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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2016-04-12 14:40:49 +0530
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-05-05 21:04:02 -0300
commit239aeba764092b29dd7cab177cd47f472390622e (patch)
treecc917bab88b9b11e60d98557831ea922d0103d2a /tools/perf/arch
parent7cecb7fe8388d5c39708d7f07e642ed31bb9d4fe (diff)
perf powerpc: Fix kprobe and kretprobe handling with kallsyms on ppc64le
So far, we used to treat probe point offsets as being offset from the LEP. However, userspace applications (objdump/readelf) always show disassembly and offsets from the function GEP. This is confusing to the user as we will end up probing at an address different from what the user expects when looking at the function disassembly with readelf/objdump. Fix this by changing how we modify probe address with perf. If only the function name is provided, we assume the user needs the LEP. Otherwise, if an offset is specified, we assume that the user knows the exact address to probe based on function disassembly, and so we just place the probe from the GEP offset. Finally, kretprobe was also broken with kallsyms as we were trying to specify an offset. This patch also fixes that issue. Reported-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Cc: Mark Wielaard <mjw@redhat.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/75df860aad8216bf4b9bcd10c6351ecc0e3dee54.1460451721.git.naveen.n.rao@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/arch')
-rw-r--r--tools/perf/arch/powerpc/util/sym-handling.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/tools/perf/arch/powerpc/util/sym-handling.c b/tools/perf/arch/powerpc/util/sym-handling.c
index bbc1a50768dd..6974ba0fa065 100644
--- a/tools/perf/arch/powerpc/util/sym-handling.c
+++ b/tools/perf/arch/powerpc/util/sym-handling.c
@@ -71,12 +71,21 @@ void arch__fix_tev_from_maps(struct perf_probe_event *pev,
struct probe_trace_event *tev, struct map *map)
{
/*
- * ppc64 ABIv2 local entry point is currently always 2 instructions
- * (8 bytes) after the global entry point.
+ * When probing at a function entry point, we normally always want the
+ * LEP since that catches calls to the function through both the GEP and
+ * the LEP. Hence, we would like to probe at an offset of 8 bytes if
+ * the user only specified the function entry.
+ *
+ * However, if the user specifies an offset, we fall back to using the
+ * GEP since all userspace applications (objdump/readelf) show function
+ * disassembly with offsets from the GEP.
+ *
+ * In addition, we shouldn't specify an offset for kretprobes.
*/
- if (!pev->uprobes && map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) {
- tev->point.address += PPC64LE_LEP_OFFSET;
+ if (pev->point.offset || pev->point.retprobe || !map)
+ return;
+
+ if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS)
tev->point.offset += PPC64LE_LEP_OFFSET;
- }
}
#endif