From: Stephen Boyd <swboyd@chromium.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Douglas Anderson <dianders@chromium.org>,
Nikolay Borisov <n.borisov.lkml@gmail.com>,
Kieran Bingham <kbingham@kernel.org>,
Jan Kiszka <jan.kiszka@siemens.com>,
Jackie Liu <liuyun01@kylinos.cn>
Subject: [PATCH 2/4] scripts/gdb: Add kernel config dumping command
Date: Mon, 25 Mar 2019 11:45:20 -0700 [thread overview]
Message-ID: <20190325184522.260535-3-swboyd@chromium.org> (raw)
In-Reply-To: <20190325184522.260535-1-swboyd@chromium.org>
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.
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Nikolay Borisov <n.borisov.lkml@gmail.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Jackie Liu <liuyun01@kylinos.cn>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
scripts/gdb/linux/config.py | 48 +++++++++++++++++++++++++++++++++++++
scripts/gdb/vmlinux-gdb.py | 1 +
2 files changed, 49 insertions(+)
create mode 100644 scripts/gdb/linux/config.py
diff --git a/scripts/gdb/linux/config.py b/scripts/gdb/linux/config.py
new file mode 100644
index 000000000000..400f09bb2665
--- /dev/null
+++ b/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()
diff --git a/scripts/gdb/vmlinux-gdb.py b/scripts/gdb/vmlinux-gdb.py
index 6e0b0afd888a..be0efb5dda5b 100644
--- a/scripts/gdb/vmlinux-gdb.py
+++ b/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
--
Sent by a computer through tubes
next prev parent reply other threads:[~2019-03-25 18:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-25 18:45 [PATCH 0/4] gdb script for kconfig and timer list Stephen Boyd
2019-03-25 18:45 ` [PATCH 1/4] scripts/gdb: Find vmlinux where it was before Stephen Boyd
2019-03-25 18:45 ` Stephen Boyd [this message]
2019-03-25 18:45 ` [PATCH 3/4] scripts/gdb: Add rb tree iterating utilities Stephen Boyd
2019-03-26 8:52 ` Kieran Bingham
2019-03-26 17:05 ` Stephen Boyd
2019-03-26 17:21 ` Jan Kiszka
2019-03-26 20:39 ` Stephen Boyd
2019-03-27 10:37 ` Kieran Bingham
2019-03-25 18:45 ` [PATCH 4/4] scripts/gdb: Add a timer list command Stephen Boyd
2019-03-26 8:39 ` [PATCH 0/4] gdb script for kconfig and timer list Kieran Bingham
2019-03-26 20:35 ` Stephen Boyd
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