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https://sourceware.org/git/binutils-gdb.git
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88 lines
2.7 KiB
Python
88 lines
2.7 KiB
Python
# Copyright (C) 2016-2020 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# This unwinder never does any unwinding. It'll (pretend to) "sniff"
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# the frame and ultimately return None, indicating that actual unwinding
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# should be performed by some other unwinder.
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#
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# But, prior to returning None, it will attempt to obtain the value
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# associated with a symbol via a call to gdb.parse_and_eval(). In
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# the course of doing this evaluation, GDB will potentially access
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# some frames, leading to the possibility of a recursive invocation of
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# this unwinder. If that should happen, code contained herein detects
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# that and prints a message which will cause some of the associated
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# tests to FAIL.
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import gdb
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from gdb.unwinder import Unwinder
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class TestUnwinder(Unwinder):
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count = 0
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@classmethod
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def reset_count (cls):
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cls.count = 0
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@classmethod
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def inc_count (cls):
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cls.count += 1
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test = 'check_undefined_symbol'
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@classmethod
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def set_test (cls, test) :
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cls.test = test
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def __init__(self):
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Unwinder.__init__(self, "test unwinder")
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self.recurse_level = 0
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def __call__(self, pending_frame):
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if self.recurse_level > 0:
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gdb.write("TestUnwinder: Recursion detected - returning early.\n")
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return None
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self.recurse_level += 1
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TestUnwinder.inc_count()
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if TestUnwinder.test == 'check_user_reg_pc' :
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pc = pending_frame.read_register('pc')
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pc_as_int = int(pc.cast(gdb.lookup_type('int')))
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# gdb.write("In unwinder: pc=%x\n" % pc_as_int)
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elif TestUnwinder.test == 'check_pae_pc' :
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pc = gdb.parse_and_eval('$pc')
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pc_as_int = int(pc.cast(gdb.lookup_type('int')))
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# gdb.write("In unwinder: pc=%x\n" % pc_as_int)
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elif TestUnwinder.test == 'check_undefined_symbol' :
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try:
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val = gdb.parse_and_eval("undefined_symbol")
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except Exception as arg:
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pass
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self.recurse_level -= 1
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return None
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gdb.unwinder.register_unwinder(None, TestUnwinder(), True)
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gdb.write("Python script imported\n")
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