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-rw-r--r--tools/perf/util/symbol.c65
1 files changed, 59 insertions, 6 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 39ce9adbaaf0..a9d758a3b371 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -627,7 +627,7 @@ static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
* kernel range is broken in several maps, named [kernel].N, as we don't have
* the original ELF section names vmlinux have.
*/
-static int dso__split_kallsyms(struct dso *dso, struct map *map,
+static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
symbol_filter_t filter)
{
struct map_groups *kmaps = map__kmap(map)->kmaps;
@@ -692,6 +692,12 @@ static int dso__split_kallsyms(struct dso *dso, struct map *map,
char dso_name[PATH_MAX];
struct dso *ndso;
+ if (delta) {
+ /* Kernel was relocated at boot time */
+ pos->start -= delta;
+ pos->end -= delta;
+ }
+
if (count == 0) {
curr_map = map;
goto filter_symbol;
@@ -721,6 +727,10 @@ static int dso__split_kallsyms(struct dso *dso, struct map *map,
curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
map_groups__insert(kmaps, curr_map);
++kernel_range;
+ } else if (delta) {
+ /* Kernel was relocated at boot time */
+ pos->start -= delta;
+ pos->end -= delta;
}
filter_symbol:
if (filter && filter(curr_map, pos)) {
@@ -976,6 +986,23 @@ static int validate_kcore_modules(const char *kallsyms_filename,
return 0;
}
+static int validate_kcore_addresses(const char *kallsyms_filename,
+ struct map *map)
+{
+ struct kmap *kmap = map__kmap(map);
+
+ if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
+ u64 start;
+
+ start = kallsyms__get_function_start(kallsyms_filename,
+ kmap->ref_reloc_sym->name);
+ if (start != kmap->ref_reloc_sym->addr)
+ return -EINVAL;
+ }
+
+ return validate_kcore_modules(kallsyms_filename, map);
+}
+
struct kcore_mapfn_data {
struct dso *dso;
enum map_type type;
@@ -1019,8 +1046,8 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
kallsyms_filename))
return -EINVAL;
- /* All modules must be present at their original addresses */
- if (validate_kcore_modules(kallsyms_filename, map))
+ /* Modules and kernel must be present at their original addresses */
+ if (validate_kcore_addresses(kallsyms_filename, map))
return -EINVAL;
md.dso = dso;
@@ -1113,15 +1140,41 @@ out_err:
return -EINVAL;
}
+/*
+ * If the kernel is relocated at boot time, kallsyms won't match. Compute the
+ * delta based on the relocation reference symbol.
+ */
+static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
+{
+ struct kmap *kmap = map__kmap(map);
+ u64 addr;
+
+ if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
+ return 0;
+
+ addr = kallsyms__get_function_start(filename,
+ kmap->ref_reloc_sym->name);
+ if (!addr)
+ return -1;
+
+ *delta = addr - kmap->ref_reloc_sym->addr;
+ return 0;
+}
+
int dso__load_kallsyms(struct dso *dso, const char *filename,
struct map *map, symbol_filter_t filter)
{
+ u64 delta = 0;
+
if (symbol__restricted_filename(filename, "/proc/kallsyms"))
return -1;
if (dso__load_all_kallsyms(dso, filename, map) < 0)
return -1;
+ if (kallsyms__delta(map, filename, &delta))
+ return -1;
+
symbols__fixup_duplicate(&dso->symbols[map->type]);
symbols__fixup_end(&dso->symbols[map->type]);
@@ -1133,7 +1186,7 @@ int dso__load_kallsyms(struct dso *dso, const char *filename,
if (!dso__load_kcore(dso, map, filename))
return dso__split_kallsyms_for_kcore(dso, map, filter);
else
- return dso__split_kallsyms(dso, map, filter);
+ return dso__split_kallsyms(dso, map, delta, filter);
}
static int dso__load_perf_map(struct dso *dso, struct map *map,
@@ -1424,7 +1477,7 @@ static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
continue;
scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
"%s/%s/kallsyms", dir, dent->d_name);
- if (!validate_kcore_modules(kallsyms_filename, map)) {
+ if (!validate_kcore_addresses(kallsyms_filename, map)) {
strlcpy(dir, kallsyms_filename, dir_sz);
ret = 0;
break;
@@ -1479,7 +1532,7 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
if (fd != -1) {
close(fd);
/* If module maps match go with /proc/kallsyms */
- if (!validate_kcore_modules("/proc/kallsyms", map))
+ if (!validate_kcore_addresses("/proc/kallsyms", map))
goto proc_kallsyms;
}