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# Copyright (C) 2021-2024 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# This dummy unwinder will break GDB's backtrce at the function called
# 'break_bt_here'.
import gdb
from gdb.unwinder import Unwinder
class FrameId(object):
def __init__(self, sp, pc):
self._sp = sp
self._pc = pc
@property
def sp(self):
return self._sp
@property
def pc(self):
return self._pc
class TestUnwinder(Unwinder):
def __init__(self):
Unwinder.__init__(self, "break unwinding")
def __call__(self, pending_frame):
pc_desc = pending_frame.architecture().registers().find("pc")
pc = pending_frame.read_register(pc_desc)
sp_desc = pending_frame.architecture().registers().find("sp")
sp = pending_frame.read_register(sp_desc)
block = gdb.block_for_pc(int(pc))
if block is None:
return None
func = block.function
if func is None:
return None
if str(func) != "break_bt_here":
return None
fid = FrameId(pc, sp)
return pending_frame.create_unwind_info(fid)
gdb.unwinder.register_unwinder(None, TestUnwinder(), True)
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