[PATCH 01/13] perf uretprobe ppc64le: Fix probe location

From: Arnaldo Carvalho de Melo
Date: Thu Oct 06 2016 - 12:14:47 EST


From: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxxxxxxx>

Perf uretprobe probes on GEP(Global Entry Point) which fails to record
all function calls via LEP(Local Entry Point). Fix that by probing on LEP.

Objdump:

00000000100005f0 <doit>:
100005f0: 02 10 40 3c lis r2,4098
100005f4: 00 7f 42 38 addi r2,r2,32512
100005f8: a6 02 08 7c mflr r0
100005fc: 10 00 01 f8 std r0,16(r1)
10000600: f8 ff e1 fb std r31,-8(r1)

Before applying patch:

$ cat /sys/kernel/debug/tracing/uprobe_events
r:probe_uprobe_test/doit /home/ravi/uprobe_test:0x00000000000005f0

After applying patch:

$ cat /sys/kernel/debug/tracing/uprobe_events
r:probe_uprobe_test/doit /home/ravi/uprobe_test:0x00000000000005f8

This is not the case with kretprobes because the kernel itself finds LEP
and probes on it.

Signed-off-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Balbir Singh <bsingharora@xxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1475576865-6562-1-git-send-email-ravi.bangoria@xxxxxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/arch/powerpc/util/sym-handling.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/arch/powerpc/util/sym-handling.c b/tools/perf/arch/powerpc/util/sym-handling.c
index ed9d5d15d5b6..1030a6e504bb 100644
--- a/tools/perf/arch/powerpc/util/sym-handling.c
+++ b/tools/perf/arch/powerpc/util/sym-handling.c
@@ -82,7 +82,8 @@ void arch__fix_tev_from_maps(struct perf_probe_event *pev,
*
* In addition, we shouldn't specify an offset for kretprobes.
*/
- if (pev->point.offset || pev->point.retprobe || !map || !sym)
+ if (pev->point.offset || (!pev->uprobes && pev->point.retprobe) ||
+ !map || !sym)
return;

lep_offset = PPC64_LOCAL_ENTRY_OFFSET(sym->arch_sym);
--
2.7.4