[PATCH 40/46] perf map: Consider PTI entry trampolines in rip_2objdump()

Arnaldo Carvalho de Melo
2018-06-05T17:52:42Z

From: Adrian Hunter <adrian.hunter@intel.com>

perf tools uses map__rip_2objdump() to calculate objdump virtual addresses.
map__rip_2objdump() needs to be amended to deal with PTI entry trampolines.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1528183800-21577-1-git-send-email-adrian.hunter@intel.com
[ split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/map.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 92abc8e248c5..89ac5b5dc218 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -449,6 +449,20 @@ int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
*/
u64 map__rip_2objdump(struct map *map, u64 rip)
{
+ struct kmap *kmap = __map__kmap(map);
+
+ /*
+ * vmlinux does not have program headers for PTI entry trampolines and
+ * kcore may not either. However the trampoline object code is on the
+ * main kernel map, so just use that instead.
+ */
+ if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps && kmap->kmaps->machine) {
+ struct map *kernel_map = machine__kernel_map(kmap->kmaps->machine);
+
+ if (kernel_map)
+ map = kernel_map;
+ }
+
if (!map->dso->adjust_symbols)
return rip;

--
2.14.3