linux-kernel - [PATCH v5 06/20] scripts/gdb: Add internal helper and convenience function to look up a module

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Message-Id: <5c1a7b110bb2be463e979528d67a0ff7f1d54096.1359463075.git.jan.kiszka@siemens.com>
Date:	Tue, 29 Jan 2013 13:37:49 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net,
	Andi Kleen <andi@...stfloor.org>,
	Tom Tromey <tromey@...hat.com>,
	Ben Widawsky <ben@...dawsk.net>, Borislav Petkov <bp@...en8.de>
Subject: [PATCH v5 06/20] scripts/gdb: Add internal helper and convenience function to look up a module

Add the internal helper get_module_by_name to obtain the module
structure corresponding to the given name. Also export this service as a
convenience function.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 scripts/gdb/module.py      |   30 ++++++++++++++++++++++++++++++
 scripts/gdb/vmlinux-gdb.py |    1 +
 2 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/scripts/gdb/module.py b/scripts/gdb/module.py
index 01b23df..e309c0a 100644
--- a/scripts/gdb/module.py
+++ b/scripts/gdb/module.py
@@ -26,3 +26,33 @@ def for_each_module(func, arg = None):
 		module = container_of(entry, module_ptr_type, "list")
 		func(module, arg)
 		entry = entry['next']
+
+def find_module_by_name(name):
+	def match_name(module, arg):
+		if module['name'].string() == arg['name']:
+			arg['module'] = module
+
+	arg = { 'name': name, 'module': None }
+	for_each_module(match_name, arg)
+
+	return arg['module']
+
+
+class LxModule(gdb.Function):
+	__doc__ = "Find module by name and return the module variable.\n" \
+		  "\n" \
+		  "$lx_module(MODULE): Given the name MODULE, iterate over all loaded modules of\n" \
+		  "the target and return that module variable which MODULE matches."
+
+	def __init__(self):
+		super(LxModule, self).__init__("lx_module")
+
+	def invoke(self, mod_name):
+		mod_name = mod_name.string()
+		module = find_module_by_name(mod_name)
+		if module:
+			return module.dereference()
+		else:
+			raise gdb.GdbError("Unable to find MODULE " + mod_name)
+
+LxModule()
diff --git a/scripts/gdb/vmlinux-gdb.py b/scripts/gdb/vmlinux-gdb.py
index 3553b7d..2a466a0 100644
--- a/scripts/gdb/vmlinux-gdb.py
+++ b/scripts/gdb/vmlinux-gdb.py
@@ -23,3 +23,4 @@ if gdb_version < "7.1":
 else:
 	import utils
 	import symbols
+	import module
-- 
1.7.3.4

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