11 files changed, 575 insertions, 10 deletions

diff --git a/scripts/gdb/linux/clk.py b/scripts/gdb/linux/clk.py
new file mode 100644
index 000000000000..061aecfa294e
--- /dev/null
+++ b/scripts/gdb/linux/clk.py
@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (c) NXP 2019
+
+import gdb
+import sys
+
+from linux import utils, lists, constants
+
+clk_core_type = utils.CachedType("struct clk_core")
+
+
+def clk_core_for_each_child(hlist_head):
+    return lists.hlist_for_each_entry(hlist_head,
+            clk_core_type.get_type().pointer(), "child_node")
+
+
+class LxClkSummary(gdb.Command):
+    """Print clk tree summary
+
+Output is a subset of /sys/kernel/debug/clk/clk_summary
+
+No calls are made during printing, instead a (c) if printed after values which
+are cached and potentially out of date"""
+
+    def __init__(self):
+        super(LxClkSummary, self).__init__("lx-clk-summary", gdb.COMMAND_DATA)
+
+    def show_subtree(self, clk, level):
+        gdb.write("%*s%-*s %7d %8d %8d %11lu%s\n" % (
+                level * 3 + 1, "",
+                30 - level * 3,
+                clk['name'].string(),
+                clk['enable_count'],
+                clk['prepare_count'],
+                clk['protect_count'],
+                clk['rate'],
+                '(c)' if clk['flags'] & constants.LX_CLK_GET_RATE_NOCACHE else '   '))
+
+        for child in clk_core_for_each_child(clk['children']):
+            self.show_subtree(child, level + 1)
+
+    def invoke(self, arg, from_tty):
+        gdb.write("                                 enable  prepare  protect               \n")
+        gdb.write("   clock                          count    count    count        rate   \n")
+        gdb.write("------------------------------------------------------------------------\n")
+        for clk in clk_core_for_each_child(gdb.parse_and_eval("clk_root_list")):
+            self.show_subtree(clk, 0)
+        for clk in clk_core_for_each_child(gdb.parse_and_eval("clk_orphan_list")):
+            self.show_subtree(clk, 0)
+
+
+LxClkSummary()
+
+
+class LxClkCoreLookup(gdb.Function):
+    """Find struct clk_core by name"""
+
+    def __init__(self):
+        super(LxClkCoreLookup, self).__init__("lx_clk_core_lookup")
+
+    def lookup_hlist(self, hlist_head, name):
+        for child in clk_core_for_each_child(hlist_head):
+            if child['name'].string() == name:
+                return child
+            result = self.lookup_hlist(child['children'], name)
+            if result:
+                return result
+
+    def invoke(self, name):
+        name = name.string()
+        return (self.lookup_hlist(gdb.parse_and_eval("clk_root_list"), name) or
+                self.lookup_hlist(gdb.parse_and_eval("clk_orphan_list"), name))
+
+
+LxClkCoreLookup()
diff --git a/scripts/gdb/linux/config.py b/scripts/gdb/linux/config.py
new file mode 100644
index 000000000000..90e1565b1967
--- /dev/null
+++ b/scripts/gdb/linux/config.py
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright 2019 Google LLC.
+
+import gdb
+import zlib
+
+from linux import utils
+
+
+class LxConfigDump(gdb.Command):
+    """Output kernel config to the filename specified as the command
+       argument. Equivalent to 'zcat /proc/config.gz > config.txt' on
+       a running target"""
+
+    def __init__(self):
+        super(LxConfigDump, self).__init__("lx-configdump", gdb.COMMAND_DATA,
+                                           gdb.COMPLETE_FILENAME)
+
+    def invoke(self, arg, from_tty):
+        if len(arg) == 0:
+            filename = "config.txt"
+        else:
+            filename = arg
+
+        try:
+            py_config_ptr = gdb.parse_and_eval("kernel_config_data + 8")
+            py_config_size = gdb.parse_and_eval(
+                    "sizeof(kernel_config_data) - 1 - 8 * 2")
+        except gdb.error as e:
+            raise gdb.GdbError("Can't find config, enable CONFIG_IKCONFIG?")
+
+        inf = gdb.inferiors()[0]
+        zconfig_buf = utils.read_memoryview(inf, py_config_ptr,
+                                            py_config_size).tobytes()
+
+        config_buf = zlib.decompress(zconfig_buf, 16)
+        with open(filename, 'wb') as f:
+            f.write(config_buf)
+
+        gdb.write("Dumped config to " + filename + "\n")
+
+
+LxConfigDump()
diff --git a/scripts/gdb/linux/constants.py.in b/scripts/gdb/linux/constants.py.in
index d3319a80788a..1d73083da6cb 100644
--- a/scripts/gdb/linux/constants.py.in
+++ b/scripts/gdb/linux/constants.py.in
@@ -12,9 +12,12 @@
  *
  */
 
+#include <linux/clk-provider.h>
 #include <linux/fs.h>
+#include <linux/hrtimer.h>
 #include <linux/mount.h>
 #include <linux/of_fdt.h>
+#include <linux/threads.h>
 
 /* We need to stringify expanded macros so that they can be parsed */
 
@@ -36,6 +39,9 @@
 
 import gdb
 
+/* linux/clk-provider.h */
+LX_GDBPARSED(CLK_GET_RATE_NOCACHE)
+
 /* linux/fs.h */
 LX_VALUE(SB_RDONLY)
 LX_VALUE(SB_SYNCHRONOUS)
@@ -44,6 +50,9 @@ LX_VALUE(SB_DIRSYNC)
 LX_VALUE(SB_NOATIME)
 LX_VALUE(SB_NODIRATIME)
 
+/* linux/htimer.h */
+LX_GDBPARSED(hrtimer_resolution)
+
 /* linux/mount.h */
 LX_VALUE(MNT_NOSUID)
 LX_VALUE(MNT_NODEV)
@@ -52,8 +61,16 @@ LX_VALUE(MNT_NOATIME)
 LX_VALUE(MNT_NODIRATIME)
 LX_VALUE(MNT_RELATIME)
 
+/* linux/threads.h */
+LX_VALUE(NR_CPUS)
+
 /* linux/of_fdt.h> */
 LX_VALUE(OF_DT_HEADER)
 
 /* Kernel Configs */
+LX_CONFIG(CONFIG_GENERIC_CLOCKEVENTS)
+LX_CONFIG(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)
+LX_CONFIG(CONFIG_HIGH_RES_TIMERS)
+LX_CONFIG(CONFIG_NR_CPUS)
 LX_CONFIG(CONFIG_OF)
+LX_CONFIG(CONFIG_TICK_ONESHOT)
diff --git a/scripts/gdb/linux/cpus.py b/scripts/gdb/linux/cpus.py
index ca11e8df31b6..008e62f3190d 100644
--- a/scripts/gdb/linux/cpus.py
+++ b/scripts/gdb/linux/cpus.py
@@ -135,6 +135,7 @@ and can help identify the state of hotplugged CPUs"""
         gdb.write("Online CPUs   : {}\n".format(list(each_online_cpu())))
         gdb.write("Active CPUs   : {}\n".format(list(each_active_cpu())))
 
+
 LxCpus()
 
 
diff --git a/scripts/gdb/linux/lists.py b/scripts/gdb/linux/lists.py
index 2f335fbd86fd..c487ddf09d38 100644
--- a/scripts/gdb/linux/lists.py
+++ b/scripts/gdb/linux/lists.py
@@ -16,13 +16,15 @@ import gdb
 from linux import utils
 
 list_head = utils.CachedType("struct list_head")
+hlist_head = utils.CachedType("struct hlist_head")
+hlist_node = utils.CachedType("struct hlist_node")
 
 
 def list_for_each(head):
     if head.type == list_head.get_type().pointer():
         head = head.dereference()
     elif head.type != list_head.get_type():
-        raise gdb.GdbError("Must be struct list_head not {}"
+        raise TypeError("Must be struct list_head not {}"
                            .format(head.type))
 
     node = head['next'].dereference()
@@ -33,9 +35,24 @@ def list_for_each(head):
 
 def list_for_each_entry(head, gdbtype, member):
     for node in list_for_each(head):
-        if node.type != list_head.get_type().pointer():
-            raise TypeError("Type {} found. Expected struct list_head *."
-                            .format(node.type))
+        yield utils.container_of(node, gdbtype, member)
+
+
+def hlist_for_each(head):
+    if head.type == hlist_head.get_type().pointer():
+        head = head.dereference()
+    elif head.type != hlist_head.get_type():
+        raise TypeError("Must be struct hlist_head not {}"
+                           .format(head.type))
+
+    node = head['first'].dereference()
+    while node.address:
+        yield node.address
+        node = node['next'].dereference()
+
+
+def hlist_for_each_entry(head, gdbtype, member):
+    for node in hlist_for_each(head):
         yield utils.container_of(node, gdbtype, member)
 
 
@@ -110,4 +127,5 @@ class LxListChk(gdb.Command):
             raise gdb.GdbError("lx-list-check takes one argument")
         list_check(gdb.parse_and_eval(argv[0]))
 
+
 LxListChk()
diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py
index 2f01a958eb22..6a56bba233a9 100644
--- a/scripts/gdb/linux/proc.py
+++ b/scripts/gdb/linux/proc.py
@@ -29,6 +29,7 @@ class LxCmdLine(gdb.Command):
     def invoke(self, arg, from_tty):
         gdb.write(gdb.parse_and_eval("saved_command_line").string() + "\n")
 
+
 LxCmdLine()
 
 
@@ -43,6 +44,7 @@ class LxVersion(gdb.Command):
         # linux_banner should contain a newline
         gdb.write(gdb.parse_and_eval("(char *)linux_banner").string())
 
+
 LxVersion()
 
 
@@ -86,6 +88,7 @@ Equivalent to cat /proc/iomem on a running target"""
     def invoke(self, arg, from_tty):
         return show_lx_resources("iomem_resource")
 
+
 LxIOMem()
 
 
@@ -100,6 +103,7 @@ Equivalent to cat /proc/ioports on a running target"""
     def invoke(self, arg, from_tty):
         return show_lx_resources("ioport_resource")
 
+
 LxIOPorts()
 
 
@@ -149,7 +153,7 @@ values of that process namespace"""
         if len(argv) >= 1:
             try:
                 pid = int(argv[0])
-            except:
+            except gdb.error:
                 raise gdb.GdbError("Provide a PID as integer value")
         else:
             pid = 1
@@ -195,6 +199,7 @@ values of that process namespace"""
                         info_opts(FS_INFO, s_flags),
                         info_opts(MNT_INFO, m_flags)))
 
+
 LxMounts()
 
 
@@ -259,7 +264,7 @@ class LxFdtDump(gdb.Command):
 
         try:
             f = open(filename, 'wb')
-        except:
+        except gdb.error:
             raise gdb.GdbError("Could not open file to dump fdt")
 
         f.write(fdt_buf)
@@ -267,4 +272,5 @@ class LxFdtDump(gdb.Command):
 
         gdb.write("Dumped fdt blob to " + filename + "\n")
 
+
 LxFdtDump()
diff --git a/scripts/gdb/linux/rbtree.py b/scripts/gdb/linux/rbtree.py
new file mode 100644
index 000000000000..39db889b874c
--- /dev/null
+++ b/scripts/gdb/linux/rbtree.py
@@ -0,0 +1,177 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright 2019 Google LLC.
+
+import gdb
+
+from linux import utils
+
+rb_root_type = utils.CachedType("struct rb_root")
+rb_node_type = utils.CachedType("struct rb_node")
+
+
+def rb_first(root):
+    if root.type == rb_root_type.get_type():
+        node = node.address.cast(rb_root_type.get_type().pointer())
+    elif root.type != rb_root_type.get_type().pointer():
+        raise gdb.GdbError("Must be struct rb_root not {}".format(root.type))
+
+    node = root['rb_node']
+    if node is 0:
+        return None
+
+    while node['rb_left']:
+        node = node['rb_left']
+
+    return node
+
+
+def rb_last(root):
+    if root.type == rb_root_type.get_type():
+        node = node.address.cast(rb_root_type.get_type().pointer())
+    elif root.type != rb_root_type.get_type().pointer():
+        raise gdb.GdbError("Must be struct rb_root not {}".format(root.type))
+
+    node = root['rb_node']
+    if node is 0:
+        return None
+
+    while node['rb_right']:
+        node = node['rb_right']
+
+    return node
+
+
+def rb_parent(node):
+    parent = gdb.Value(node['__rb_parent_color'] & ~3)
+    return parent.cast(rb_node_type.get_type().pointer())
+
+
+def rb_empty_node(node):
+    return node['__rb_parent_color'] == node.address
+
+
+def rb_next(node):
+    if node.type == rb_node_type.get_type():
+        node = node.address.cast(rb_node_type.get_type().pointer())
+    elif node.type != rb_node_type.get_type().pointer():
+        raise gdb.GdbError("Must be struct rb_node not {}".format(node.type))
+
+    if rb_empty_node(node):
+        return None
+
+    if node['rb_right']:
+        node = node['rb_right']
+        while node['rb_left']:
+            node = node['rb_left']
+        return node
+
+    parent = rb_parent(node)
+    while parent and node == parent['rb_right']:
+            node = parent
+            parent = rb_parent(node)
+
+    return parent
+
+
+def rb_prev(node):
+    if node.type == rb_node_type.get_type():
+        node = node.address.cast(rb_node_type.get_type().pointer())
+    elif node.type != rb_node_type.get_type().pointer():
+        raise gdb.GdbError("Must be struct rb_node not {}".format(node.type))
+
+    if rb_empty_node(node):
+        return None
+
+    if node['rb_left']:
+        node = node['rb_left']
+        while node['rb_right']:
+            node = node['rb_right']
+        return node.dereference()
+
+    parent = rb_parent(node)
+    while parent and node == parent['rb_left'].dereference():
+            node = parent
+            parent = rb_parent(node)
+
+    return parent
+
+
+class LxRbFirst(gdb.Function):
+    """Lookup and return a node from an RBTree
+
+$lx_rb_first(root): Return the node at the given index.
+If index is omitted, the root node is dereferenced and returned."""
+
+    def __init__(self):
+        super(LxRbFirst, self).__init__("lx_rb_first")
+
+    def invoke(self, root):
+        result = rb_first(root)
+        if result is None:
+            raise gdb.GdbError("No entry in tree")
+
+        return result
+
+
+LxRbFirst()
+
+
+class LxRbLast(gdb.Function):
+    """Lookup and return a node from an RBTree.
+
+$lx_rb_last(root): Return the node at the given index.
+If index is omitted, the root node is dereferenced and returned."""
+
+    def __init__(self):
+        super(LxRbLast, self).__init__("lx_rb_last")
+
+    def invoke(self, root):
+        result = rb_last(root)
+        if result is None:
+            raise gdb.GdbError("No entry in tree")
+
+        return result
+
+
+LxRbLast()
+
+
+class LxRbNext(gdb.Function):
+    """Lookup and return a node from an RBTree.
+
+$lx_rb_next(node): Return the node at the given index.
+If index is omitted, the root node is dereferenced and returned."""
+
+    def __init__(self):
+        super(LxRbNext, self).__init__("lx_rb_next")
+
+    def invoke(self, node):
+        result = rb_next(node)
+        if result is None:
+            raise gdb.GdbError("No entry in tree")
+
+        return result
+
+
+LxRbNext()
+
+
+class LxRbPrev(gdb.Function):
+    """Lookup and return a node from an RBTree.
+
+$lx_rb_prev(node): Return the node at the given index.
+If index is omitted, the root node is dereferenced and returned."""
+
+    def __init__(self):
+        super(LxRbPrev, self).__init__("lx_rb_prev")
+
+    def invoke(self, node):
+        result = rb_prev(node)
+        if result is None:
+            raise gdb.GdbError("No entry in tree")
+
+        return result
+
+
+LxRbPrev()
diff --git a/scripts/gdb/linux/symbols.py b/scripts/gdb/linux/symbols.py
index 004b0ac7fa72..2f5b95f09fa0 100644
--- a/scripts/gdb/linux/symbols.py
+++ b/scripts/gdb/linux/symbols.py
@@ -139,8 +139,12 @@ lx-symbols command."""
                 saved_states.append({'breakpoint': bp, 'enabled': bp.enabled})
 
         # drop all current symbols and reload vmlinux
+        orig_vmlinux = 'vmlinux'
+        for obj in gdb.objfiles():
+            if obj.filename.endswith('vmlinux'):
+                orig_vmlinux = obj.filename
         gdb.execute("symbol-file", to_string=True)
-        gdb.execute("symbol-file vmlinux")
+        gdb.execute("symbol-file {0}".format(orig_vmlinux))
 
         self.loaded_modules = []
         module_list = modules.module_list()
diff --git a/scripts/gdb/linux/tasks.py b/scripts/gdb/linux/tasks.py
index f6ab3ccf698f..0301dc1e0138 100644
--- a/scripts/gdb/linux/tasks.py
+++ b/scripts/gdb/linux/tasks.py
@@ -79,6 +79,7 @@ class LxPs(gdb.Command):
                 pid=task["pid"],
                 comm=task["comm"].string()))
 
+
 LxPs()
 
 
@@ -134,4 +135,5 @@ variable."""
         else:
             raise gdb.GdbError("No task of PID " + str(pid))
 
+
 LxThreadInfoByPidFunc()
diff --git a/scripts/gdb/linux/timerlist.py b/scripts/gdb/linux/timerlist.py
new file mode 100644
index 000000000000..071d0dd5a634
--- /dev/null
+++ b/scripts/gdb/linux/timerlist.py
@@ -0,0 +1,219 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright 2019 Google LLC.
+
+import binascii
+import gdb
+
+from linux import constants
+from linux import cpus
+from linux import rbtree
+from linux import utils
+
+timerqueue_node_type = utils.CachedType("struct timerqueue_node").get_type()
+hrtimer_type = utils.CachedType("struct hrtimer").get_type()
+
+
+def ktime_get():
+    """Returns the current time, but not very accurately
+
+    We can't read the hardware timer itself to add any nanoseconds
+    that need to be added since we last stored the time in the
+    timekeeper. But this is probably good enough for debug purposes."""
+    tk_core = gdb.parse_and_eval("&tk_core")
+
+    return tk_core['timekeeper']['tkr_mono']['base']
+
+
+def print_timer(rb_node, idx):
+    timerqueue = utils.container_of(rb_node, timerqueue_node_type.pointer(),
+                                    "node")
+    timer = utils.container_of(timerqueue, hrtimer_type.pointer(), "node")
+
+    function = str(timer['function']).split(" ")[1].strip("<>")
+    softexpires = timer['_softexpires']
+    expires = timer['node']['expires']
+    now = ktime_get()
+
+    text = " #{}: <{}>, {}, ".format(idx, timer, function)
+    text += "S:{:02x}\n".format(int(timer['state']))
+    text += " # expires at {}-{} nsecs [in {} to {} nsecs]\n".format(
+            softexpires, expires, softexpires - now, expires - now)
+    return text
+
+
+def print_active_timers(base):
+    curr = base['active']['next']['node']
+    curr = curr.address.cast(rbtree.rb_node_type.get_type().pointer())
+    idx = 0
+    while curr:
+        yield print_timer(curr, idx)
+        curr = rbtree.rb_next(curr)
+        idx += 1
+
+
+def print_base(base):
+    text = " .base:       {}\n".format(base.address)
+    text += " .index:      {}\n".format(base['index'])
+
+    text += " .resolution: {} nsecs\n".format(constants.LX_hrtimer_resolution)
+
+    text += " .get_time:   {}\n".format(base['get_time'])
+    if constants.LX_CONFIG_HIGH_RES_TIMERS:
+        text += "  .offset:     {} nsecs\n".format(base['offset'])
+    text += "active timers:\n"
+    text += "".join([x for x in print_active_timers(base)])
+    return text
+
+
+def print_cpu(hrtimer_bases, cpu, max_clock_bases):
+    cpu_base = cpus.per_cpu(hrtimer_bases, cpu)
+    jiffies = gdb.parse_and_eval("jiffies_64")
+    tick_sched_ptr = gdb.parse_and_eval("&tick_cpu_sched")
+    ts = cpus.per_cpu(tick_sched_ptr, cpu)
+
+    text = "cpu: {}\n".format(cpu)
+    for i in xrange(max_clock_bases):
+        text += " clock {}:\n".format(i)
+        text += print_base(cpu_base['clock_base'][i])
+
+        if constants.LX_CONFIG_HIGH_RES_TIMERS:
+            fmts = [("  .{}   : {} nsecs", 'expires_next'),
+                    ("  .{}    : {}", 'hres_active'),
+                    ("  .{}      : {}", 'nr_events'),
+                    ("  .{}     : {}", 'nr_retries'),
+                    ("  .{}       : {}", 'nr_hangs'),
+                    ("  .{}  : {}", 'max_hang_time')]
+            text += "\n".join([s.format(f, cpu_base[f]) for s, f in fmts])
+            text += "\n"
+
+        if constants.LX_CONFIG_TICK_ONESHOT:
+            fmts = [("  .{}      : {}", 'nohz_mode'),
+                    ("  .{}      : {} nsecs", 'last_tick'),
+                    ("  .{}   : {}", 'tick_stopped'),
+                    ("  .{}   : {}", 'idle_jiffies'),
+                    ("  .{}     : {}", 'idle_calls'),
+                    ("  .{}    : {}", 'idle_sleeps'),
+                    ("  .{} : {} nsecs", 'idle_entrytime'),
+                    ("  .{}  : {} nsecs", 'idle_waketime'),
+                    ("  .{}  : {} nsecs", 'idle_exittime'),
+                    ("  .{} : {} nsecs", 'idle_sleeptime'),
+                    ("  .{}: {} nsecs", 'iowait_sleeptime'),
+                    ("  .{}   : {}", 'last_jiffies'),
+                    ("  .{}     : {}", 'next_timer'),
+                    ("  .{}   : {} nsecs", 'idle_expires')]
+            text += "\n".join([s.format(f, ts[f]) for s, f in fmts])
+            text += "\njiffies: {}\n".format(jiffies)
+
+        text += "\n"
+
+    return text
+
+
+def print_tickdevice(td, cpu):
+    dev = td['evtdev']
+    text = "Tick Device: mode:     {}\n".format(td['mode'])
+    if cpu < 0:
+            text += "Broadcast device\n"
+    else:
+            text += "Per CPU device: {}\n".format(cpu)
+
+    text += "Clock Event Device: "
+    if dev == 0:
+            text += "<NULL>\n"
+            return text
+
+    text += "{}\n".format(dev['name'])
+    text += " max_delta_ns:   {}\n".format(dev['max_delta_ns'])
+    text += " min_delta_ns:   {}\n".format(dev['min_delta_ns'])
+    text += " mult:           {}\n".format(dev['mult'])
+    text += " shift:          {}\n".format(dev['shift'])
+    text += " mode:           {}\n".format(dev['state_use_accessors'])
+    text += " next_event:     {} nsecs\n".format(dev['next_event'])
+
+    text += " set_next_event: {}\n".format(dev['set_next_event'])
+
+    members = [('set_state_shutdown', " shutdown: {}\n"),
+               ('set_state_periodic', " periodic: {}\n"),
+               ('set_state_oneshot', " oneshot:  {}\n"),
+               ('set_state_oneshot_stopped', " oneshot stopped: {}\n"),
+               ('tick_resume', " resume:   {}\n")]
+    for member, fmt in members:
+        if dev[member]:
+            text += fmt.format(dev[member])
+
+    text += " event_handler:  {}\n".format(dev['event_handler'])
+    text += " retries:        {}\n".format(dev['retries'])
+
+    return text
+
+
+def pr_cpumask(mask):
+    nr_cpu_ids = 1
+    if constants.LX_NR_CPUS > 1:
+        nr_cpu_ids = gdb.parse_and_eval("nr_cpu_ids")
+
+    inf = gdb.inferiors()[0]
+    bits = mask['bits']
+    num_bytes = (nr_cpu_ids + 7) / 8
+    buf = utils.read_memoryview(inf, bits, num_bytes).tobytes()
+    buf = binascii.b2a_hex(buf)
+
+    chunks = []
+    i = num_bytes
+    while i > 0:
+        i -= 1
+        start = i * 2
+        end = start + 2
+        chunks.append(buf[start:end])
+        if i != 0 and i % 4 == 0:
+            chunks.append(',')
+
+    extra = nr_cpu_ids % 8
+    if 0 < extra <= 4:
+        chunks[0] = chunks[0][0]  # Cut off the first 0
+
+    return "".join(chunks)
+
+
+class LxTimerList(gdb.Command):
+    """Print /proc/timer_list"""
+
+    def __init__(self):
+        super(LxTimerList, self).__init__("lx-timerlist", gdb.COMMAND_DATA)
+
+    def invoke(self, arg, from_tty):
+        hrtimer_bases = gdb.parse_and_eval("&hrtimer_bases")
+        max_clock_bases = gdb.parse_and_eval("HRTIMER_MAX_CLOCK_BASES")
+
+        text = "Timer List Version: gdb scripts\n"
+        text += "HRTIMER_MAX_CLOCK_BASES: {}\n".format(max_clock_bases)
+        text += "now at {} nsecs\n".format(ktime_get())
+
+        for cpu in cpus.each_online_cpu():
+            text += print_cpu(hrtimer_bases, cpu, max_clock_bases)
+
+        if constants.LX_CONFIG_GENERIC_CLOCKEVENTS:
+            if constants.LX_CONFIG_GENERIC_CLOCKEVENTS_BROADCAST:
+                bc_dev = gdb.parse_and_eval("&tick_broadcast_device")
+                text += print_tickdevice(bc_dev, -1)
+                text += "\n"
+                mask = gdb.parse_and_eval("tick_broadcast_mask")
+                mask = pr_cpumask(mask)
+                text += "tick_broadcast_mask: {}\n".format(mask)
+                if constants.LX_CONFIG_TICK_ONESHOT:
+                    mask = gdb.parse_and_eval("tick_broadcast_oneshot_mask")
+                    mask = pr_cpumask(mask)
+                    text += "tick_broadcast_oneshot_mask: {}\n".format(mask)
+                text += "\n"
+
+            tick_cpu_devices = gdb.parse_and_eval("&tick_cpu_device")
+            for cpu in cpus.each_online_cpu():
+                tick_dev = cpus.per_cpu(tick_cpu_devices, cpu)
+                text += print_tickdevice(tick_dev, cpu)
+                text += "\n"
+
+        gdb.write(text)
+
+
+LxTimerList()
diff --git a/scripts/gdb/linux/utils.py b/scripts/gdb/linux/utils.py
index 50805874cfc3..bc67126118c4 100644
--- a/scripts/gdb/linux/utils.py
+++ b/scripts/gdb/linux/utils.py
@@ -66,6 +66,7 @@ Note that TYPE and ELEMENT have to be quoted as strings."""
         return container_of(ptr, gdb.lookup_type(typename.string()).pointer(),
                             elementname.string())
 
+
 ContainerOf()
 
 
@@ -148,14 +149,14 @@ def get_gdbserver_type():
     def probe_qemu():
         try:
             return gdb.execute("monitor info version", to_string=True) != ""
-        except:
+        except gdb.error:
             return False
 
     def probe_kgdb():
         try:
             thread_info = gdb.execute("info thread 2", to_string=True)
             return "shadowCPU0" in thread_info
-        except:
+        except gdb.error:
             return False
 
     global gdbserver_type
@@ -172,7 +173,7 @@ def get_gdbserver_type():
 def gdb_eval_or_none(expresssion):
     try:
         return gdb.parse_and_eval(expresssion)
-    except:
+    except gdb.error:
         return None