1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # Copyright (c) 2023 MediaTek Inc.
4 #
5 # Authors:
6 # Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
7 #
8
9 import gdb
10 from linux import utils, constants
11
12 if constants.LX_CONFIG_STACKDEPOT:
13 stack_record_type = utils.CachedType('struct stack_record')
14 DEPOT_STACK_ALIGN = 4
15
16 def help():
17 t = """Usage: lx-stack_depot_lookup [Hex handle value]
18 Example:
19 lx-stack_depot_lookup 0x00c80300\n"""
20 gdb.write("Unrecognized command\n")
21 raise gdb.GdbError(t)
22
23 def stack_depot_fetch(handle):
24 global DEPOT_STACK_ALIGN
25 global stack_record_type
26
27 stack_depot_disabled = gdb.parse_and_eval('stack_depot_disabled')
28
29 if stack_depot_disabled:
30 raise gdb.GdbError("stack_depot_disabled\n")
31
32 handle_parts_t = gdb.lookup_type("union handle_parts")
33 parts = handle.cast(handle_parts_t)
34 offset = parts['offset'] << DEPOT_STACK_ALIGN
35 pools_num = gdb.parse_and_eval('pools_num')
36
37 if handle == 0:
38 raise gdb.GdbError("handle is 0\n")
39
40 pool_index = parts['pool_index_plus_1'] - 1
41 if pool_index >= pools_num:
42 gdb.write("pool index %d out of bounds (%d) for stack id 0x%08x\n" % (parts['pool_index'], pools_num, handle))
43 return gdb.Value(0), 0
44
45 stack_pools = gdb.parse_and_eval('stack_pools')
46
47 try:
48 pool = stack_pools[pool_index]
49 stack = (pool + gdb.Value(offset).cast(utils.get_size_t_type())).cast(stack_record_type.get_type().pointer())
50 size = int(stack['size'].cast(utils.get_ulong_type()))
51 return stack['entries'], size
52 except Exception as e:
53 gdb.write("%s\n" % e)
54 return gdb.Value(0), 0
55
56 def stack_depot_print(handle):
57 if not constants.LX_CONFIG_STACKDEPOT:
58 raise gdb.GdbError("CONFIG_STACKDEPOT is not enabled")
59
60 entries, nr_entries = stack_depot_fetch(handle)
61 if nr_entries > 0:
62 for i in range(0, nr_entries):
63 try:
64 gdb.execute("x /i 0x%x" % (int(entries[i])))
65 except Exception as e:
66 gdb.write("%s\n" % e)
67
68 class StackDepotLookup(gdb.Command):
69 """Search backtrace by handle"""
70
71 def __init__(self):
72 if constants.LX_CONFIG_STACKDEPOT:
73 super(StackDepotLookup, self).__init__("lx-stack_depot_lookup", gdb.COMMAND_SUPPORT)
74
75 def invoke(self, args, from_tty):
76 if not constants.LX_CONFIG_STACKDEPOT:
77 raise gdb.GdbError('CONFIG_STACKDEPOT is not set')
78
79 argv = gdb.string_to_argv(args)
80 if len(argv) == 1:
81 handle = int(argv[0], 16)
82 stack_depot_print(gdb.Value(handle).cast(utils.get_uint_type()))
83 else:
84 help()
85
86 StackDepotLookup()
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