linux-kernel - [RFC PATCH 5/8] perf probe powerpc: Allow matching against dot symbols

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Message-Id: <d23252a0bb8a34b2eac9049b34d674aa2d6a2b6a.1418146300.git.naveen.n.rao@linux.vnet.ibm.com>
Date:	Tue,  9 Dec 2014 23:04:03 +0530
From:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	acme@...nel.org, mpe@...erman.id.au
Cc:	ananth@...ibm.com
Subject: [RFC PATCH 5/8] perf probe powerpc: Allow matching against dot symbols

Allow perf probe to work on powerpc ABIv1 without the need to specify the
leading dot '.' for functions. 'perf probe do_fork' works with this patch.

Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
---
 tools/perf/util/probe-event.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index d465f7c..174c22e 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2221,6 +2221,15 @@ static int probe_function_filter(struct map *map __maybe_unused,
 		num_matched_functions++;
 		return 0;
 	}
+#ifdef __powerpc64__
+	/* Allow matching against the dot variant */
+	if (sym->name[0] == '.' && looking_function_name[0] != '.' &&
+	    (sym->binding == STB_GLOBAL || sym->binding == STB_LOCAL) &&
+	    strcmp(looking_function_name, sym->name+1) == 0) {
+		num_matched_functions++;
+		return 0;
+	}
+#endif
 	return 1;
 }
 
-- 
2.1.3

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