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4a94e368 | 1 | # Copyright (C) 2021-2022 Free Software Foundation, Inc. |
275ee935 AB |
2 | |
3 | # This program is free software; you can redistribute it and/or modify | |
4 | # it under the terms of the GNU General Public License as published by | |
5 | # the Free Software Foundation; either version 3 of the License, or | |
6 | # (at your option) any later version. | |
7 | # | |
8 | # This program is distributed in the hope that it will be useful, | |
9 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | # GNU General Public License for more details. | |
12 | # | |
13 | # You should have received a copy of the GNU General Public License | |
14 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | ||
16 | import gdb | |
17 | from gdb.unwinder import Unwinder | |
18 | ||
19 | # Set this to the stack level the backtrace should be corrupted at. | |
20 | # This will only work for frame 1, 3, or 5 in the test this unwinder | |
21 | # was written for. | |
22 | stop_at_level = None | |
23 | ||
24 | # Set this to the stack frame size of frames 1, 3, and 5. These | |
25 | # frames will all have the same stack frame size as they are the same | |
26 | # function called recursively. | |
27 | stack_adjust = None | |
28 | ||
29 | ||
30 | class FrameId(object): | |
31 | def __init__(self, sp, pc): | |
32 | self._sp = sp | |
33 | self._pc = pc | |
34 | ||
35 | @property | |
36 | def sp(self): | |
37 | return self._sp | |
38 | ||
39 | @property | |
40 | def pc(self): | |
41 | return self._pc | |
42 | ||
43 | ||
44 | class TestUnwinder(Unwinder): | |
45 | def __init__(self): | |
46 | Unwinder.__init__(self, "stop at level") | |
47 | ||
48 | def __call__(self, pending_frame): | |
49 | global stop_at_level | |
50 | global stack_adjust | |
51 | ||
52 | if stop_at_level is None or pending_frame.level() != stop_at_level: | |
53 | return None | |
54 | ||
55 | if stack_adjust is None: | |
56 | raise gdb.GdbError("invalid stack_adjust") | |
57 | ||
58 | if not stop_at_level in [1, 3, 5]: | |
59 | raise gdb.GdbError("invalid stop_at_level") | |
60 | ||
61 | sp_desc = pending_frame.architecture().registers().find("sp") | |
62 | sp = pending_frame.read_register(sp_desc) + stack_adjust | |
63 | pc = (gdb.lookup_symbol("normal_func"))[0].value().address | |
64 | unwinder = pending_frame.create_unwind_info(FrameId(sp, pc)) | |
65 | ||
66 | for reg in pending_frame.architecture().registers("general"): | |
67 | val = pending_frame.read_register(reg) | |
68 | unwinder.add_saved_register(reg, val) | |
69 | return unwinder | |
70 | ||
71 | ||
72 | gdb.unwinder.register_unwinder(None, TestUnwinder(), True) | |
73 | ||
74 | # When loaded, it is expected that the stack looks like: | |
75 | # | |
76 | # main -> normal_func -> inline_func -> normal_func -> inline_func -> normal_func -> inline_func | |
77 | # | |
78 | # Compute the stack frame size of normal_func, which has inline_func | |
79 | # inlined within it. | |
80 | f0 = gdb.newest_frame() | |
81 | f1 = f0.older() | |
82 | f2 = f1.older() | |
83 | f0_sp = f0.read_register("sp") | |
84 | f2_sp = f2.read_register("sp") | |
85 | stack_adjust = f2_sp - f0_sp |