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#!/usr/bin/env python3
import argparse
import subprocess
def find_offset(file, name):
nm = subprocess.Popen(['nm', file], stdout=subprocess.PIPE,
encoding='utf-8')
for entry in nm.stdout.readlines():
split = entry.split(sep=' ')
symbol = split[2].rstrip('\n')
if symbol == name:
return split[0]
return
# This program takes two arguments, first the path to the input file, then the
# path to the output file. The input file is a live patch description template,
# where every line starting with '#' contains a local (not-exported) variable
# whose address in the target library (__TARGET_OFFSET__), as well as the
# address of its reference in the live patch (__PATCH_OFFSET__) must be
# determined.
parser = argparse.ArgumentParser()
parser.add_argument('ifile')
parser.add_argument('ofile')
args = parser.parse_args()
ifile = open(args.ifile, 'r')
ofile = open(args.ofile, 'w')
# The path to the patch file is always at the first line
patch = ifile.readline()
patch = patch.rstrip('\n')
# The path to the target library is always at the second line,
# which always starts with '@'
target = ifile.readline()
target = target.rstrip('\n')
target = target.rstrip('.json')
target = target.lstrip('@')
# Rewind the input file
ifile.seek(0)
# Iterate over all lines of the input file
for line in ifile:
# Lines starting with '#' contain local variables
if line[0] == '#':
# If there is a % then it is a TLS variable.
if line[1] == '%':
split = line.lstrip('#%')
else:
split = line.lstrip('#')
# Parse the line
split = split.split(':')
# Get the name of the local variable in the target library
tname = split[0]
# Get the name of the local variable reference in the live patch
pname = split[1]
# Search for the local variable in the target library
toff = find_offset(target, tname)
# Search for the local variable reference in the live patch
poff = find_offset(patch, pname)
# Replace offset template patterns with actual offsets
if toff is not None:
line = line.replace('__TARGET_OFFSET__', toff)
if poff is not None:
line = line.replace('__PATCH_OFFSET__', poff)
# Write every line back to the output file
ofile.write(line)
ifile.close()
ofile.close()
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