271 lines
8.4 KiB
Python
Executable File
271 lines
8.4 KiB
Python
Executable File
#
|
|
# 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
|
|
from linux import constants
|
|
from linux import utils
|
|
from linux import tasks
|
|
from linux import lists
|
|
from struct import *
|
|
|
|
|
|
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("(char *)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()
|
|
|
|
|
|
# Mount namespace viewer
|
|
# /proc/mounts
|
|
|
|
def info_opts(lst, opt):
|
|
opts = ""
|
|
for key, string in lst.items():
|
|
if opt & key:
|
|
opts += string
|
|
return opts
|
|
|
|
|
|
FS_INFO = {constants.LX_MS_SYNCHRONOUS: ",sync",
|
|
constants.LX_MS_MANDLOCK: ",mand",
|
|
constants.LX_MS_DIRSYNC: ",dirsync",
|
|
constants.LX_MS_NOATIME: ",noatime",
|
|
constants.LX_MS_NODIRATIME: ",nodiratime"}
|
|
|
|
MNT_INFO = {constants.LX_MNT_NOSUID: ",nosuid",
|
|
constants.LX_MNT_NODEV: ",nodev",
|
|
constants.LX_MNT_NOEXEC: ",noexec",
|
|
constants.LX_MNT_NOATIME: ",noatime",
|
|
constants.LX_MNT_NODIRATIME: ",nodiratime",
|
|
constants.LX_MNT_RELATIME: ",relatime"}
|
|
|
|
mount_type = utils.CachedType("struct mount")
|
|
mount_ptr_type = mount_type.get_type().pointer()
|
|
|
|
|
|
class LxMounts(gdb.Command):
|
|
"""Report the VFS mounts of the current process namespace.
|
|
|
|
Equivalent to cat /proc/mounts on a running target
|
|
An integer value can be supplied to display the mount
|
|
values of that process namespace"""
|
|
|
|
def __init__(self):
|
|
super(LxMounts, self).__init__("lx-mounts", gdb.COMMAND_DATA)
|
|
|
|
# Equivalent to proc_namespace.c:show_vfsmnt
|
|
# However, that has the ability to call into s_op functions
|
|
# whereas we cannot and must make do with the information we can obtain.
|
|
def invoke(self, arg, from_tty):
|
|
argv = gdb.string_to_argv(arg)
|
|
if len(argv) >= 1:
|
|
try:
|
|
pid = int(argv[0])
|
|
except:
|
|
raise gdb.GdbError("Provide a PID as integer value")
|
|
else:
|
|
pid = 1
|
|
|
|
task = tasks.get_task_by_pid(pid)
|
|
if not task:
|
|
raise gdb.GdbError("Couldn't find a process with PID {}"
|
|
.format(pid))
|
|
|
|
namespace = task['nsproxy']['mnt_ns']
|
|
if not namespace:
|
|
raise gdb.GdbError("No namespace for current process")
|
|
|
|
for vfs in lists.list_for_each_entry(namespace['list'],
|
|
mount_ptr_type, "mnt_list"):
|
|
devname = vfs['mnt_devname'].string()
|
|
devname = devname if devname else "none"
|
|
|
|
pathname = ""
|
|
parent = vfs
|
|
while True:
|
|
mntpoint = parent['mnt_mountpoint']
|
|
pathname = utils.dentry_name(mntpoint) + pathname
|
|
if (parent == parent['mnt_parent']):
|
|
break
|
|
parent = parent['mnt_parent']
|
|
|
|
if (pathname == ""):
|
|
pathname = "/"
|
|
|
|
superblock = vfs['mnt']['mnt_sb']
|
|
fstype = superblock['s_type']['name'].string()
|
|
s_flags = int(superblock['s_flags'])
|
|
m_flags = int(vfs['mnt']['mnt_flags'])
|
|
rd = "ro" if (s_flags & constants.LX_MS_RDONLY) else "rw"
|
|
|
|
gdb.write(
|
|
"{} {} {} {}{}{} 0 0\n"
|
|
.format(devname,
|
|
pathname,
|
|
fstype,
|
|
rd,
|
|
info_opts(FS_INFO, s_flags),
|
|
info_opts(MNT_INFO, m_flags)))
|
|
|
|
LxMounts()
|
|
|
|
|
|
class LxFdtDump(gdb.Command):
|
|
"""Output Flattened Device Tree header and dump FDT blob to the filename
|
|
specified as the command argument. Equivalent to
|
|
'cat /proc/fdt > fdtdump.dtb' on a running target"""
|
|
|
|
def __init__(self):
|
|
super(LxFdtDump, self).__init__("lx-fdtdump", gdb.COMMAND_DATA,
|
|
gdb.COMPLETE_FILENAME)
|
|
|
|
def fdthdr_to_cpu(self, fdt_header):
|
|
|
|
fdt_header_be = ">IIIIIII"
|
|
fdt_header_le = "<IIIIIII"
|
|
|
|
if utils.get_target_endianness() == 1:
|
|
output_fmt = fdt_header_le
|
|
else:
|
|
output_fmt = fdt_header_be
|
|
|
|
return unpack(output_fmt, pack(fdt_header_be,
|
|
fdt_header['magic'],
|
|
fdt_header['totalsize'],
|
|
fdt_header['off_dt_struct'],
|
|
fdt_header['off_dt_strings'],
|
|
fdt_header['off_mem_rsvmap'],
|
|
fdt_header['version'],
|
|
fdt_header['last_comp_version']))
|
|
|
|
def invoke(self, arg, from_tty):
|
|
|
|
if not constants.LX_CONFIG_OF:
|
|
raise gdb.GdbError("Kernel not compiled with CONFIG_OF\n")
|
|
|
|
if len(arg) == 0:
|
|
filename = "fdtdump.dtb"
|
|
else:
|
|
filename = arg
|
|
|
|
py_fdt_header_ptr = gdb.parse_and_eval(
|
|
"(const struct fdt_header *) initial_boot_params")
|
|
py_fdt_header = py_fdt_header_ptr.dereference()
|
|
|
|
fdt_header = self.fdthdr_to_cpu(py_fdt_header)
|
|
|
|
if fdt_header[0] != constants.LX_OF_DT_HEADER:
|
|
raise gdb.GdbError("No flattened device tree magic found\n")
|
|
|
|
gdb.write("fdt_magic: 0x{:02X}\n".format(fdt_header[0]))
|
|
gdb.write("fdt_totalsize: 0x{:02X}\n".format(fdt_header[1]))
|
|
gdb.write("off_dt_struct: 0x{:02X}\n".format(fdt_header[2]))
|
|
gdb.write("off_dt_strings: 0x{:02X}\n".format(fdt_header[3]))
|
|
gdb.write("off_mem_rsvmap: 0x{:02X}\n".format(fdt_header[4]))
|
|
gdb.write("version: {}\n".format(fdt_header[5]))
|
|
gdb.write("last_comp_version: {}\n".format(fdt_header[6]))
|
|
|
|
inf = gdb.inferiors()[0]
|
|
fdt_buf = utils.read_memoryview(inf, py_fdt_header_ptr,
|
|
fdt_header[1]).tobytes()
|
|
|
|
try:
|
|
f = open(filename, 'wb')
|
|
except:
|
|
raise gdb.GdbError("Could not open file to dump fdt")
|
|
|
|
f.write(fdt_buf)
|
|
f.close()
|
|
|
|
gdb.write("Dumped fdt blob to " + filename + "\n")
|
|
|
|
LxFdtDump()
|