The patch titled
Subject: scripts/gdb/symbols: add specific ko module load command
has been added to the -mm mm-nonmm-unstable branch. Its filename is
scripts-gdb-symbols-add-specific-ko-module-load-command.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/scripts-gdb-symbols-add-specific-ko-module-load-command.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kuan-Ying Lee <Kuan-Ying.Lee@xxxxxxxxxxxx>
Subject: scripts/gdb/symbols: add specific ko module load command
Date: Tue, 8 Aug 2023 16:30:11 +0800
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@xxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20230808083020.22254-2-Kuan-Ying.Lee@xxxxxxxxxxxx
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@xxxxxxxxxxxx>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Cc: Chinwen Chang <chinwen.chang@xxxxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Qun-Wei Lin <qun-wei.lin@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/gdb/linux/symbols.py | 23 +++++++++++++++++++++--
1 file changed, 21 insertions(+), 2 deletions(-)
--- a/scripts/gdb/linux/symbols.py~scripts-gdb-symbols-add-specific-ko-module-load-command
+++ a/scripts/gdb/linux/symbols.py
@@ -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'):
_
Patches currently in -mm which might be from Kuan-Ying.Lee@xxxxxxxxxxxx are
scripts-gdb-fix-lx-lsmod-show-the-wrong-size.patch
scripts-gdb-symbols-add-specific-ko-module-load-command.patch
scripts-gdb-modules-add-get-module-text-support.patch
scripts-gdb-utils-add-common-type-usage.patch
scripts-gdb-aarch64-add-aarch64-page-operation-helper-commands-and-configs.patch
scripts-gdb-stackdepot-add-stackdepot-support.patch
scripts-gdb-page_owner-add-page-owner-support.patch
scripts-gdb-slab-add-slab-support.patch
scripts-gdb-vmalloc-add-vmallocinfo-support.patch
