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#-------------------------------------------------------------------------------
# elftools example: elf_relocations.py
#
# An example of obtaining a relocation section from an ELF file and examining
# the relocation entries it contains.
#
# Eli Bendersky (eliben@gmail.com)
# This code is in the public domain
#-------------------------------------------------------------------------------
from __future__ import print_function
import sys
# If elftools is not installed, maybe we're running from the root or examples
# dir of the source distribution
try:
import elftools
except ImportError:
sys.path.extend(['.', '..'])
from elftools.common.py3compat import bytes2str
from elftools.elf.elffile import ELFFile
from elftools.elf.relocation import RelocationSection
def process_file(filename):
print('Processing file:', filename)
with open(filename, 'rb') as f:
elffile = ELFFile(f)
# Read the .rela.dyn section from the file, by explicitly asking
# ELFFile for this section
# Recall that section names are bytes objects
reladyn_name = b'.rela.dyn'
reladyn = elffile.get_section_by_name(reladyn_name)
if not isinstance(reladyn, RelocationSection):
print(' The file has no %s section' % bytes2str(reladyn_name))
print(' %s section with %s relocations' % (
bytes2str(reladyn_name), reladyn.num_relocations()))
for reloc in reladyn.iter_relocations():
print(' Relocation (%s)' % 'RELA' if reloc.is_RELA() else 'REL')
# Relocation entry attributes are available through item lookup
print(' offset = %s' % reloc['r_offset'])
if __name__ == '__main__':
for filename in sys.argv[1:]:
process_file(filename)
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