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88b9d363 | 1 | # Copyright (C) 2021-2022 Free Software Foundation, Inc. |
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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 | # This dummy unwinder will break GDB's backtrce at the function called | |
17 | # 'break_bt_here'. | |
18 | ||
19 | import gdb | |
20 | from gdb.unwinder import Unwinder | |
21 | ||
22 | ||
23 | class FrameId(object): | |
24 | def __init__(self, sp, pc): | |
25 | self._sp = sp | |
26 | self._pc = pc | |
27 | ||
28 | @property | |
29 | def sp(self): | |
30 | return self._sp | |
31 | ||
32 | @property | |
33 | def pc(self): | |
34 | return self._pc | |
35 | ||
36 | ||
37 | class TestUnwinder(Unwinder): | |
38 | def __init__(self): | |
39 | Unwinder.__init__(self, "break unwinding") | |
40 | ||
41 | def __call__(self, pending_frame): | |
42 | pc_desc = pending_frame.architecture().registers().find("pc") | |
43 | pc = pending_frame.read_register(pc_desc) | |
44 | ||
45 | sp_desc = pending_frame.architecture().registers().find("sp") | |
46 | sp = pending_frame.read_register(sp_desc) | |
47 | ||
48 | block = gdb.block_for_pc(int(pc)) | |
f9e59d06 | 49 | if block is None: |
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50 | return None |
51 | func = block.function | |
f9e59d06 | 52 | if func is None: |
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53 | return None |
54 | if str(func) != "break_bt_here": | |
55 | return None | |
56 | fid = FrameId(pc, sp) | |
57 | return pending_frame.create_unwind_info(fid) | |
58 | ||
59 | ||
60 | gdb.unwinder.register_unwinder(None, TestUnwinder(), True) |