[PATCH] Properly interpret indirect call in perf annotate.

From: "Martin Liška" <mliska@suse.cz>
To: linux-perf-users@vger.kernel.org, lkml <linux-kernel@vger.kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>, Jiri Olsa <jolsa@redhat.com>
Subject: [PATCH] Properly interpret indirect call in perf annotate.
Date: Thu, 23 Aug 2018 14:29:34 +0200	[thread overview]
Message-ID: <bd1f3932-be2b-85f9-7582-111ee0a43b07@suse.cz> (raw)

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The patch changes interpretation of:
callq  *0x8(%rbx)

from:
  0.26 │     → callq  *8
to:
  0.26 │     → callq  *0x8(%rbx)

in this can an address is followed by a register, thus
one can't parse only address.

Signed-off-by: Martin Liška <mliska@suse.cz>
---
 tools/perf/util/annotate.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)



[-- Attachment #2: 0001-Properly-interpret-indirect-call-in-perf-annotate.patch --]
[-- Type: text/x-patch, Size: 668 bytes --]

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index e4268b948e0e..e32ead4744bd 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -246,8 +246,14 @@ static int call__parse(struct arch *arch, struct ins_operands *ops, struct map_s
 
 indirect_call:
 	tok = strchr(endptr, '*');
-	if (tok != NULL)
-		ops->target.addr = strtoull(tok + 1, NULL, 16);
+	if (tok != NULL) {
+		endptr++;
+
+		/* Indirect call can use a non-rip register and offset: callq  *0x8(%rbx).
+		 * Do not parse such instruction.  */
+		if (strstr(endptr, "(%r") == NULL)
+			ops->target.addr = strtoull(endptr, NULL, 16);
+	}
 	goto find_target;
 }
 

