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Added support for DWARF v5. #854

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Added support for DWARF v5. #854

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54 changes: 42 additions & 12 deletions volatility/dwarf.py
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Expand Up @@ -50,6 +50,7 @@ class DWARFParser(object):
'unsigned int': 'unsigned int',
'sizetype' : 'unsigned long',
'ssizetype' : 'long',
'__int128 unsigned': 'unsigned long long',
}


Expand Down Expand Up @@ -261,24 +262,46 @@ def process_statement(self, kind, level, data, statement_id):

elif kind == 'DW_TAG_member' and parent_kind == 'DW_TAG_structure_type':
name = data.get('DW_AT_name', "__unnamed_%s" % statement_id).strip('"')
try:
off = int(data['DW_AT_data_member_location'].split()[1])
except:
if 'DW_AT_data_member_location' in data:
d = data['DW_AT_data_member_location']
idx = d.find("(")

if idx != -1:
d = d[:idx]

off = int(d)
else:
if 'DW_AT_data_bit_offset' in data:
d = data['DW_AT_data_bit_offset']
idx = d.find("(")

if idx != -1:
d = d[:idx]

off = int(d)/8
else:
raise AttributeError("Missing either DW_AT_data_member_location or DW_AT_data_bit_offset in profile for field {0} of type {1}".format(name, parent_name))

if 'DW_AT_bit_size' in data and ('DW_AT_bit_offset' in data or 'DW_AT_data_bit_offset' in data):
if 'DW_AT_bit_offset' in data:
stbit = int(data['DW_AT_bit_offset'], self.base)
else:
d = data['DW_AT_data_bit_offset']
idx = d.find("(")

if idx != -1:
d = d[:idx]

stbit = int(d)%8

if 'DW_AT_bit_size' in data and 'DW_AT_bit_offset' in data:
full_size = int(data['DW_AT_byte_size'], self.base) * 8
stbit = int(data['DW_AT_bit_offset'], self.base)
edbit = stbit + int(data['DW_AT_bit_size'], self.base)
stbit = full_size - stbit
edbit = full_size - edbit
stbit, edbit = edbit, stbit

if 'DW_AT_byte_size' in data:
full_size = int(data['DW_AT_byte_size'], self.base) * 8
stbit = full_size - stbit
edbit = full_size - edbit
stbit, edbit = edbit, stbit

assert stbit < edbit
memb_tp = ['BitField', dict(start_bit = stbit, end_bit = edbit)]
else:
Expand Down Expand Up @@ -325,9 +348,16 @@ def process_variable(self, data):
"""Process a local variable."""
if ('DW_AT_name' in data and 'DW_AT_decl_line' in data and
'DW_AT_type' in data):
self.local_vars.append(
(data['DW_AT_name'], int(data['DW_AT_decl_line'], self.base),
data['DW_AT_decl_file'].split()[1], data['DW_AT_type']))
declfile = data['DW_AT_decl_file'].split()
if len(declfile) > 1:
self.local_vars.append(
(data['DW_AT_name'], int(data['DW_AT_decl_line'], self.base),
data['DW_AT_decl_file'].split()[1], data['DW_AT_type']))
else:
self.local_vars.append(
(data['DW_AT_name'], int(data['DW_AT_decl_line'], self.base),
"<unknown>", data['DW_AT_type']))


def finalize(self):
"""Finalize the output."""
Expand Down