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# Copyright 2021 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Helpers that interact with the "readelf" tool."""
import re
import subprocess
import path_util
def BuildIdFromElf(elf_path):
"""Returns the Build ID for the given binary."""
args = [path_util.GetReadElfPath(), '-n', elf_path]
stdout = subprocess.check_output(args, encoding='ascii')
match = re.search(r'Build ID: (\w+)', stdout)
assert match, 'Build ID not found from running: ' + ' '.join(args)
return match.group(1)
def ArchFromElf(elf_path):
"""Returns the GN architecture for the given binary."""
args = [path_util.GetReadElfPath(), '-h', elf_path]
stdout = subprocess.check_output(args, encoding='ascii')
machine = re.search(r'Machine:\s*(.+)', stdout).group(1)
if machine == 'Intel 80386':
return 'x86'
if machine == 'Advanced Micro Devices X86-64':
return 'x64'
if machine == 'ARM':
return 'arm'
if machine == 'AArch64':
return 'arm64'
return machine
def SectionInfoFromElf(elf_path):
"""Finds the address and size of all ELF sections
Returns:
A dict of section_name->(start_address, size).
"""
args = [path_util.GetReadElfPath(), '-S', '--wide', elf_path]
stdout = subprocess.check_output(args, encoding='ascii')
section_ranges = {}
# Matches [ 2] .hash HASH 00000000006681f0 0001f0 003154 04 A 3 0 8
for match in re.finditer(r'\[[\s\d]+\] (\..*)$', stdout, re.MULTILINE):
items = match.group(1).split()
section_ranges[items[0]] = (int(items[2], 16), int(items[4], 16))
return section_ranges
def CollectRelocationAddresses(elf_path):
"""Returns the list of addresses that are targets for relative relocations."""
cmd = [path_util.GetReadElfPath(), '--relocs', elf_path]
ret = subprocess.check_output(cmd, encoding='ascii').splitlines()
# Grab first column from (sample output) '02de6d5c 00000017 R_ARM_RELATIVE'
return [int(l.split(maxsplit=1)[0], 16) for l in ret if 'R_ARM_RELATIVE' in l]
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