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perf probe: Support comp_dir to find an absolute source path

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Gcc generates DW_AT_comp_dir and stores relative source path if building kernel
without O= option. In that case, perf probe --line sometimes doesn't work
without --source option, because it tries to access relative source path.

This adds DW_AT_comp_dir support to perf probe for finding an absolute source
path when no --source option.

LKML-Reference: <4C36EBE7.3060802@hitachi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu
2010-07-09 18:29:11 +09:00
committed by Arnaldo Carvalho de Melo
parent 7cf0b79e6f
commit 6a330a3c8a
3 changed files with 44 additions and 12 deletions
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34
tools/perf/util/probe-event.c
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@@ -201,28 +201,38 @@ static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
* a newly allocated path on success.
* Return 0 if file was found and readable, -errno otherwise.
*/
static int get_real_path(const char *raw_path, char **new_path)
static int get_real_path(const char *raw_path, const char *comp_dir,
char **new_path)
{
if (!symbol_conf.source_prefix) {
if (access(raw_path, R_OK) == 0) {
*new_path = strdup(raw_path);
return 0;
} else
return -errno;
const char *prefix = symbol_conf.source_prefix;
if (!prefix) {
if (raw_path[0] != '/' && comp_dir)
/* If not an absolute path, try to use comp_dir */
prefix = comp_dir;
else {
if (access(raw_path, R_OK) == 0) {
*new_path = strdup(raw_path);
return 0;
} else
return -errno;
}
}
*new_path = malloc((strlen(symbol_conf.source_prefix) +
strlen(raw_path) + 2));
*new_path = malloc((strlen(prefix) + strlen(raw_path) + 2));
if (!*new_path)
return -ENOMEM;
for (;;) {
sprintf(*new_path, "%s/%s", symbol_conf.source_prefix,
raw_path);
sprintf(*new_path, "%s/%s", prefix, raw_path);
if (access(*new_path, R_OK) == 0)
return 0;
if (!symbol_conf.source_prefix)
/* In case of searching comp_dir, don't retry */
return -errno;
switch (errno) {
case ENAMETOOLONG:
case ENOENT:
@@ -318,7 +328,7 @@ int show_line_range(struct line_range *lr)
/* Convert source file path */
tmp = lr->path;
ret = get_real_path(tmp, &lr->path);
ret = get_real_path(tmp, lr->comp_dir, &lr->path);
free(tmp); /* Free old path */
if (ret < 0) {
pr_warning("Failed to find source file. (%d)\n", ret);