From e7165a2d7d87cd397d166ebf4d49763d28f5fc3d Mon Sep 17 00:00:00 2001
From: Kieran Bingham <kieran.bingham@linaro.org>
Date: Mon, 23 May 2016 16:24:56 -0700
Subject: scripts/gdb: add io resource readers
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>
---
scripts/gdb/linux/proc.py | 57 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)
(limited to 'scripts/gdb/linux/proc.py')
diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py
index 6e6709c1830c..d855b2fd9a06 100644
--- a/scripts/gdb/linux/proc.py
+++ b/scripts/gdb/linux/proc.py
@@ -39,3 +39,60 @@ class LxVersion(gdb.Command):
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()
--
cgit
From c1a153992ea86307d2b8c3c0be2e060102b02aff Mon Sep 17 00:00:00 2001
From: Kieran Bingham <kieran.bingham@linaro.org>
Date: Mon, 23 May 2016 16:24:59 -0700
Subject: scripts/gdb: add mount point list command
lx-mounts will identify current mount points based on the 'init_task'
namespace by default, as we do not yet have a kernel thread list
implementation to select the current running thread.
Optionally, a user can specify a PID to list from that process'
namespace
Link: http://lkml.kernel.org/r/e614c7bc32d2350b4ff1627ec761a7148e65bfe6.1462865983.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>
---
scripts/gdb/linux/proc.py | 99 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 99 insertions(+)
(limited to 'scripts/gdb/linux/proc.py')
diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py
index d855b2fd9a06..38b1f09d1cd9 100644
--- a/scripts/gdb/linux/proc.py
+++ b/scripts/gdb/linux/proc.py
@@ -12,6 +12,10 @@
#
import gdb
+from linux import constants
+from linux import utils
+from linux import tasks
+from linux import lists
class LxCmdLine(gdb.Command):
@@ -96,3 +100,98 @@ Equivalent to cat /proc/ioports on a running target"""
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()
--
cgit