summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/symbol.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/perf/util/symbol.c')
-rw-r--r--tools/perf/util/symbol.c139
1 files changed, 106 insertions, 33 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 439ab947daf4..15ccfba8cdf8 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -22,6 +22,10 @@
#include <limits.h>
#include <sys/utsname.h>
+#ifndef KSYM_NAME_LEN
+#define KSYM_NAME_LEN 128
+#endif
+
#ifndef NT_GNU_BUILD_ID
#define NT_GNU_BUILD_ID 3
#endif
@@ -41,6 +45,7 @@ struct symbol_conf symbol_conf = {
.exclude_other = true,
.use_modules = true,
.try_vmlinux_path = true,
+ .symfs = "",
};
int dso__name_len(const struct dso *self)
@@ -92,7 +97,7 @@ static void symbols__fixup_end(struct rb_root *self)
prev = curr;
curr = rb_entry(nd, struct symbol, rb_node);
- if (prev->end == prev->start)
+ if (prev->end == prev->start && prev->end != curr->start)
prev->end = curr->start - 1;
}
@@ -121,7 +126,7 @@ static void __map_groups__fixup_end(struct map_groups *self, enum map_type type)
* We still haven't the actual symbols, so guess the
* last map final address.
*/
- curr->end = ~0UL;
+ curr->end = ~0ULL;
}
static void map_groups__fixup_end(struct map_groups *self)
@@ -425,16 +430,25 @@ size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp)
int kallsyms__parse(const char *filename, void *arg,
int (*process_symbol)(void *arg, const char *name,
- char type, u64 start))
+ char type, u64 start, u64 end))
{
char *line = NULL;
size_t n;
- int err = 0;
+ int err = -1;
+ u64 prev_start = 0;
+ char prev_symbol_type = 0;
+ char *prev_symbol_name;
FILE *file = fopen(filename, "r");
if (file == NULL)
goto out_failure;
+ prev_symbol_name = malloc(KSYM_NAME_LEN);
+ if (prev_symbol_name == NULL)
+ goto out_close;
+
+ err = 0;
+
while (!feof(file)) {
u64 start;
int line_len, len;
@@ -454,14 +468,33 @@ int kallsyms__parse(const char *filename, void *arg,
continue;
symbol_type = toupper(line[len]);
- symbol_name = line + len + 2;
+ len += 2;
+ symbol_name = line + len;
+ len = line_len - len;
- err = process_symbol(arg, symbol_name, symbol_type, start);
- if (err)
+ if (len >= KSYM_NAME_LEN) {
+ err = -1;
break;
+ }
+
+ if (prev_symbol_type) {
+ u64 end = start;
+ if (end != prev_start)
+ --end;
+ err = process_symbol(arg, prev_symbol_name,
+ prev_symbol_type, prev_start, end);
+ if (err)
+ break;
+ }
+
+ memcpy(prev_symbol_name, symbol_name, len + 1);
+ prev_symbol_type = symbol_type;
+ prev_start = start;
}
+ free(prev_symbol_name);
free(line);
+out_close:
fclose(file);
return err;
@@ -483,7 +516,7 @@ static u8 kallsyms2elf_type(char type)
}
static int map__process_kallsym_symbol(void *arg, const char *name,
- char type, u64 start)
+ char type, u64 start, u64 end)
{
struct symbol *sym;
struct process_kallsyms_args *a = arg;
@@ -492,11 +525,8 @@ static int map__process_kallsym_symbol(void *arg, const char *name,
if (!symbol_type__is_a(type, a->map->type))
return 0;
- /*
- * Will fix up the end later, when we have all symbols sorted.
- */
- sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
-
+ sym = symbol__new(start, end - start + 1,
+ kallsyms2elf_type(type), name);
if (sym == NULL)
return -ENOMEM;
/*
@@ -649,7 +679,6 @@ int dso__load_kallsyms(struct dso *self, const char *filename,
if (dso__load_all_kallsyms(self, filename, map) < 0)
return -1;
- symbols__fixup_end(&self->symbols[map->type]);
if (self->kernel == DSO_TYPE_GUEST_KERNEL)
self->origin = DSO__ORIG_GUEST_KERNEL;
else
@@ -839,8 +868,11 @@ static int dso__synthesize_plt_symbols(struct dso *self, struct map *map,
char sympltname[1024];
Elf *elf;
int nr = 0, symidx, fd, err = 0;
+ char name[PATH_MAX];
- fd = open(self->long_name, O_RDONLY);
+ snprintf(name, sizeof(name), "%s%s",
+ symbol_conf.symfs, self->long_name);
+ fd = open(name, O_RDONLY);
if (fd < 0)
goto out;
@@ -1452,16 +1484,19 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
self->origin++) {
switch (self->origin) {
case DSO__ORIG_BUILD_ID_CACHE:
- if (dso__build_id_filename(self, name, size) == NULL)
+ /* 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 DSO__ORIG_FEDORA:
- snprintf(name, size, "/usr/lib/debug%s.debug",
- self->long_name);
+ snprintf(name, size, "%s/usr/lib/debug%s.debug",
+ symbol_conf.symfs, self->long_name);
break;
case DSO__ORIG_UBUNTU:
- snprintf(name, size, "/usr/lib/debug%s",
- self->long_name);
+ snprintf(name, size, "%s/usr/lib/debug%s",
+ symbol_conf.symfs, self->long_name);
break;
case DSO__ORIG_BUILDID: {
char build_id_hex[BUILD_ID_SIZE * 2 + 1];
@@ -1473,19 +1508,26 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
sizeof(self->build_id),
build_id_hex);
snprintf(name, size,
- "/usr/lib/debug/.build-id/%.2s/%s.debug",
- build_id_hex, build_id_hex + 2);
+ "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
+ symbol_conf.symfs, build_id_hex, build_id_hex + 2);
}
break;
case DSO__ORIG_DSO:
- snprintf(name, size, "%s", self->long_name);
+ snprintf(name, size, "%s%s",
+ symbol_conf.symfs, self->long_name);
break;
case DSO__ORIG_GUEST_KMODULE:
if (map->groups && map->groups->machine)
root_dir = map->groups->machine->root_dir;
else
root_dir = "";
- snprintf(name, size, "%s%s", root_dir, self->long_name);
+ snprintf(name, size, "%s%s%s", symbol_conf.symfs,
+ root_dir, self->long_name);
+ break;
+
+ case DSO__ORIG_KMODULE:
+ snprintf(name, size, "%s%s", symbol_conf.symfs,
+ self->long_name);
break;
default:
@@ -1784,17 +1826,20 @@ 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];
- fd = open(vmlinux, O_RDONLY);
+ 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, vmlinux, fd, filter, 0, 0);
+ err = dso__load_sym(self, map, symfs_vmlinux, fd, filter, 0, 0);
close(fd);
if (err > 0)
- pr_debug("Using %s for symbols\n", vmlinux);
+ pr_debug("Using %s for symbols\n", symfs_vmlinux);
return err;
}
@@ -1836,8 +1881,8 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
const char *kallsyms_filename = NULL;
char *kallsyms_allocated_filename = NULL;
/*
- * Step 1: if the user specified a vmlinux filename, use it and only
- * it, reporting errors to the user if it cannot be used.
+ * 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
@@ -1850,6 +1895,11 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
* 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);
@@ -1867,6 +1917,10 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
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,
@@ -2136,7 +2190,7 @@ struct process_args {
};
static int symbol__in_kernel(void *arg, const char *name,
- char type __used, u64 start)
+ char type __used, u64 start, u64 end __used)
{
struct process_args *args = arg;
@@ -2257,9 +2311,6 @@ static int vmlinux_path__init(void)
struct utsname uts;
char bf[PATH_MAX];
- if (uname(&uts) < 0)
- return -1;
-
vmlinux_path = malloc(sizeof(char *) * 5);
if (vmlinux_path == NULL)
return -1;
@@ -2272,6 +2323,14 @@ static int vmlinux_path__init(void)
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)
@@ -2331,6 +2390,8 @@ static int setup_list(struct strlist **list, const char *list_str,
int symbol__init(void)
{
+ const char *symfs;
+
if (symbol_conf.initialized)
return 0;
@@ -2359,6 +2420,18 @@ int symbol__init(void)
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;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 19:05:31 +0100