linux-kernel - [PATCH 17/22] perf annotate: Do not ignore call instruction with indirect target

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Date:   Tue, 20 Sep 2016 17:03:37 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Chris Riyder <chris.ryder@....com>,
        Hemant Kumar <hemant@...ux.vnet.ibm.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Markus Trippelsdorf <markus@...ppelsdorf.de>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Pawel Moll <pawel.moll@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Taeung Song <treeze.taeung@...il.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 17/22] perf annotate: Do not ignore call instruction with indirect target

From: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>

Do not ignore call instruction with indirect target when its already
identified as a call. This is an extension of commit e8ea1561952b ("perf
annotate: Use raw form for register indirect call instructions") to
generalize annotation for all instructions with indirect calls.

This is needed for certain powerpc call instructions that use address in
a register (such as bctrl, btarl, ...).

Apart from that, when kcore is used to disassemble function, all call
instructions were ignored. This patch will fix it as a side effect by
not ignoring them. For example,

Before (with kcore):
       mov    %r13,%rdi
       callq  0xffffffff811a7e70
     ^ jmpq   64
       mov    %gs:0x7ef41a6e(%rip),%al

After (with kcore):
       mov    %r13,%rdi
     > callq  0xffffffff811a7e70
     ^ jmpq   64
       mov    %gs:0x7ef41a6e(%rip),%al

Suggested-by: Michael Ellerman <mpe@...erman.id.au>
[Suggested about 'bctrl' instruction]
Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Chris Riyder <chris.ryder@....com>
Cc: Hemant Kumar <hemant@...ux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
Cc: Pawel Moll <pawel.moll@....com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Russell King <rmk+kernel@....linux.org.uk>
Cc: Taeung Song <treeze.taeung@...il.com>
Link: http://lkml.kernel.org/r/1471611578-11255-5-git-send-email-ravi.bangoria@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/annotate.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 7a80c7362a03..60e915f392a6 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -82,16 +82,12 @@ static int call__parse(struct ins_operands *ops)
 	return ops->target.name == NULL ? -1 : 0;
 
 indirect_call:
-	tok = strchr(endptr, '(');
-	if (tok != NULL) {
+	tok = strchr(endptr, '*');
+	if (tok == NULL) {
 		ops->target.addr = 0;
 		return 0;
 	}
 
-	tok = strchr(endptr, '*');
-	if (tok == NULL)
-		return -1;
-
 	ops->target.addr = strtoull(tok + 1, NULL, 16);
 	return 0;
 }
-- 
2.7.4