gdb/testsuite/gdb.python/py-unwind-user-regs.py

   1 # Copyright (C) 2021-2023 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 import gdb
  17 from gdb.unwinder import Unwinder
  18
  19
  20 class FrameId(object):
  21     def __init__(self, sp, pc):
  22         self._sp = sp
  23         self._pc = pc
  24
  25     @property
  26     def sp(self):
  27         return self._sp
  28
  29     @property
  30     def pc(self):
  31         return self._pc
  32
  33
  34 class TestUnwinder(Unwinder):
  35     def __init__(self, use_descriptors):
  36         if use_descriptors:
  37             tag = "using descriptors"
  38         else:
  39             tag = "using strings"
  40
  41         Unwinder.__init__(self, "break unwinding %s" % tag)
  42         self._use_descriptors = use_descriptors
  43
  44     def __call__(self, pending_frame):
  45         pc_desc = pending_frame.architecture().registers().find("pc")
  46         pc = pending_frame.read_register(pc_desc)
  47
  48         sp_desc = pending_frame.architecture().registers().find("sp")
  49         sp = pending_frame.read_register(sp_desc)
  50
  51         block = gdb.block_for_pc(int(pc))
  52         if block is None:
  53             return None
  54         func = block.function
  55         if func is None:
  56             return None
  57         if str(func) != "bar":
  58             return None
  59
  60         fid = FrameId(pc, sp)
  61         unwinder = pending_frame.create_unwind_info(fid)
  62         if self._use_descriptors:
  63             unwinder.add_saved_register(pc_desc, pc)
  64             unwinder.add_saved_register(sp_desc, sp)
  65         else:
  66             unwinder.add_saved_register("pc", pc)
  67             unwinder.add_saved_register("sp", sp)
  68         return unwinder
  69
  70
  71 gdb.unwinder.register_unwinder(None, TestUnwinder(True), True)
  72 gdb.unwinder.register_unwinder(None, TestUnwinder(False), True)