perf annotate: Allow disassembly using /proc/kcore

Annotation with /proc/kcore is possible so the logic is adjusted to
allow it.  The main difference is that /proc/kcore had no symbols so the
parsing logic needed a tweak to read jump offsets.

The other difference is that objdump cannot always read from kcore.
That seems to be a bug with objdump.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1375875537-4509-11-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 11 insertions, 5 deletions

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 9101f7cf2587..440c3b371401 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -103,7 +103,8 @@ static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
         /*
          * We can't annotate with just /proc/kallsyms
          */
-        if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) {
+        if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
+            !dso__is_kcore(map->dso)) {
                 pr_err("Can't annotate %s: No vmlinux file was found in the "
                        "path\n", sym->name);
                 sleep(1);
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index d102716c43a1..4ab2f11ee6f4 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -110,10 +110,10 @@ static int jump__parse(struct ins_operands *ops)
 {
         const char *s = strchr(ops->raw, '+');
 
-        ops->target.addr = strtoll(ops->raw, NULL, 16);
+        ops->target.addr = strtoull(ops->raw, NULL, 16);
 
         if (s++ != NULL)
-                ops->target.offset = strtoll(s, NULL, 16);
+                ops->target.offset = strtoull(s, NULL, 16);
         else
                 ops->target.offset = UINT64_MAX;
 
@@ -821,6 +821,10 @@ static int symbol__parse_objdump_line(struct symbol *sym, struct map *map,
         if (dl == NULL)
                 return -1;
 
+        if (dl->ops.target.offset == UINT64_MAX)
+                dl->ops.target.offset = dl->ops.target.addr -
+                                        map__rip_2objdump(map, sym->start);
+
         disasm__add(&notes->src->source, dl);
 
         return 0;
@@ -864,7 +868,8 @@ fallback:
                 free_filename = false;
         }
 
-        if (dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) {
+        if (dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
+            !dso__is_kcore(dso)) {
                 char bf[BUILD_ID_SIZE * 2 + 16] = " with build id ";
                 char *build_id_msg = NULL;
 
@@ -898,7 +903,7 @@ fallback:
         snprintf(command, sizeof(command),
                  "%s %s%s --start-address=0x%016" PRIx64
                  " --stop-address=0x%016" PRIx64
-                 " -d %s %s -C %s|grep -v %s|expand",
+                 " -d %s %s -C %s 2>/dev/null|grep -v %s|expand",
                  objdump_path ? objdump_path : "objdump",
                  disassembler_style ? "-M " : "",
                  disassembler_style ? disassembler_style : "",