6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Namhyung Kim <namhyung@xxxxxxxxxx>
[ Upstream commit c966d23a351a33f8a977fd7efbb6f467132f7383 ]
Usually DSOs are mapped from the beginning of the file, so the base
address of the DSO can be calculated by map->start - map->pgoff.
However, JIT DSOs which are generated by `perf inject -j`, are mapped
only the code segment. This makes unwind-libdw code confusing and
rejects processing unwinds in the JIT DSOs. It should use the map
start address as base for them to fix the confusion.
Fixes: 1fe627da30331024 ("perf unwind: Take pgoff into account when reporting elf to libdwfl")
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Fangrui Song <maskray@xxxxxxxxxx>
Cc: Ian Rogers <irogers@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Milian Wolff <milian.wolff@xxxxxxxx>
Cc: Pablo Galindo <pablogsal@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231212070547.612536-3-namhyung@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
tools/perf/util/unwind-libdw.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/tools/perf/util/unwind-libdw.c b/tools/perf/util/unwind-libdw.c
index 8554db3fc0d7..6013335a8dae 100644
--- a/tools/perf/util/unwind-libdw.c
+++ b/tools/perf/util/unwind-libdw.c
@@ -46,6 +46,7 @@ static int __report_module(struct addr_location *al, u64 ip,
{
Dwfl_Module *mod;
struct dso *dso = NULL;
+ Dwarf_Addr base;
/*
* Some callers will use al->sym, so we can't just use the
* cheaper thread__find_map() here.
@@ -58,13 +59,25 @@ static int __report_module(struct addr_location *al, u64 ip,
if (!dso)
return 0;
+ /*
+ * The generated JIT DSO files only map the code segment without
+ * ELF headers. Since JIT codes used to be packed in a memory
+ * segment, calculating the base address using pgoff falls into
+ * a different code in another DSO. So just use the map->start
+ * directly to pick the correct one.
+ */
+ if (!strncmp(dso->long_name, "/tmp/jitted-", 12))
+ base = map__start(al->map);
+ else
+ base = map__start(al->map) - map__pgoff(al->map);
+
mod = dwfl_addrmodule(ui->dwfl, ip);
if (mod) {
Dwarf_Addr s;
dwfl_module_info(mod, NULL, &s, NULL, NULL, NULL, NULL, NULL);
- if (s != map__start(al->map) - map__pgoff(al->map))
- mod = 0;
+ if (s != base)
+ mod = NULL;
}
if (!mod) {
@@ -72,14 +85,14 @@ static int __report_module(struct addr_location *al, u64 ip,
__symbol__join_symfs(filename, sizeof(filename), dso->long_name);
mod = dwfl_report_elf(ui->dwfl, dso->short_name, filename, -1,
- map__start(al->map) - map__pgoff(al->map), false);
+ base, false);
}
if (!mod) {
char filename[PATH_MAX];
if (dso__build_id_filename(dso, filename, sizeof(filename), false))
mod = dwfl_report_elf(ui->dwfl, dso->short_name, filename, -1,
- map__start(al->map) - map__pgoff(al->map), false);
+ base, false);
}
if (mod) {
--
2.43.0
