The patch titled
Subject: scripts/gdb: add kernel config dumping command
has been added to the -mm tree. Its filename is
scripts-gdb-add-kernel-config-dumping-command.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/scripts-gdb-add-kernel-config-dumping-command.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/scripts-gdb-add-kernel-config-dumping-command.patch
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------------------------------------------------------
From: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Subject: scripts/gdb: add kernel config dumping command
lx-configdump <file> dumps the contents of the gzipped .config to a text
file when the config is included in the kernel with CONFIG_IKCONFIG. By
default, the file written is called config.txt, but it can be any user
supplied filename as well. If the kernel config is in a module
(configs.ko), then it can be loaded along with symbols for the module
loaded with 'lx-symbols' and then this command will still work.
Obviously if you have the whole vmlinux then this can also be achieved
with scripts/extract-ikconfig, but this gdb script can be useful to
confirm that the memory contents of the config in memory and the vmlinux
contents on disk match what is expected.
Link: http://lkml.kernel.org/r/20190325184522.260535-3-swboyd@xxxxxxxxxxxx
Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Cc: Nikolay Borisov <n.borisov.lkml@xxxxxxxxx>
Cc: Kieran Bingham <kbingham@xxxxxxxxxx>
Cc: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Cc: Jackie Liu <liuyun01@xxxxxxxxxx>
Cc: Jason Wessel <jason.wessel@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/gdb/linux/config.py | 48 ++++++++++++++++++++++++++++++++++
scripts/gdb/vmlinux-gdb.py | 1
2 files changed, 49 insertions(+)
--- /dev/null
+++ a/scripts/gdb/linux/config.py
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright 2019 Google LLC.
+
+import gdb
+import zlib
+
+from linux import utils
+
+class LxConfigDump(gdb.Command):
+ """Output kernel config to the filename specified as the command
+ argument. Equivalent to 'zcat /proc/config.gz > config.txt' on
+ a running target"""
+
+ def __init__(self):
+ super(LxConfigDump, self).__init__("lx-configdump", gdb.COMMAND_DATA,
+ gdb.COMPLETE_FILENAME)
+
+ def invoke(self, arg, from_tty):
+ if len(arg) == 0:
+ filename = "config.txt"
+ else:
+ filename = arg
+
+ try:
+ py_config_ptr = gdb.parse_and_eval(
+ "kernel_config_data + 8")
+ py_config_size = gdb.parse_and_eval(
+ "sizeof(kernel_config_data) - 2 - 8 * 2")
+ except:
+ raise gdb.GdbError("Can't find config, enable CONFIG_IKCONFIG?")
+
+ inf = gdb.inferiors()[0]
+ zconfig_buf = utils.read_memoryview(inf, py_config_ptr,
+ py_config_size).tobytes()
+
+ config_buf = zlib.decompress(zconfig_buf, 16)
+ try:
+ f = open(filename, 'wb')
+ except:
+ raise gdb.GdbError("Could not open file to dump config")
+
+ f.write(config_buf)
+ f.close()
+
+ gdb.write("Dumped config to " + filename + "\n")
+
+LxConfigDump()
--- a/scripts/gdb/vmlinux-gdb.py~scripts-gdb-add-kernel-config-dumping-command
+++ a/scripts/gdb/vmlinux-gdb.py
@@ -27,6 +27,7 @@ else:
import linux.modules
import linux.dmesg
import linux.tasks
+ import linux.config
import linux.cpus
import linux.lists
import linux.proc
_
Patches currently in -mm which might be from swboyd@xxxxxxxxxxxx are
scripts-gdb-find-vmlinux-where-it-was-before.patch
scripts-gdb-add-kernel-config-dumping-command.patch
scripts-gdb-add-rb-tree-iterating-utilities.patch
scripts-gdb-add-a-timer-list-command.patch
