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![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
Be more clear about DSO long names and tell from which file kernel symbols were obtained, all in --verbose mode: [root@mica ~]# perf report -v > /dev/null Looking at the vmlinux_path (5 entries long) Using /lib/modules/2.6.33-rc8-tip-00777-g0918527-dirty/build/vmlinux for symbols [root@mica ~]# mv /lib/modules/2.6.33-rc8-tip-00777-g0918527-dirty/build/vmlinux /tmp/dd [root@mica ~]# perf report -v > /dev/null Looking at the vmlinux_path (5 entries long) Using /proc/kallsyms for symbols [root@mica ~]# Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1266866139-6361-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
237 lines
5 KiB
C
237 lines
5 KiB
C
#include "event.h"
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#include "symbol.h"
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "debug.h"
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const char *map_type__name[MAP__NR_TYPES] = {
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[MAP__FUNCTION] = "Functions",
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[MAP__VARIABLE] = "Variables",
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};
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static inline int is_anon_memory(const char *filename)
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{
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return strcmp(filename, "//anon") == 0;
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}
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static int strcommon(const char *pathname, char *cwd, int cwdlen)
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{
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int n = 0;
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while (n < cwdlen && pathname[n] == cwd[n])
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++n;
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return n;
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}
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void map__init(struct map *self, enum map_type type,
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u64 start, u64 end, u64 pgoff, struct dso *dso)
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{
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self->type = type;
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self->start = start;
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self->end = end;
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self->pgoff = pgoff;
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self->dso = dso;
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self->map_ip = map__map_ip;
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self->unmap_ip = map__unmap_ip;
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RB_CLEAR_NODE(&self->rb_node);
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}
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struct map *map__new(struct mmap_event *event, enum map_type type,
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char *cwd, int cwdlen)
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{
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struct map *self = malloc(sizeof(*self));
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if (self != NULL) {
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const char *filename = event->filename;
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char newfilename[PATH_MAX];
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struct dso *dso;
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int anon;
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if (cwd) {
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int n = strcommon(filename, cwd, cwdlen);
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if (n == cwdlen) {
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snprintf(newfilename, sizeof(newfilename),
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".%s", filename + n);
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filename = newfilename;
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}
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}
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anon = is_anon_memory(filename);
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if (anon) {
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snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", event->pid);
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filename = newfilename;
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}
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dso = dsos__findnew(filename);
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if (dso == NULL)
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goto out_delete;
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map__init(self, type, event->start, event->start + event->len,
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event->pgoff, dso);
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if (anon) {
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set_identity:
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self->map_ip = self->unmap_ip = identity__map_ip;
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} else if (strcmp(filename, "[vdso]") == 0) {
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dso__set_loaded(dso, self->type);
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goto set_identity;
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}
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}
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return self;
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out_delete:
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free(self);
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return NULL;
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}
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void map__delete(struct map *self)
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{
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free(self);
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}
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void map__fixup_start(struct map *self)
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{
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struct rb_root *symbols = &self->dso->symbols[self->type];
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struct rb_node *nd = rb_first(symbols);
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if (nd != NULL) {
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struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
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self->start = sym->start;
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}
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}
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void map__fixup_end(struct map *self)
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{
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struct rb_root *symbols = &self->dso->symbols[self->type];
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struct rb_node *nd = rb_last(symbols);
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if (nd != NULL) {
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struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
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self->end = sym->end;
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}
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}
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#define DSO__DELETED "(deleted)"
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int map__load(struct map *self, symbol_filter_t filter)
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{
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const char *name = self->dso->long_name;
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int nr;
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if (dso__loaded(self->dso, self->type))
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return 0;
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nr = dso__load(self->dso, self, filter);
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if (nr < 0) {
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if (self->dso->has_build_id) {
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char sbuild_id[BUILD_ID_SIZE * 2 + 1];
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build_id__sprintf(self->dso->build_id,
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sizeof(self->dso->build_id),
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sbuild_id);
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pr_warning("%s with build id %s not found",
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name, sbuild_id);
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} else
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pr_warning("Failed to open %s", name);
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pr_warning(", continuing without symbols\n");
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return -1;
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} else if (nr == 0) {
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const size_t len = strlen(name);
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const size_t real_len = len - sizeof(DSO__DELETED);
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if (len > sizeof(DSO__DELETED) &&
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strcmp(name + real_len + 1, DSO__DELETED) == 0) {
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pr_warning("%.*s was updated, restart the long "
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"running apps that use it!\n",
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(int)real_len, name);
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} else {
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pr_warning("no symbols found in %s, maybe install "
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"a debug package?\n", name);
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}
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return -1;
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}
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/*
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* Only applies to the kernel, as its symtabs aren't relative like the
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* module ones.
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*/
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if (self->dso->kernel)
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map__reloc_vmlinux(self);
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return 0;
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}
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struct symbol *map__find_symbol(struct map *self, u64 addr,
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symbol_filter_t filter)
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{
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if (map__load(self, filter) < 0)
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return NULL;
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return dso__find_symbol(self->dso, self->type, addr);
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}
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struct symbol *map__find_symbol_by_name(struct map *self, const char *name,
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symbol_filter_t filter)
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{
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if (map__load(self, filter) < 0)
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return NULL;
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if (!dso__sorted_by_name(self->dso, self->type))
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dso__sort_by_name(self->dso, self->type);
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return dso__find_symbol_by_name(self->dso, self->type, name);
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}
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struct map *map__clone(struct map *self)
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{
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struct map *map = malloc(sizeof(*self));
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if (!map)
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return NULL;
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memcpy(map, self, sizeof(*self));
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return map;
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}
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int map__overlap(struct map *l, struct map *r)
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{
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if (l->start > r->start) {
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struct map *t = l;
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l = r;
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r = t;
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}
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if (l->end > r->start)
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return 1;
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return 0;
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}
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size_t map__fprintf(struct map *self, FILE *fp)
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{
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return fprintf(fp, " %Lx-%Lx %Lx %s\n",
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self->start, self->end, self->pgoff, self->dso->name);
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}
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/*
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* objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
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* map->dso->adjust_symbols==1 for ET_EXEC-like cases.
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*/
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u64 map__rip_2objdump(struct map *map, u64 rip)
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{
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u64 addr = map->dso->adjust_symbols ?
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map->unmap_ip(map, rip) : /* RIP -> IP */
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rip;
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return addr;
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}
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u64 map__objdump_2ip(struct map *map, u64 addr)
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{
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u64 ip = map->dso->adjust_symbols ?
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addr :
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map->unmap_ip(map, addr); /* RIP -> IP */
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return ip;
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}
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