72 lines
2.2 KiB
Python
72 lines
2.2 KiB
Python
# Copyright (C) 2021-2022 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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import gdb
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from gdb.unwinder import Unwinder
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class FrameId(object):
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def __init__(self, sp, pc):
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self._sp = sp
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self._pc = pc
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@property
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def sp(self):
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return self._sp
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@property
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def pc(self):
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return self._pc
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class TestUnwinder(Unwinder):
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def __init__(self, use_descriptors):
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if use_descriptors:
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tag = "using descriptors"
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else:
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tag = "using strings"
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Unwinder.__init__(self, "break unwinding %s" % tag)
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self._use_descriptors = use_descriptors
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def __call__(self, pending_frame):
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pc_desc = pending_frame.architecture().registers().find("pc")
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pc = pending_frame.read_register(pc_desc)
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sp_desc = pending_frame.architecture().registers().find("sp")
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sp = pending_frame.read_register(sp_desc)
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block = gdb.block_for_pc(int(pc))
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if block is None:
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return None
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func = block.function
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if func is None:
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return None
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if str(func) != "bar":
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return None
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fid = FrameId(pc, sp)
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unwinder = pending_frame.create_unwind_info(fid)
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if self._use_descriptors:
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unwinder.add_saved_register(pc_desc, pc)
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unwinder.add_saved_register(sp_desc, sp)
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else:
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unwinder.add_saved_register("pc", pc)
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unwinder.add_saved_register("sp", sp)
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return unwinder
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gdb.unwinder.register_unwinder(None, TestUnwinder(True), True)
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gdb.unwinder.register_unwinder(None, TestUnwinder(False), True)
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