+ scripts-gdb-modules-add-get-module-text-support.patch added to mm-nonmm-unstable branch

* + scripts-gdb-modules-add-get-module-text-support.patch added to mm-nonmm-unstable branch
@ 2023-07-25 18:39 Andrew Morton
  0 siblings, 0 replies; 2+ messages in thread
From: Andrew Morton @ 2023-07-25 18:39 UTC (permalink / raw)
  To: mm-commits, qun-wei.lin, matthias.bgg, chinwen.chang,
	angelogioacchino.delregno, Kuan-Ying.Lee, akpm


The patch titled
     Subject: scripts/gdb/modules: add get module text support
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     scripts-gdb-modules-add-get-module-text-support.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/scripts-gdb-modules-add-get-module-text-support.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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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Subject: scripts/gdb/modules: add get module text support
Date: Tue, 25 Jul 2023 17:34:52 +0800

When we get an text address from coredump and we cannot find
this address in vmlinux, it might located in kernel module.

We want to know which kernel module it located in.

This GDB scripts can help us to find the target kernel module.

(gdb) lx-getmod-by-textaddr 0xffff800002d305ac
0xffff800002d305ac is in kasan_test.ko

Link: https://lkml.kernel.org/r/20230725093458.30064-3-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>
---

 scripts/gdb/linux/modules.py |   32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

--- a/scripts/gdb/linux/modules.py~scripts-gdb-modules-add-get-module-text-support
+++ a/scripts/gdb/linux/modules.py
@@ -91,5 +91,35 @@ class LxLsmod(gdb.Command):
 
             gdb.write("\n")
 
-
 LxLsmod()
+
+def help():
+    t = """Usage: lx-getmod-by-textaddr [Heximal Address]
+    Example: lx-getmod-by-textaddr 0xffff800002d305ac\n"""
+    gdb.write("Unrecognized command\n")
+    raise gdb.GdbError(t)
+
+class LxFindTextAddrinMod(gdb.Command):
+    '''Look up loaded kernel module by text address.'''
+
+    def __init__(self):
+        super(LxFindTextAddrinMod, self).__init__('lx-getmod-by-textaddr', gdb.COMMAND_SUPPORT)
+
+    def invoke(self, arg, from_tty):
+        args = gdb.string_to_argv(arg)
+
+        if len(args) != 1:
+            help()
+
+        addr = gdb.Value(int(args[0], 16)).cast(utils.get_ulong_type())
+        for mod in module_list():
+            mod_text_start = mod['mem'][constants.LX_MOD_TEXT]['base']
+            mod_text_end = mod_text_start + mod['mem'][constants.LX_MOD_TEXT]['size'].cast(utils.get_ulong_type())
+
+            if addr >= mod_text_start and addr < mod_text_end:
+                s = "0x%x" % addr + " is in " + mod['name'].string() + ".ko\n"
+                gdb.write(s)
+                return
+        gdb.write("0x%x is not in any module text section\n" % addr)
+
+LxFindTextAddrinMod()
_

Patches currently in -mm which might be from Kuan-Ying.Lee@mediatek.com are

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


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