perf probe: Fix list result when address is zero

When manually added uprobe point with zero address, 'perf probe -l'
reports error. For example:

  # echo p:probe_libc/abs_0 /path/to/lib.bin:0x0 arg1=%ax > \
           /sys/kernel/debug/tracing/uprobe_events

  # perf probe -l
  Error: Failed to show event list.

Probing at 0x0 is possible and useful when lib.bin is not a normal
shared object but is manually mapped. However, in this case kernel
report:

  # cat /sys/kernel/debug/tracing/uprobe_events
  p:probe_libc/abs_0 /path/to/lib.bin:0x          (null) arg1=%ax

This patch supports the above kernel output.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1440586666-235233-5-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 25 insertions, 3 deletions

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index f7bacbb98865..926bcecc4a44 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1519,9 +1519,31 @@ int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
         } else
                 p = argv[1];
         fmt1_str = strtok_r(p, "+", &fmt);
-        if (fmt1_str[0] == '0') /* only the address started with 0x */
-                tp->address = strtoul(fmt1_str, NULL, 0);
-        else {
+        /* only the address started with 0x */
+        if (fmt1_str[0] == '0') {
+                /*
+                 * Fix a special case:
+                 * if address == 0, kernel reports something like:
+                 * p:probe_libc/abs_0 /lib/libc-2.18.so:0x          (null) arg1=%ax
+                 * Newer kernel may fix that, but we want to
+                 * support old kernel also.
+                 */
+                if (strcmp(fmt1_str, "0x") == 0) {
+                        if (!argv[2] || strcmp(argv[2], "(null)")) {
+                                ret = -EINVAL;
+                                goto out;
+                        }
+                        tp->address = 0;
+
+                        free(argv[2]);
+                        for (i = 2; argv[i + 1] != NULL; i++)
+                                argv[i] = argv[i + 1];
+
+                        argv[i] = NULL;
+                        argc -= 1;
+                } else
+                        tp->address = strtoul(fmt1_str, NULL, 0);
+        } else {
                 /* Only the symbol-based probe has offset */
                 tp->symbol = strdup(fmt1_str);
                 if (tp->symbol == NULL) {