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#!/usr/bin/python
import re
import sys
# from difflib import SequenceMatcher
from optparse import OptionParser
INSTRUCTION_PREFIXES = ['rep', 'repe', 'repne']
def split_instr(full_instr):
"""
Given a line of assembly language (symbolic part from objdump -d),
return (instr, operands). operands can be an empty string.
"""
assert full_instr.strip()
split = full_instr.split(None, 1)
if len(split) == 1:
return (split[0], '')
start, end = split
if start in INSTRUCTION_PREFIXES:
next, end = end.split(None, 1)
start += " " + next
return (start, end)
def relative_only(operand):
mo = re.match(r"[0-9A-Fa-f]+ (<.*)$", operand)
return mo.group(1) if mo else operand
def split_filter_instr(full_instr):
mnemonic, operands = split_instr(full_instr)
return mnemonic, relative_only(operands)
class Func(object):
def __init__(self, name, addr):
self.name = name
self.addr = addr
self.instructions = []
def push_line(self, line):
line = line.strip()
mo = re.match(r"([0-9A-Fa-f]+):[\t]([^\t]+)[\t](.+)$", line)
if not mo:
if not re.match(r"([0-9A-Fa-f]+):[\t]([^\t]+)$", line):
self.close()
return False
else:
return True
addr, bytes, symb = mo.groups()
instr = split_filter_instr(symb)
self.instructions.append(instr)
return True
def close(self):
while self.instructions and self.instructions[-1] == ('nop', ''):
del self.instructions[-1]
def dump(self, f):
f.write("%s %08x\n" % (self.name, self.addr))
for instr in self.instructions:
f.write("\t%s\t%s\n" % (instr[0], instr[1]))
f.write("\n")
def match_func_header(line):
line = line.strip()
mo = re.match(r"([0-9A-Fa-f]{8}) <([^>]+)>:$", line)
return None if mo is None else mo.groups()
def load_disasm(filename):
funcs = {} # name: Func()
current = None
with open(filename) as f:
for line in f:
if current:
cont = current.push_line(line)
if not cont:
current = None
else:
fh = match_func_header(line)
if fh:
current = Func(fh[1], int(fh[0], 16))
funcs[current.name] = current
else:
print >> sys.stderr, "Unused:", line.rstrip()
if current:
current.close()
return funcs
def dump_disasm(filename, funcs):
func_names = funcs.keys()
func_names.sort()
with open(filename, "w") as f:
for name in func_names:
funcs[name].dump(f)
def main():
parser = OptionParser(usage="usage: %prog [options] file.disasm")
(options, args) = parser.parse_args()
if len(args) != 1:
parser.print_help()
sys.exit(1)
filename = args[0]
funcs = load_disasm(filename)
# now we are trying to be extramely lazy:
# just dump the damn files sorted and stripped, so we can try
# do diff them externally
dump_disasm(filename + ".dump", funcs)
if __name__ == '__main__':
main()
# PS: i like "extramely"
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