contrib: Add kernel_decode_stack.
BUG=b:160746866
TEST=Test board kukui/asurada/atlas with some stack trace.
Change-Id: Id5eed71accc8ab4e992e561b20d6555b55b59a01
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2289179
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Commit-Queue: Pi-Hsun Shih <pihsun@chromium.org>
Tested-by: Pi-Hsun Shih <pihsun@chromium.org>
diff --git a/contrib/kernel_decode_stack b/contrib/kernel_decode_stack
new file mode 100755
index 0000000..8ef0631
--- /dev/null
+++ b/contrib/kernel_decode_stack
@@ -0,0 +1,82 @@
+#!/bin/bash
+# Copyright 2020 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Loads script libraries.
+CONTRIB_DIR=$(dirname "$(readlink -f "$0")")
+. "${CONTRIB_DIR}/common.sh" || exit 1
+
+FLAGS_HELP="
+Decode kernel stack trace from kernel logs.
+
+Read kernel logs from stdin, and print the decoded stack trace to stdout.
+
+Usage:
+ kernel_decode_stack -b <board>
+"
+
+# Flags
+DEFINE_string board "${DEFAULT_BOARD}" "Which board to decode stack trace" b
+
+# Parse command line.
+FLAGS "$@" || exit 1
+eval set -- "${FLAGS_ARGV}"
+set -e
+
+# Script must be run inside the chroot.
+assert_inside_chroot
+
+decode_stacktrace() {
+ local board="$1"
+ shift
+
+ local CHOST
+ CHOST=$("portageq-${board}" envvar CHOST)
+
+ local ARCH
+ ARCH=$("portageq-${board}" envvar ARCH)
+
+ # cros-kernel2.eclass falls back to tc-arch-kernel when CHROMEOS_KERNEL_ARCH
+ # is not set, but since tc-arch-kernel parse the arch from CHOST, we can just
+ # ignnore kernel_arch and use the original CHOST as CROSS_COMPILE in this
+ # case.
+ local kernel_arch
+ kernel_arch=$("portageq-${board}" envvar CHROMEOS_KERNEL_ARCH || true)
+
+ # This part is from cros-kernel2.eclass
+ # Support 64bit kernels w/32bit userlands.
+ local cross=${CHOST}
+ if [[ "${ARCH}:${kernel_arch}" == "arm:arm64" ]]; then
+ cross="aarch64-cros-linux-gnu"
+ fi
+
+ # Note: This would point to some temporary path if the kernel is not worked
+ # on, but it's ok since the decode_stacktrace.sh only use this path to strip
+ # the output.
+ #
+ # This is also why we always use the decode_stacktrace.sh from
+ # kernel/upstream instead of using the one in kernel_source_path.
+ local kernel_source_path
+ kernel_source_path=$(
+ objdump -WL "/build/${board}/usr/lib/debug/boot/vmlinux" |
+ grep 'include/linux/compiler.h:$' |
+ head -1 |
+ sed 's|\(.*\)/include/linux/compiler.h:$|\1|')
+
+ CROSS_COMPILE="${cross}-" \
+ "${SRC_ROOT}/third_party/kernel/upstream/scripts/decode_stacktrace.sh" \
+ "/build/${board}/usr/lib/debug/boot/vmlinux" \
+ "${kernel_source_path}" \
+ "/build/${board}/usr/lib/debug/lib/modules/"*/
+}
+
+main() {
+ if [[ -z "${FLAGS_board}" ]]; then
+ die "-b or --board required."
+ fi
+
+ decode_stacktrace "${FLAGS_board}" "$@"
+}
+
+main "$@"
