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scripts/gdb/symbols: add specific ko module load command

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Patch series "Add GDB memory helper commands", v2.

I've created some GDB commands I think useful when I debug some memory
issues and kernel module issue.

For memory issue, we would like to get slabinfo, slabtrace, page_owner and
vmallocinfo to debug the memory issues.

For module issue, we would like to query kernel module name when we get a
module text address and load module symbol by specific path.

Patch 1-2:
 - Add kernel module related command.
Patch 3-5:
 - Prepares for the memory-related command.
Patch 6-8:
 - Add memory-related commands.


This patch (of 8):

Add lx-symbols <ko_path> command to support add specific
ko module.

Example output like below:
(gdb) lx-symbols mm/kasan/kasan_test.ko
loading @0xffff800002d30000: mm/kasan/kasan_test.ko

Link: https://lkml.kernel.org/r/20230808083020.22254-1-Kuan-Ying.Lee@mediatek.com
Link: https://lkml.kernel.org/r/20230808083020.22254-2-Kuan-Ying.Lee@mediatek.com
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Qun-Wei Lin <qun-wei.lin@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kuan-Ying Lee 2023-08-08 16:30:11 +08:00 committed by Andrew Morton
parent 8e7b7ffbd4
commit 11f956538c
1 changed files with 21 additions and 2 deletions
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23
scripts/gdb/linux/symbols.py
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@ -111,11 +111,12 @@ lx-symbols command."""
return "{textaddr} {sections}".format(
textaddr=textaddr, sections="".join(args))
def load_module_symbols(self, module):
def load_module_symbols(self, module, module_file=None):
module_name = module['name'].string()
module_addr = str(module['mem'][constants.LX_MOD_TEXT]['base']).split()[0]
module_file = self._get_module_file(module_name)
if not module_file:
module_file = self._get_module_file(module_name)
if not module_file and not self.module_files_updated:
self._update_module_files()
module_file = self._get_module_file(module_name)
@ -138,6 +139,19 @@ lx-symbols command."""
else:
gdb.write("no module object found for '{0}'\n".format(module_name))
def load_ko_symbols(self, mod_path):
self.loaded_modules = []
module_list = modules.module_list()
for module in module_list:
module_name = module['name'].string()
module_pattern = ".*/{0}\.ko(?:.debug)?$".format(
module_name.replace("_", r"[_\-]"))
if re.match(module_pattern, mod_path) and os.path.exists(mod_path):
self.load_module_symbols(module, mod_path)
return
raise gdb.GdbError("%s is not a valid .ko\n" % mod_path)
def load_all_symbols(self):
gdb.write("loading vmlinux\n")
@ -176,6 +190,11 @@ lx-symbols command."""
self.module_files = []
self.module_files_updated = False
argv = gdb.string_to_argv(arg)
if len(argv) == 1:
self.load_ko_symbols(argv[0])
return
self.load_all_symbols()
if hasattr(gdb, 'Breakpoint'):