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scripts/gdb: add 'lx-stack_depot_lookup' command.

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This command allows users to quickly retrieve a stacktrace using a handle
obtained from a memory coredump.

Example output:
(gdb) lx-stack_depot_lookup 0x00c80300
   0xffff8000807965b4 <kmem_cache_alloc_noprof+660>:    mov     x20, x0
   0xffff800081a077d8 <kmem_cache_oob_alloc+76>:        mov     x1, x0
   0xffff800081a079a0 <test_version_show+100>:  cbnz    w0, 0xffff800081a07968 <test_version_show+44>
   0xffff800082f4a3fc <kobj_attr_show+60>:      ldr     x19, [sp, #16]
   0xffff800080a0fb34 <sysfs_kf_seq_show+460>:  ldp     x3, x4, [sp, #96]
   0xffff800080a0a550 <kernfs_seq_show+296>:    ldp     x19, x20, [sp, #16]
   0xffff8000808e7b40 <seq_read_iter+836>:      mov     w5, w0
   0xffff800080a0b8ac <kernfs_fop_read_iter+804>:       mov     x23, x0
   0xffff800080914a48 <copy_splice_read+972>:   mov     x6, x0
   0xffff8000809151c4 <do_splice_read+348>:     ldr     x21, [sp, #32]

Link: https://lkml.kernel.org/r/20240723064902.124154-5-kuan-ying.lee@canonical.com
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kuan-Ying Lee 2024-07-23 14:49:00 +08:00 committed by Andrew Morton
parent 4b183f6139
commit 35249f68b5
1 changed files with 27 additions and 0 deletions
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27
scripts/gdb/linux/stackdepot.py
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@ -13,6 +13,13 @@ if constants.LX_CONFIG_STACKDEPOT:
stack_record_type = utils.CachedType('struct stack_record') stack_record_type = utils.CachedType('struct stack_record')
DEPOT_STACK_ALIGN = 4 DEPOT_STACK_ALIGN = 4
def help():
t = """Usage: lx-stack_depot_lookup [Hex handle value]
Example:
lx-stack_depot_lookup 0x00c80300\n"""
gdb.write("Unrecognized command\n")
raise gdb.GdbError(t)
def stack_depot_fetch(handle): def stack_depot_fetch(handle):
global DEPOT_STACK_ALIGN global DEPOT_STACK_ALIGN
global stack_record_type global stack_record_type
@ -57,3 +64,23 @@ def stack_depot_print(handle):
gdb.execute("x /i 0x%x" % (int(entries[i]))) gdb.execute("x /i 0x%x" % (int(entries[i])))
except Exception as e: except Exception as e:
gdb.write("%s\n" % e) gdb.write("%s\n" % e)
class StackDepotLookup(gdb.Command):
"""Search backtrace by handle"""
def __init__(self):
if constants.LX_CONFIG_STACKDEPOT:
super(StackDepotLookup, self).__init__("lx-stack_depot_lookup", gdb.COMMAND_SUPPORT)
def invoke(self, args, from_tty):
if not constants.LX_CONFIG_STACKDEPOT:
raise gdb.GdbError('CONFIG_STACKDEPOT is not set')
argv = gdb.string_to_argv(args)
if len(argv) == 1:
handle = int(argv[0], 16)
stack_depot_print(gdb.Value(handle).cast(utils.get_uint_type()))
else:
help()
StackDepotLookup()