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#
# gdb helper commands and functions for Linux kernel debugging
#
# Kernel proc information reader
#
# Copyright (c) 2016 Linaro Ltd
#
# Authors:
# Kieran Bingham <kieran.bingham@linaro.org>
#
# This work is licensed under the terms of the GNU GPL version 2.
#
import gdb
class LxCmdLine(gdb.Command):
""" Report the Linux Commandline used in the current kernel.
Equivalent to cat /proc/cmdline on a running target"""
def __init__(self):
super(LxCmdLine, self).__init__("lx-cmdline", gdb.COMMAND_DATA)
def invoke(self, arg, from_tty):
gdb.write(gdb.parse_and_eval("saved_command_line").string() + "\n")
LxCmdLine()
class LxVersion(gdb.Command):
""" Report the Linux Version of the current kernel.
Equivalent to cat /proc/version on a running target"""
def __init__(self):
super(LxVersion, self).__init__("lx-version", gdb.COMMAND_DATA)
def invoke(self, arg, from_tty):
# linux_banner should contain a newline
gdb.write(gdb.parse_and_eval("linux_banner").string())
LxVersion()
# Resource Structure Printers
# /proc/iomem
# /proc/ioports
def get_resources(resource, depth):
while resource:
yield resource, depth
child = resource['child']
if child:
for res, deep in get_resources(child, depth + 1):
yield res, deep
resource = resource['sibling']
def show_lx_resources(resource_str):
resource = gdb.parse_and_eval(resource_str)
width = 4 if resource['end'] < 0x10000 else 8
# Iterate straight to the first child
for res, depth in get_resources(resource['child'], 0):
start = int(res['start'])
end = int(res['end'])
gdb.write(" " * depth * 2 +
"{0:0{1}x}-".format(start, width) +
"{0:0{1}x} : ".format(end, width) +
res['name'].string() + "\n")
class LxIOMem(gdb.Command):
"""Identify the IO memory resource locations defined by the kernel
Equivalent to cat /proc/iomem on a running target"""
def __init__(self):
super(LxIOMem, self).__init__("lx-iomem", gdb.COMMAND_DATA)
def invoke(self, arg, from_tty):
return show_lx_resources("iomem_resource")
LxIOMem()
class LxIOPorts(gdb.Command):
"""Identify the IO port resource locations defined by the kernel
Equivalent to cat /proc/ioports on a running target"""
def __init__(self):
super(LxIOPorts, self).__init__("lx-ioports", gdb.COMMAND_DATA)
def invoke(self, arg, from_tty):
return show_lx_resources("ioport_resource")
LxIOPorts()
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