",
|
|
self->long_name);
|
|
break;
|
|
case DSO__ORIG_UBUNTU:
|
|
snprintf(name, size, "/usr/lib/debug%s",
|
|
self->long_name);
|
|
break;
|
|
case DSO__ORIG_BUILDID:
|
|
if (filename__read_build_id(self->long_name, build_id,
|
|
sizeof(build_id))) {
|
|
char build_id_hex[BUILD_ID_SIZE * 2 + 1];
|
|
|
|
build_id__sprintf(build_id, sizeof(build_id),
|
|
build_id_hex);
|
|
snprintf(name, size,
|
|
"/usr/lib/debug/.build-id/%.2s/%s.debug",
|
|
build_id_hex, build_id_hex + 2);
|
|
if (self->has_build_id)
|
|
goto compare_build_id;
|
|
break;
|
|
}
|
|
self->origin++;
|
|
/* Fall thru */
|
|
case DSO__ORIG_DSO:
|
|
snprintf(name, size, "%s", self->long_name);
|
|
break;
|
|
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
if (self->has_build_id) {
|
|
if (filename__read_build_id(name, build_id,
|
|
sizeof(build_id)) < 0)
|
|
goto more;
|
|
compare_build_id:
|
|
if (memcmp(build_id, self->build_id,
|
|
sizeof(self->build_id)) != 0)
|
|
goto more;
|
|
}
|
|
|
|
fd = open(name, O_RDONLY);
|
|
} while (fd < 0);
|
|
|
|
ret = dso__load_sym(self, map, name, fd, filter, 0, 0);
|
|
close(fd);
|
|
|
|
/*
|
|
* Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
|
|
*/
|
|
if (!ret)
|
|
goto more;
|
|
|
|
if (ret > 0) {
|
|
int nr_plt = dso__synthesize_plt_symbols(self, map, filter);
|
|
if (nr_plt > 0)
|
|
ret += nr_plt;
|
|
}
|
|
out:
|
|
free(name);
|
|
if (ret < 0 && strstr(self->name, " (deleted)") != NULL)
|
|
return 0;
|
|
return ret;
|
|
}
|
|
|
|
struct map *kernel_map;
|
|
|
|
static void kernel_maps__insert(struct map *map)
|
|
{
|
|
maps__insert(&kernel_maps, map);
|
|
}
|
|
|
|
struct symbol *kernel_maps__find_symbol(u64 ip, struct map **mapp)
|
|
{
|
|
struct map *map = maps__find(&kernel_maps, ip);
|
|
|
|
if (mapp)
|
|
*mapp = map;
|
|
|
|
if (map) {
|
|
ip = map->map_ip(map, ip);
|
|
return map->dso->find_symbol(map->dso, ip);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct map *kernel_maps__find_by_dso_name(const char *name)
|
|
{
|
|
struct rb_node *nd;
|
|
|
|
for (nd = rb_first(&kernel_maps); nd; nd = rb_next(nd)) {
|
|
struct map *map = rb_entry(nd, struct map, rb_node);
|
|
|
|
if (map->dso && strcmp(map->dso->name, name) == 0)
|
|
return map;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int dso__load_module_sym(struct dso *self, struct map *map,
|
|
symbol_filter_t filter)
|
|
{
|
|
int err = 0, fd = open(self->long_name, O_RDONLY);
|
|
|
|
self->loaded = 1;
|
|
|
|
if (fd < 0) {
|
|
pr_err("%s: cannot open %s\n", __func__, self->long_name);
|
|
return err;
|
|
}
|
|
|
|
err = dso__load_sym(self, map, self->long_name, fd, filter, 0, 1);
|
|
close(fd);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int dsos__load_modules_sym_dir(char *dirname, symbol_filter_t filter)
|
|
{
|
|
struct dirent *dent;
|
|
int nr_symbols = 0, err;
|
|
DIR *dir = opendir(dirname);
|
|
|
|
if (!dir) {
|
|
pr_err("%s: cannot open %s dir\n", __func__, dirname);
|
|
return -1;
|
|
}
|
|
|
|
while ((dent = readdir(dir)) != NULL) {
|
|
char path[PATH_MAX];
|
|
|
|
if (dent->d_type == DT_DIR) {
|
|
if (!strcmp(dent->d_name, ".") ||
|
|
!strcmp(dent->d_name, ".."))
|
|
continue;
|
|
|
|
snprintf(path, sizeof(path), "%s/%s",
|
|
dirname, dent->d_name);
|
|
err = dsos__load_modules_sym_dir(path, filter);
|
|
if (err < 0)
|
|
goto failure;
|
|
} else {
|
|
char *dot = strrchr(dent->d_name, '.'),
|
|
dso_name[PATH_MAX];
|
|
struct map *map;
|
|
struct rb_node *last;
|
|
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 = kernel_maps__find_by_dso_name(dso_name);
|
|
if (map == NULL)
|
|
continue;
|
|
|
|
snprintf(path, sizeof(path), "%s/%s",
|
|
dirname, dent->d_name);
|
|
|
|
long_name = strdup(path);
|
|
if (long_name == NULL)
|
|
goto failure;
|
|
dso__set_long_name(map->dso, long_name);
|
|
dso__set_basename(map->dso);
|
|
|
|
err = dso__load_module_sym(map->dso, map, filter);
|
|
if (err < 0)
|
|
goto failure;
|
|
last = rb_last(&map->dso->syms);
|
|
if (last) {
|
|
struct symbol *sym;
|
|
/*
|
|
* We do this here as well, even having the
|
|
* symbol size found in the symtab because
|
|
* misannotated ASM symbols may have the size
|
|
* set to zero.
|
|
*/
|
|
dso__fixup_sym_end(map->dso);
|
|
|
|
sym = rb_entry(last, struct symbol, rb_node);
|
|
map->end = map->start + sym->end;
|
|
}
|
|
}
|
|
nr_symbols += err;
|
|
}
|
|
|
|
return nr_symbols;
|
|
failure:
|
|
closedir(dir);
|
|
return -1;
|
|
}
|
|
|
|
static int dsos__load_modules_sym(symbol_filter_t filter)
|
|
{
|
|
struct utsname uts;
|
|
char modules_path[PATH_MAX];
|
|
|
|
if (uname(&uts) < 0)
|
|
return -1;
|
|
|
|
snprintf(modules_path, sizeof(modules_path), "/lib/modules/%s/kernel",
|
|
uts.release);
|
|
|
|
return dsos__load_modules_sym_dir(modules_path, filter);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct map *self = malloc(sizeof(*self));
|
|
|
|
if (self != NULL) {
|
|
/*
|
|
* ->end will be filled after we load all the symbols
|
|
*/
|
|
map__init(self, start, 0, 0, dso);
|
|
}
|
|
|
|
return self;
|
|
}
|
|
|
|
static int dsos__load_modules(void)
|
|
{
|
|
char *line = NULL;
|
|
size_t n;
|
|
FILE *file = fopen("/proc/modules", "r");
|
|
struct map *map;
|
|
|
|
if (file == NULL)
|
|
return -1;
|
|
|
|
while (!feof(file)) {
|
|
char name[PATH_MAX];
|
|
u64 start;
|
|
struct dso *dso;
|
|
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);
|
|
dso = dso__new(name);
|
|
|
|
if (dso == NULL)
|
|
goto out_delete_line;
|
|
|
|
map = map__new2(start, dso);
|
|
if (map == NULL) {
|
|
dso__delete(dso);
|
|
goto out_delete_line;
|
|
}
|
|
|
|
dso->origin = DSO__ORIG_KMODULE;
|
|
kernel_maps__insert(map);
|
|
dsos__add(dso);
|
|
}
|
|
|
|
free(line);
|
|
fclose(file);
|
|
|
|
return 0;
|
|
|
|
out_delete_line:
|
|
free(line);
|
|
out_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int dso__load_vmlinux(struct dso *self, struct map *map,
|
|
const char *vmlinux, symbol_filter_t filter)
|
|
{
|
|
int err, fd = open(vmlinux, O_RDONLY);
|
|
|
|
self->loaded = 1;
|
|
|
|
if (fd < 0)
|
|
return -1;
|
|
|
|
err = dso__load_sym(self, map, self->long_name, fd, filter, 1, 0);
|
|
|
|
close(fd);
|
|
|
|
return err;
|
|
}
|
|
|
|
int dsos__load_kernel(const char *vmlinux, symbol_filter_t filter,
|
|
int use_modules)
|
|
{
|
|
int err = -1;
|
|
struct dso *dso = dso__new(vmlinux);
|
|
|
|
if (dso == NULL)
|
|
return -1;
|
|
|
|
dso->short_name = "[kernel]";
|
|
kernel_map = map__new2(0, dso);
|
|
if (kernel_map == NULL)
|
|
goto out_delete_dso;
|
|
|
|
kernel_map->map_ip = kernel_map->unmap_ip = identity__map_ip;
|
|
|
|
if (use_modules && dsos__load_modules() < 0) {
|
|
pr_warning("Failed to load list of modules in use! "
|
|
"Continuing...\n");
|
|
use_modules = 0;
|
|
}
|
|
|
|
if (vmlinux) {
|
|
err = dso__load_vmlinux(dso, kernel_map, vmlinux, filter);
|
|
if (err > 0 && use_modules) {
|
|
int syms = dsos__load_modules_sym(filter);
|
|
|
|
if (syms < 0)
|
|
pr_warning("Failed to read module symbols!"
|
|
" Continuing...\n");
|
|
else
|
|
err += syms;
|
|
}
|
|
}
|
|
|
|
if (err <= 0)
|
|
err = kernel_maps__load_kallsyms(filter, use_modules);
|
|
|
|
if (err > 0) {
|
|
struct rb_node *node = rb_first(&dso->syms);
|
|
struct symbol *sym = rb_entry(node, struct symbol, rb_node);
|
|
|
|
kernel_map->start = sym->start;
|
|
node = rb_last(&dso->syms);
|
|
sym = rb_entry(node, struct symbol, rb_node);
|
|
kernel_map->end = sym->end;
|
|
|
|
dso->origin = DSO__ORIG_KERNEL;
|
|
kernel_maps__insert(kernel_map);
|
|
/*
|
|
* Now that we have all sorted out, just set the ->end of all
|
|
* maps:
|
|
*/
|
|
kernel_maps__fixup_end();
|
|
dsos__add(dso);
|
|
|
|
if (verbose)
|
|
kernel_maps__fprintf(stderr);
|
|
}
|
|
|
|
return err;
|
|
|
|
out_delete_dso:
|
|
dso__delete(dso);
|
|
return -1;
|
|
}
|
|
|
|
LIST_HEAD(dsos);
|
|
struct dso *vdso;
|
|
|
|
const char *vmlinux_name = "vmlinux";
|
|
int modules;
|
|
|
|
static void dsos__add(struct dso *dso)
|
|
{
|
|
list_add_tail(&dso->node, &dsos);
|
|
}
|
|
|
|
static struct dso *dsos__find(const char *name)
|
|
{
|
|
struct dso *pos;
|
|
|
|
list_for_each_entry(pos, &dsos, node)
|
|
if (strcmp(pos->name, name) == 0)
|
|
return pos;
|
|
return NULL;
|
|
}
|
|
|
|
struct dso *dsos__findnew(const char *name)
|
|
{
|
|
struct dso *dso = dsos__find(name);
|
|
|
|
if (!dso) {
|
|
dso = dso__new(name);
|
|
if (dso != NULL) {
|
|
dsos__add(dso);
|
|
dso__set_basename(dso);
|
|
}
|
|
}
|
|
|
|
return dso;
|
|
}
|
|
|
|
void dsos__fprintf(FILE *fp)
|
|
{
|
|
struct dso *pos;
|
|
|
|
list_for_each_entry(pos, &dsos, node)
|
|
dso__fprintf(pos, fp);
|
|
}
|
|
|
|
size_t dsos__fprintf_buildid(FILE *fp)
|
|
{
|
|
struct dso *pos;
|
|
size_t ret = 0;
|
|
|
|
list_for_each_entry(pos, &dsos, node) {
|
|
ret += dso__fprintf_buildid(pos, fp);
|
|
ret += fprintf(fp, " %s\n", pos->long_name);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int load_kernel(symbol_filter_t filter)
|
|
{
|
|
if (dsos__load_kernel(vmlinux_name, filter, modules) <= 0)
|
|
return -1;
|
|
|
|
vdso = dso__new("[vdso]");
|
|
if (!vdso)
|
|
return -1;
|
|
|
|
dsos__add(vdso);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void symbol__init(unsigned int priv_size)
|
|
{
|
|
elf_version(EV_CURRENT);
|
|
symbol__priv_size = priv_size;
|
|
}
|