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11bc5fe4 | 1 | # Copyright (C) 2016-2020 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 unwinder never does any unwinding. It'll (pretend to) "sniff" | |
17 | # the frame and ultimately return None, indicating that actual unwinding | |
18 | # should be performed by some other unwinder. | |
19 | # | |
20 | # But, prior to returning None, it will attempt to obtain the value | |
21 | # associated with a symbol via a call to gdb.parse_and_eval(). In | |
22 | # the course of doing this evaluation, GDB will potentially access | |
23 | # some frames, leading to the possibility of a recursive invocation of | |
24 | # this unwinder. If that should happen, code contained herein detects | |
25 | # that and prints a message which will cause some of the associated | |
26 | # tests to FAIL. | |
27 | ||
28 | import gdb | |
29 | from gdb.unwinder import Unwinder | |
30 | ||
31 | class TestUnwinder(Unwinder): | |
32 | ||
33 | count = 0 | |
34 | ||
35 | @classmethod | |
36 | def reset_count (cls): | |
37 | cls.count = 0 | |
38 | ||
39 | @classmethod | |
40 | def inc_count (cls): | |
41 | cls.count += 1 | |
42 | ||
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43 | test = 'check_undefined_symbol' |
44 | ||
45 | @classmethod | |
46 | def set_test (cls, test) : | |
47 | cls.test = test | |
48 | ||
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49 | def __init__(self): |
50 | Unwinder.__init__(self, "test unwinder") | |
51 | self.recurse_level = 0 | |
52 | ||
53 | def __call__(self, pending_frame): | |
54 | ||
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55 | if self.recurse_level > 0: |
56 | gdb.write("TestUnwinder: Recursion detected - returning early.\n") | |
57 | return None | |
58 | ||
59 | self.recurse_level += 1 | |
60 | TestUnwinder.inc_count() | |
61 | ||
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62 | if TestUnwinder.test == 'check_user_reg_pc' : |
63 | ||
64 | pc = pending_frame.read_register('pc') | |
65 | pc_as_int = int(pc.cast(gdb.lookup_type('int'))) | |
66 | # gdb.write("In unwinder: pc=%x\n" % pc_as_int) | |
67 | ||
68 | elif TestUnwinder.test == 'check_pae_pc' : | |
69 | ||
70 | pc = gdb.parse_and_eval('$pc') | |
71 | pc_as_int = int(pc.cast(gdb.lookup_type('int'))) | |
72 | # gdb.write("In unwinder: pc=%x\n" % pc_as_int) | |
73 | ||
74 | elif TestUnwinder.test == 'check_undefined_symbol' : | |
75 | ||
76 | try: | |
77 | val = gdb.parse_and_eval("undefined_symbol") | |
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79 | except Exception as arg: |
80 | pass | |
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81 | |
82 | self.recurse_level -= 1 | |
83 | ||
84 | return None | |
85 | ||
86 | gdb.unwinder.register_unwinder(None, TestUnwinder(), True) | |
87 | gdb.write("Python script imported\n") |