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e7165a2d7d
Provide iomem_resource and ioports_resource printers and command hooks It can be quite interesting to halt the kernel as it's booting and check to see this list as it is being populated. It should be useful in the event that a kernel is not booting, you can identify what memory resources have been registered Link: http://lkml.kernel.org/r/f0a6b9fa9c92af4d7ed2e7343ccc84150e9c6fc5.1462865983.git.jan.kiszka@siemens.com Signed-off-by: Kieran Bingham <kieran.bingham@linaro.org> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
98 lines
2.6 KiB
Python
98 lines
2.6 KiB
Python
#
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# gdb helper commands and functions for Linux kernel debugging
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#
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# Kernel proc information reader
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#
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# Copyright (c) 2016 Linaro Ltd
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#
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# Authors:
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# Kieran Bingham <kieran.bingham@linaro.org>
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#
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# This work is licensed under the terms of the GNU GPL version 2.
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#
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import gdb
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class LxCmdLine(gdb.Command):
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""" Report the Linux Commandline used in the current kernel.
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Equivalent to cat /proc/cmdline on a running target"""
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def __init__(self):
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super(LxCmdLine, self).__init__("lx-cmdline", gdb.COMMAND_DATA)
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def invoke(self, arg, from_tty):
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gdb.write(gdb.parse_and_eval("saved_command_line").string() + "\n")
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LxCmdLine()
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class LxVersion(gdb.Command):
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""" Report the Linux Version of the current kernel.
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Equivalent to cat /proc/version on a running target"""
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def __init__(self):
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super(LxVersion, self).__init__("lx-version", gdb.COMMAND_DATA)
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def invoke(self, arg, from_tty):
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# linux_banner should contain a newline
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gdb.write(gdb.parse_and_eval("linux_banner").string())
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LxVersion()
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# Resource Structure Printers
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# /proc/iomem
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# /proc/ioports
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def get_resources(resource, depth):
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while resource:
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yield resource, depth
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child = resource['child']
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if child:
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for res, deep in get_resources(child, depth + 1):
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yield res, deep
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resource = resource['sibling']
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def show_lx_resources(resource_str):
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resource = gdb.parse_and_eval(resource_str)
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width = 4 if resource['end'] < 0x10000 else 8
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# Iterate straight to the first child
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for res, depth in get_resources(resource['child'], 0):
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start = int(res['start'])
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end = int(res['end'])
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gdb.write(" " * depth * 2 +
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"{0:0{1}x}-".format(start, width) +
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"{0:0{1}x} : ".format(end, width) +
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res['name'].string() + "\n")
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class LxIOMem(gdb.Command):
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"""Identify the IO memory resource locations defined by the kernel
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Equivalent to cat /proc/iomem on a running target"""
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def __init__(self):
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super(LxIOMem, self).__init__("lx-iomem", gdb.COMMAND_DATA)
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def invoke(self, arg, from_tty):
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return show_lx_resources("iomem_resource")
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LxIOMem()
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class LxIOPorts(gdb.Command):
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"""Identify the IO port resource locations defined by the kernel
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Equivalent to cat /proc/ioports on a running target"""
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def __init__(self):
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super(LxIOPorts, self).__init__("lx-ioports", gdb.COMMAND_DATA)
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def invoke(self, arg, from_tty):
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return show_lx_resources("ioport_resource")
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LxIOPorts()
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