1# Copyright (C) 2020-2023 Free Software Foundation, Inc. 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# A dummy stack unwinder used for testing the Python unwinders when we 17# have inline frames. This unwinder will never claim any frames, 18# instead, all it does it try to read all registers possible target 19# registers as part of the frame sniffing process.. 20 21import gdb 22from gdb.unwinder import Unwinder 23 24apb_global = None 25 26 27class dummy_unwinder(Unwinder): 28 """A dummy unwinder that looks at a bunch of registers as part of 29 the unwinding process.""" 30 31 class frame_id(object): 32 """Basic frame id.""" 33 34 def __init__(self, sp, pc): 35 """Create the frame id.""" 36 self.sp = sp 37 self.pc = pc 38 39 def __init__(self): 40 """Create the unwinder.""" 41 Unwinder.__init__(self, "dummy stack unwinder") 42 self.void_ptr_t = gdb.lookup_type("void").pointer() 43 self.regs = None 44 45 def get_regs(self, pending_frame): 46 """Return a list of register names that should be read. Only 47 gathers the list once, then caches the result.""" 48 if self.regs is not None: 49 return self.regs 50 51 # Collect the names of all registers to read. 52 self.regs = list(pending_frame.architecture().register_names()) 53 54 return self.regs 55 56 def __call__(self, pending_frame): 57 """Actually performs the unwind, or at least sniffs this frame 58 to see if the unwinder should claim it, which is never does.""" 59 try: 60 for r in self.get_regs(pending_frame): 61 v = pending_frame.read_register(r).cast(self.void_ptr_t) 62 except: 63 print("Dummy unwinder, exception") 64 raise 65 66 return None 67 68 69# Register the ComRV stack unwinder. 70gdb.unwinder.register_unwinder(None, dummy_unwinder(), True) 71 72print("Python script imported") 73