forked from mirrors/linux
90cf83dbd2
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. [swboyd@chromium.org: v2] Link: http://lkml.kernel.org/r/20190329220844.38234-3-swboyd@chromium.org Link: http://lkml.kernel.org/r/20190325184522.260535-3-swboyd@chromium.org Signed-off-by: Stephen Boyd <swboyd@chromium.org> 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> Cc: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
44 lines
1.3 KiB
Python
44 lines
1.3 KiB
Python
# SPDX-License-Identifier: GPL-2.0
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#
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# Copyright 2019 Google LLC.
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import gdb
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import zlib
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from linux import utils
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class LxConfigDump(gdb.Command):
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"""Output kernel config to the filename specified as the command
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argument. Equivalent to 'zcat /proc/config.gz > config.txt' on
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a running target"""
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def __init__(self):
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super(LxConfigDump, self).__init__("lx-configdump", gdb.COMMAND_DATA,
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gdb.COMPLETE_FILENAME)
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def invoke(self, arg, from_tty):
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if len(arg) == 0:
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filename = "config.txt"
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else:
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filename = arg
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try:
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py_config_ptr = gdb.parse_and_eval("kernel_config_data + 8")
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py_config_size = gdb.parse_and_eval(
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"sizeof(kernel_config_data) - 1 - 8 * 2")
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except gdb.error as e:
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raise gdb.GdbError("Can't find config, enable CONFIG_IKCONFIG?")
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inf = gdb.inferiors()[0]
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zconfig_buf = utils.read_memoryview(inf, py_config_ptr,
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py_config_size).tobytes()
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config_buf = zlib.decompress(zconfig_buf, 16)
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with open(filename, 'wb') as f:
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f.write(config_buf)
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gdb.write("Dumped config to " + filename + "\n")
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LxConfigDump()
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