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#-------------------------------------------------------------------------------
# elftools: dwarf/aranges.py
#
# DWARF aranges section decoding (.debug_aranges)
#
# Dorothy Chen (dorothchen@gmail.com)
# This code is in the public domain
#-------------------------------------------------------------------------------
import os
from collections import namedtuple
from ..common.utils import struct_parse
from bisect import bisect_right
import math
# An entry in the aranges table;
# begin_addr: The beginning address in the CU
# length: The length of the address range in this entry
# info_offset: The CU's offset into .debug_info
# see 6.1.2 in DWARF4 docs for explanation of the remaining fields
ARangeEntry = namedtuple('ARangeEntry',
'begin_addr length info_offset unit_length version address_size segment_size')
class ARanges(object):
""" ARanges table in DWARF
stream, size:
A stream holding the .debug_aranges section, and its size
structs:
A DWARFStructs instance for parsing the data
"""
def __init__(self, stream, size, structs):
self.stream = stream
self.size = size
self.structs = structs
# Get entries of aranges table in the form of ARangeEntry tuples
self.entries = self._get_entries()
# Sort entries by the beginning address
self.entries.sort(key=lambda entry: entry.begin_addr)
# Create list of keys (first addresses) for better searching
self.keys = [entry.begin_addr for entry in self.entries]
def cu_offset_at_addr(self, addr):
""" Given an address, get the offset of the CU it belongs to, where
'offset' refers to the offset in the .debug_info section.
"""
tup = self.entries[bisect_right(self.keys, addr) - 1]
if tup.begin_addr <= addr < tup.begin_addr + tup.length:
return tup.info_offset
else:
return None
#------ PRIVATE ------#
def _get_entries(self):
""" Populate self.entries with ARangeEntry tuples for each range of addresses
"""
self.stream.seek(0)
entries = []
offset = 0
# one loop == one "set" == one CU
while offset < self.size :
aranges_header = struct_parse(self.structs.Dwarf_aranges_header,
self.stream, offset)
addr_size = self._get_addr_size_struct(aranges_header["address_size"])
# No segmentation
if aranges_header["segment_size"] == 0:
# pad to nearest multiple of tuple size
tuple_size = aranges_header["address_size"] * 2
fp = self.stream.tell()
seek_to = int(math.ceil(fp/float(tuple_size)) * tuple_size)
self.stream.seek(seek_to)
# entries in this set/CU
addr = struct_parse(addr_size('addr'), self.stream)
length = struct_parse(addr_size('length'), self.stream)
while addr != 0 or length != 0:
# 'begin_addr length info_offset version address_size segment_size'
entries.append(
ARangeEntry(begin_addr=addr,
length=length,
info_offset=aranges_header["debug_info_offset"],
unit_length=aranges_header["unit_length"],
version=aranges_header["version"],
address_size=aranges_header["address_size"],
segment_size=aranges_header["segment_size"]))
addr = struct_parse(addr_size('addr'), self.stream)
length = struct_parse(addr_size('length'), self.stream)
# Segmentation exists in executable
elif aranges_header["segment_size"] != 0:
raise NotImplementedError("Segmentation not implemented")
offset = (offset
+ aranges_header.unit_length
+ self.structs.initial_length_field_size())
return entries
def _get_addr_size_struct(self, addr_header_value):
""" Given this set's header value (int) for the address size,
get the Construct representation of that size
"""
if addr_header_value == 4:
return self.structs.Dwarf_uint32
else:
assert addr_header_value == 8
return self.structs.Dwarf_uint64