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# Copyright (C) 2020 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/>.
# A dummy stack unwinder used for testing the Python unwinders when we
# have inline frames. This unwinder will never claim any frames,
# instead, all it does it try to read all registers possible target
# registers as part of the frame sniffing process..
import gdb
from gdb.unwinder import Unwinder
apb_global = None
class dummy_unwinder (Unwinder):
""" A dummy unwinder that looks at a bunch of registers as part of
the unwinding process."""
class frame_id (object):
""" Basic frame id."""
def __init__ (self, sp, pc):
""" Create the frame id."""
self.sp = sp
self.pc = pc
def __init__ (self):
"""Create the unwinder."""
Unwinder.__init__ (self, "dummy stack unwinder")
self.void_ptr_t = gdb.lookup_type("void").pointer()
self.regs = None
def get_regs (self, pending_frame):
"""Return a list of register names that should be read. Only
gathers the list once, then caches the result."""
if (self.regs != None):
return self.regs
# Collect the names of all registers to read.
self.regs = list (pending_frame.architecture ()
.register_names ())
return self.regs
def __call__ (self, pending_frame):
"""Actually performs the unwind, or at least sniffs this frame
to see if the unwinder should claim it, which is never does."""
try:
for r in (self.get_regs (pending_frame)):
v = pending_frame.read_register (r).cast (self.void_ptr_t)
except:
print ("Dummy unwinder, exception")
raise
return None
# Register the ComRV stack unwinder.
gdb.unwinder.register_unwinder (None, dummy_unwinder (), True)
print ("Python script imported")
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