From: Jan Kiszka <jan.kis...@siemens.com>
This is probably the most useful helper when debugging kernel modules:
lx-symbols will first reload vmlinux. Then it searches recursively for
*.ko files in the specified paths and the current directory. Finally it
walks the kernel's module list, issuing the necessary add-symbol-file
command for each loaded module so that gdb know which module symbol
correspond to which address.
Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
scripts/gdb/symbols.py | 88 ++++++++++++++++++++++++++++++++++++++++++++
scripts/gdb/vmlinux-gdb.py | 1 +
2 files changed, 89 insertions(+), 0 deletions(-)
create mode 100644 scripts/gdb/symbols.py
diff --git a/scripts/gdb/symbols.py b/scripts/gdb/symbols.py
new file mode 100644
index 0000000..dd13b0d
--- /dev/null
+++ b/scripts/gdb/symbols.py
@@ -0,0 +1,88 @@
+#
+# gdb helper commands and functions for Linux kernel debugging
+#
+# load kernel and module symbols
+#
+# Copyright (c) 2011, 2012 Siemens AG
+#
+# Authors:
+# Jan Kiszka <jan.kis...@siemens.com>
+#
+# This work is licensed under the terms of the GNU GPL version 2.
+#
+
+import gdb
+import os
+import re
+import string
+
+from utils import *
+
+class LinuxSymbols(gdb.Command):
+ __doc__ = "(Re-)load symbols of Linux kernel and currently loaded
modules.\n" \
+ "\n" \
+ "The kernel (vmlinux) is taken from the current working
directly. Modules (.ko)\n" \
+ "are scanned recursively, starting in the same directory.
Optionally, the module\n" \
+ "search path can be extended by a space separated list of
paths passed to the\n" \
+ "lx-symbols command."
+
+ def __init__(self):
+ super(LinuxSymbols, self).__init__("lx-symbols",
+ gdb.COMMAND_FILES,
+ gdb.COMPLETE_FILENAME)
+
+ def invoke(self, arg, from_tty):
+ print "loading vmlinux"
+ gdb.execute("symbol-file vmlinux")
+
+ modules = gdb.parse_and_eval("modules")
+ entry = modules['next']
+ if entry == modules.address:
+ print "no modules found"
+ return
+
+ module_files = []
+ paths = arg.split()
+ paths.append(os.getcwd())
+ for path in paths:
+ print "scanning for modules in " + path
+ for root, dirs, files in os.walk(path):
+ for name in files:
+ if re.match(r".*\.ko$", name):
+ module_files.append(root + \
+ "/" + name)
+
+ module_type = gdb.lookup_type("struct module").pointer()
+
+ while entry != modules.address:
+ module = container_of(entry, module_type, "list")
+ module_name = module['name'].string()
+ module_addr = str(module['module_core'])
+ module_pattern = ".*/" + \
+ string.replace(module_name, "_", r"[_\-]") + \
+ r"\.ko$"
+ module_path = ""
+ for name in module_files:
+ if re.match(module_pattern, name):
+ module_path = name
+ break
+
+ if module_path:
+ print "loading @" + module_addr + ": " + \
+ module_path
+ if gdb.VERSION >= "7.2":
+ gdb.execute("add-symbol-file " + \
+ module_path + " " + \
+ module_addr,
+ to_string = True)
+ else:
+ gdb.execute("add-symbol-file " + \
+ module_path + " " + \
+ module_addr)
+ else:
+ print "no module object found for '" + \
+ module_name + "'"
+
+ entry = entry['next']
+
+LinuxSymbols()
diff --git a/scripts/gdb/vmlinux-gdb.py b/scripts/gdb/vmlinux-gdb.py
index 62c30b8..fa1d5e1 100644
--- a/scripts/gdb/vmlinux-gdb.py
+++ b/scripts/gdb/vmlinux-gdb.py
@@ -20,3 +20,4 @@ if not gdb.VERSION >= "7.1":
"to work."
else:
import utils
+ import symbols
--
1.7.3.4
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