[PATCH 3/3] perf unwind-libunwind: Fix base address for .eh_frame

[Namhyung Kim]

The base address of a DSO mapping should start at the start of the file.
Usually DSOs are mapped from the pgoff 0 so it doesn't matter when it
uses the start of the map address.  But generated DSOs for JIT codes
doesn't start from the 0 so it should subtract the offset to calculate
the .eh_frame table offsets correctly.

Fixes: dc2cf4ca866f ("perf unwind: Fix segbase for ld.lld linked objects")
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/util/unwind-libunwind-local.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/unwind-libunwind-local.c b/tools/perf/util/unwind-libunwind-local.c
index c0641882fd2f..5e5c3395a499 100644
--- a/tools/perf/util/unwind-libunwind-local.c
+++ b/tools/perf/util/unwind-libunwind-local.c
@@ -327,7 +327,7 @@ static int read_unwind_spec_eh_frame(struct dso *dso, struct unwind_info *ui,
 
 	maps__for_each_entry(thread__maps(ui->thread), map_node) {
 		struct map *map = map_node->map;
-		u64 start = map__start(map);
+		u64 start = map__start(map) - map__pgoff(map);
 
 		if (map__dso(map) == dso && start < base_addr)
 			base_addr = start;
-- 
2.43.0.472.g3155946c3a-goog