linux-kernel - [PATCH] perf unwind: check symsrc ELF for .debug

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Date:	Wed, 10 Aug 2016 15:36:16 +0200
From:	Rabin Vincent <rabin.vincent@...s.com>
To:	acme@...nel.org
Cc:	linux-kernel@...r.kernel.org, Rabin Vincent <rabinv@...s.com>
Subject: [PATCH] perf unwind: check symsrc ELF for .debug_frame

From: Rabin Vincent <rabinv@...s.com>

When using split debug info, the file without debug info may not have a
.debug_frame section, so we need to check the symsrc ELF also, since
that's the file we actually read the unwind information from.

Signed-off-by: Rabin Vincent <rabinv@...s.com>
---
 tools/perf/util/unwind-libunwind-local.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/perf/util/unwind-libunwind-local.c b/tools/perf/util/unwind-libunwind-local.c
index 97c0f8f..d492192 100644
--- a/tools/perf/util/unwind-libunwind-local.c
+++ b/tools/perf/util/unwind-libunwind-local.c
@@ -308,6 +308,20 @@ static int read_unwind_spec_debug_frame(struct dso *dso,
 		dso__data_put_fd(dso);
 	}
 
+	/*
+	 * With split debug info, the file without debug info may not have a
+	 * .debug_frame, so check the symsrc too.
+	 */
+	if (ofs == 0 && dso->symsrc_filename) {
+		fd = open(dso->symsrc_filename, O_RDONLY);
+		if (fd < 0)
+			return -EINVAL;
+
+		ofs = elf_section_offset(fd, ".debug_frame");
+		dso->data.debug_frame_offset = ofs;
+		close(fd);
+	}
+
 	*offset = ofs;
 	if (*offset)
 		return 0;
-- 
2.1.4